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Zero-COVID, also known as COVID-Zero and "Find, Test, Trace, Isolate and Support" (FTTIS), is a public health policy that has been implemented by some countries during the COVID-19 pandemic.^[1]^[a] In contrast to the living with COVID-19 strategy, the zero-COVID strategy is a "control and maximum suppression" strategy.^[1] It involves using public health measures such as contact tracing, mass testing, border quarantine, lockdowns, and mitigation software in order to stop community transmission of COVID-19 as soon as it is detected. The goal of the strategy is to get the area back to zero new infections and resume normal economic and social activities.^[1]^[3]

A zero-COVID strategy consists of two phases: an initial suppression phase in which the virus is eliminated locally using aggressive public health measures, and a sustained containment phase, in which normal economic and social activities resume and public health measures are used to contain new outbreaks before they spread widely.^[3] This strategy has been utilized to varying degrees by Australia, Atlantic and Northern Canada,^[4] mainland China, Hong Kong,^[5] Macau,^[6] New Zealand, Singapore, Scotland,^[7] South Korea,^[8] Taiwan,^[9] Tonga,^[10] and Vietnam.^[11]^[12] In late 2021, due to challenges with the increased transmissibility of the Delta variant and Omicron variant, and also the arrival of COVID-19 vaccines, most countries stopped pursuing zero-COVID. As of April 2022, mainland China ^[13] and North Korea^[14] are still pursuing a zero-COVID strategy.

Experts differentiate between zero-COVID, which is an elimination strategy, and mitigation strategies that attempt to lessen the effects of the virus on society, but which still tolerate some level of transmission within the community.^[15]^[3] These initial strategies can be pursued sequentially or simultaneously during the acquired immunity phase through natural and vaccine-induced immunity.^[16]

Advocates of zero-COVID have pointed to the far lower death rates and higher economic growth in countries that have pursued elimination, compared with countries that have pursued mitigation,^[15] and argue that swift, strict measures to eliminate the virus allow a faster return to normal life.^[15] Opponents of zero-COVID argue that "it's not realistic to eliminate a respiratory virus such as SARS-CoV-2, any more than it is to eliminate the flu or the common cold."^[17] To achieve zero-COVID in an area with high infection rates, one review estimated that it would take three months of strict lockdown.^[18]

Elimination vs. mitigation

Epidemiologists differentiate between two broad strategies for responding to the COVID-19 pandemic: mitigation and elimination.^[3]^[19]^[20] Mitigation strategies (also commonly known as "flattening the curve") aim to reduce the growth of an epidemic and to prevent the healthcare system from becoming overburdened, yet still accept a level of ongoing viral transmission within the community.^[3] By contrast, elimination strategies (commonly known as "zero-COVID") aim to completely stop the spread of the virus within the community in order to allow the resumption of normal social and economic activity.^[3] In comparison with mitigation strategies, elimination involves stricter short-term measures to completely eliminate the virus, followed by milder long-term measures to prevent a return of the virus.^[3]^[19]

After elimination of COVID-19 from a region, zero-COVID strategies require stricter border controls in order to prevent reintroduction of the virus, more rapid identification of new outbreaks and better contact tracing to end new outbreaks.^[19] Advocates of zero-COVID argue that the costs of these measures are lower than the economic and social costs of long-term social distancing measures and increased mortality incurred by mitigation strategies.^[19]^[3]

The long-term "exit path" for both elimination and mitigation strategies depends on the development of effective vaccines and treatments for COVID-19.^[19]^[3]

Containment measures

The zero-COVID approach aims to prevent viral transmission, using a number of different measures, including vaccination and non-pharmaceutical interventions such as contact-tracing and quarantine. Successful containment or suppression reduces the basic reproduction number of the virus below the critical threshold.^[20] Different combinations of measures are used during the initial containment phase, when the virus is first eliminated from a region, and the sustained containment phase, when the goal is to prevent reestablishment of viral transmission within the community.^[21]

Lockdowns

Lockdowns encompass measures such as closure of non-essential businesses, stay-at-home orders and movement restrictions.^[21] During lockdowns, governments must often supply basic necessities to households.^[21]^[3] Lockdown measures are commonly used to achieve initial containment of the virus.^[21] In China, lockdowns of specific high-risk communities are also sometimes used to suppress new outbreaks.^[3]

Quarantine for travelers

In order to prevent reintroduction of the virus into zero-COVID regions after initial containment has been achieved, quarantine for incoming travelers is commonly used. As each infected traveler could seed a new outbreak, the goal of travel quarantine is to intercept as large a percentage of infected travelers as possible.^[21]^[22]

International flights to China are heavily restricted, and incoming travelers are required to undergo PCR testing and quarantine in designated hotels and facilities.^[23] In order to facilitate quarantine for travelers, China has constructed specialized facilities at its busiest ports of entry, including Guangzhou and Xiamen.^[21] New Zealand and Australia have also established managed isolation and quarantine facilities for incoming travelers.^[22]

Through November 2020, border quarantine measures prevented nearly 4,000 infected international travelers from entering the wider community within China.^[24] Each month, hundreds of travelers who test negative before flying to China subsequently test positive while undergoing quarantine after arrival.^[21]

Contact tracing, quarantine, and isolation

Contact-tracing involves identifying people who have been exposed to an infected person (AKA "come into close contact with" that person). Public health workers then attempt to locate all of those exposed persons, and quarantine them until they either are unlikely to be infectious or receive several negative tests. This is in addition to isolating the known infected person. Various studies have argued that early detection and isolation of infected people is the single most effective measure for preventing transmission of SARS-CoV-2.^[21]^[3] "Quarantine" refers to the separation of exposed persons who could possibly be infected from the rest of society, while "isolation" refers to the separation of persons who are known to be infected.^[25]

In China, when an infected person is identified, all close contacts are required to undergo a 14-day quarantine with multiple rounds of PCR testing.^[24] In order to minimize the risk that these close contacts pose for outbreak containment, China has implemented quarantine in centralized facilities for those deemed to be at the highest-risk of infection.^[21] Secondary close contacts (contacts of close contacts) are sometimes required to quarantine at home.^[21]

The widespread use of smartphones has enabled more rapid "digital" contact tracing. In China, "health code" applications are used to facilitate the identification of close contacts, via analysis of bluetooth logs which show proximity between devices.^[3] Taiwan has also made use of digital contact tracing, notably to locate close contacts of passengers who disembarked from the Diamond Princess cruise ship, the site of an early outbreak in February 2020.^[26]

Routine testing of key populations

In China, routine PCR testing is carried out on all patients who present with fever or respiratory symptoms.^[24] In addition, various categories of workers, such as medical staff and workers who handle imported goods, are regularly tested.^[24]

In China, routine testing of key populations has identified index patients in a number of outbreaks, including outbreaks in Beijing, Shanghai, Dalian, Qingdao, and Manchuria.^[21] In some cases, index patients have been discovered while asymptomatic, limiting the amount of onward transmission into the community.^[21]

Community-wide screening

An additional tool for identifying cases outside of known transmission chains is community-wide screening, in which populations of specific neighborhoods or cities are PCR tested. In China, community-wide PCR testing is carried out during outbreaks in order to identify infected people, including those without symptoms or known contact with infected people.^[24] Community-wide screening is intended to rapidly isolate infected people from the general population, and to allow a quicker return to normal economic activity.^[24] China first carried out community-wide screening from 14 May to 1 June 2020 in Wuhan, and has used this technique in subsequent outbreaks.^[24] In outbreaks in June 2020 in Beijing and July 2020 in Dalian, community screening identified 26% and 22% of infections, respectively.^[21] In order to test large populations quickly, China commonly uses pooled testing, combining 5 to 10 samples before testing, and retesting all individuals in each batch that tests positive.^[21]

Zero-COVID implementation by region

Australia

The first confirmed case in Australia was identified on 25 January 2020, in Victoria, when a man who had returned from Wuhan, Hubei Province, China, tested positive for the virus.^[27] A human biosecurity emergency was declared on 18 March 2020. Australian borders were closed to all non-residents on 20 March,^[28] and returning residents were required to spend two weeks in supervised quarantine hotels from 27 March.^[29] Many individual states and territories also closed their borders to varying degrees, with some remaining closed until late 2020,^[30] and continuing to periodically close during localised outbreaks.^[31]

Social distancing rules were introduced on 21 March, and state governments started to close "non-essential" services.^[32]^[33] "Non-essential services" included social gathering venues such as pubs and clubs but unlike many other countries did not include most business operations such as construction, manufacturing and many retail categories.^[34]

During the second wave of May and June 2020, Victoria underwent a second strict lockdown with the use of helicopters and the Army to help the police enforce the "zero Covid" lockdown in Sydney.^[35]^[36] The wave ended with zero new cases being recorded on 26 October 2020.^[37]^[38]^[39] Distinctive aspects of that response included early interventions to reduce reflected transmission from countries other than China during late January and February 2020; early recruitment of a large contact tracing workforce;^[40] comparatively high public trust in government responses to the pandemic, at least compared to the US;^[41] and later on, the use of short, intense lockdowns to facilitate exhaustive contact tracing of new outbreaks.^[42]^[43] Australia's international borders also remained largely closed, with limited numbers of strictly controlled arrivals, for the duration of the pandemic.^[44] Australia sought to develop a Bluetooth-based contact tracing app that does not use the privacy-preserving Exposure Notification framework supported natively by Android and Apple smartphones, and while these efforts were not particularly effective,^[45]^[46]^[47] QR code-based contact tracing apps became ubiquitous in Australia's businesses.^[48]^[49]^[50]

Due to the transmissibility of the Delta variant, which led to a major outbreak in New South Wales, the federal government and certain states of Australia outlined plans to phase out the zero-COVID strategy in August 2021, once the country reached a threshold of vaccination in the population.^[51]

Canada

The virus was confirmed to have reached Canada on January 27, 2020, after an individual who had returned to Toronto from Wuhan, Hubei, China, tested positive. The first case of community transmission in Canada was confirmed in British Columbia on March 5.^[52] In March 2020, as cases of community transmission were confirmed, all of Canada's provinces and territories declared states of emergency. Provinces and territories have, to varying degrees, implemented prohibitions on gatherings, closures of non-essential businesses and restrictions on entry with Atlantic Canada and the three Canadian Territories adopting a COVID-Zero approach.^[53] On June 24, 2020, it was announced that the four Atlantic provinces: New Brunswick, Prince Edward Island, Nova Scotia, and Newfoundland and Labrador had come to an agreement of creating a free-travel bubble while maintaining low case numbers inside, effective July 3, 2020.^[54]^[55] In late November 2020, mounting cases lead to the disbandment of the Atlantic Bubble,^[56] with each of the Atlantic provinces maintaining their own travel restrictions and Zero-COVID policies after the bubble burst.^[57] Throughout 2020 and 2021 infection rates and deaths in the Atlantic provinces remained low, especially compared to the more populated areas of the Canada which did not implement COVID-Zero.^[53] The appearance of the Delta and Omicron Variants lead to the successive abandonment of COVID-Zero in Atlantic Canada at the end of 2021.^[57]

China

China was the first country to experience the COVID-19 pandemic. The first cluster of pneumonia patients was discovered in late December 2019 in Wuhan, Hubei Province, and a public notice on the outbreak was distributed on 31 December 2019.^[59]

On 23 January 2020, the Chinese government banned travel to and from Wuhan, and began implementing strict lockdowns in Wuhan and other cities throughout China.^[59] These measures suppressed transmission of the virus below the critical threshold, bringing the basic reproduction number of the virus to near zero.^[59] On 4 February 2020, around two weeks after the beginning of the lockdowns in Hubei province, case counts peaked in the province and began to decline thereafter.^[59] The outbreak remained largely concentrated within Hubei province, with over 80% of cases nationwide through 22 March 2020 occurring there.^[23]

The death toll in China during the initial outbreak was approximately 4,600 according to official figures (equivalent to 3.2 deaths per million population),^[60] and has been estimated at under 5,000 by a scientific study of excess pneumonia mortality published in The BMJ.^[61]

As the epidemic receded, the focus shifted towards restarting economic activity and preventing a resurgence of the virus.^[62] Low- and medium-risk areas of the country began to ease social distancing measures on 17 February 2020.^[62] Reopening was accompanied by an increase in testing and the development of electronic "health codes" (using smartphone applications) to facilitate contact tracing.^[62] Health code applications contain personalized risk information, based on recent contacts and test results.^[62] Wuhan, the last major city to reopen, ended its lockdown on 8 April 2020.^[63]

China reported its first imported COVID-19 case from an incoming traveler on 30 January 2020.^[62] As the number of imported cases rose and the number of domestic cases fell, China began imposing restrictions on entry into the country.^[62] Inbound flights were restricted, and all incoming passengers were required to undergo quarantine.^[62]

After the containment of the initial outbreak in Wuhan, the Chinese Center for Disease Control and Prevention (China CDC) argued, "The successful containment effort builds confidence in China, based on experience and knowledge gained, that future waves of COVID-19 can be stopped, if not prevented. Case identification and management, coupled with identification and quarantine of close contacts, is a strategy that works."^[3] The China CDC rejected a mitigation strategy, and instead explained that "[t]he current strategic goal is to maintain no or minimal indigenous transmission of SARS-CoV-2 until the population is protected through immunisation with safe and effective COVID-19 vaccines, at which time the risk of COVID-19 from any source should be at a minimum. This strategy buys time for urgent development of vaccines and treatments in an environment with little ongoing morbidity and mortality."^[3]

Since the end of the initial outbreak in Wuhan, there have been additional, smaller outbreaks caused by imported cases, which have been controlled through short-term, localized intense public health measures.^[63] From July through August 2021, China experienced and contained 11 outbreaks of the Delta variant, with a total of 1,390 detected cases (out of a population of 1.4 billion in mainland China).^[64] The largest of these outbreaks, in both geographic extent and in the number of people infected, began in Nanjing.^[64] The index case of the outbreak, an airport worker, tested positive on 20 July 2021, and the outbreak was traced back to an infected passenger on a flight from Moscow that had arrived on 10 July.^[64] The outbreak spread to multiple provinces before it was contained, with a total of 1,162 detected infections.^[64] China has made use of mass testing to control several outbreaks. For example, nearly the entire population of the city of Guangzhou - approximately 18 million residents - were tested over the course of three days in June 2021, during a Delta variant outbreak.^[65]

Since Mid-February 2022 China has faced an unprecedented Omicron Wave with daily cases reaching in the thousands, which are levels not seen since the pandemic started two years ago.^[66] Similar Zero-COVID measures were deployed in some areas with lockdowns in Shenzhen,^[67] Shenyang^[68] and Jilin.^[68] Other areas such as Shanghai had previously adopted a less strict approach avoiding wholesale lockdowns,^[69]^[70] only to issue a snap lockdown in late March due to rapidly rising case counts.^[71] Since April, most areas of Shanghai have instituted "area-separated control" since April 1.^[72] This is widely considered to be the largest lockdown event in China since Hubei in early 2020.^[73] These measures have seen some rare pushback from residents over the overzealousness of the implementation and the perceived lack of benefit.^[74]^[75]^[76]^[77]^[78]

Hong Kong

The virus was first confirmed to have spread to Hong Kong on 23 January 2020.^[79] On 5 February, after a five-day strike by front-line medical workers, the Hong Kong government closed all but three border control points – Hong Kong International Airport, Shenzhen Bay Control Point, and Hong Kong–Zhuhai–Macau Bridge Control Point remaining open. Hong Kong was relatively unscathed by the first wave of the COVID-19 outbreak. Some experts believe the habit of wearing masks in public since the SARS epidemic of 2003 may have helped keep its confirmed infections rates low.^[80] In a study published in April 2020 in the Lancet, the authors expressed their belief that border restrictions, quarantine and isolation, social distancing, and behavioural changes likely all played a part in the containment of the disease up to the end of March.^[81]

After a much smaller second wave in late March and April 2020,^[82] Hong Kong saw a substantial uptick in COVID cases in July.^[83] Experts attributed this third wave to imported cases – sea crew, aircrew members, and domestic helpers made up the majority of 3rd wave infections.;^[83] Measures taken in response included a suspension of school classroom teaching until the end of the year, and an order for restaurants to seat only two persons per table and close at 10:00 p.m. taking effect on 2 December;^[84] a further tightening of restrictions saw, among other measures, a 6pm closing time of restaurants starting from 10 December, and a mandate for authorities to order partial lockdowns in locations with multiple cases of COVID-19 until all residents were tested.^[85] From late January 2021, the government repeatedly locked down residential buildings to conduct mass testings. A free mass vaccination program with the Sinovac vaccine and Pfizer–BioNTech vaccine was launched on 26 February. The government sought to counter the vaccine hesitancy by material incentives, which led to an acceleration of vaccinations in June.^[86] From early 2022, to prevent the spread of the Omicron variant, Hong Kong had been placed under tightened alert until the day it became 70% fully inoculated.^[87] Nonetheless, earlier focus and messaging about eliminating all cases had weakened the case for getting vaccinated in the first place, with less than one-quarter of people aged 80 or older having received two doses of a vaccine before Omicron surged.^[88]

By mid-February 2022, the Omicron variant had caused the largest outbreak to date in the territory; authorities modified their eradication protocols, but continued to pursue containment.^[89] By mid-March, the virus spread rapidly in the densely populated city, and researchers at University of Hong Kong estimated that almost half the population was infected at one point since the start of the outbreak, compared to only 1 percent of the population before the surge.^[88]^[90] Daily new cases peaked to over 70,000 by March, a far cry from the single digit daily case loads from Hong Kong's successful implementation of Zero-COVID. Total deaths increased from around 200 over the two years of the pandemic^[91] to exceeding 7,000 in a span of a few weeks, leading Hong Kong’s Covid-19 deaths per capita, once far lower than those of Western nations, to become the highest in the world during March.^[90] The massive deathtoll and high infection rates while maintaining strict eradication protocols led to the calls for authorities to review Hong Kong's Zero COVID strategy, as well as questioning the sustainability of such an approach with the Omicron variant.^[92]^[93]

New Zealand

New Zealand reported its first case of COVID-19 on 28 February 2020.^[94] From 19 March, entry into New Zealand was limited to citizens and residents,^[95] and the country began quarantining new arrivals in converted hotels on 10 April.^[96]

On 21 March, a four-tier alert level system was introduced, and most of the country was placed under lockdown from 25 March.^[97] Due to the success of the elimination strategy, restrictions were progressively lifted between 28 April and 8 June, when the country moved to the lowest alert level, and the last restrictions (other than quarantine for travelers) were removed.^[98]^[99]^[100]^[101]^[102]

After the lifting of restrictions, New Zealand went for 102 days without any community transmission.^[103] On 11 August 2020, four members of a single family in Auckland tested positive for SARS-CoV-2, prompting a city-wide lockdown, and lesser restrictions throughout New Zealand.^[103] Additional cases related to this cluster of infections were identified over the following weeks. On 21 September, after a week without any new cases of community transmission, restrictions were dropped to the lowest level outside of Auckland. Restrictions in Auckland were eased somewhat two days later,^[104] and moved to the lowest level on 7 October.^[105]

Additional small outbreaks led to temporary restrictions in parts of New Zealand in February, March, and June 2021.^[106]

The country moved to a nationwide lockdown on 17 August 2021, after the detection of one new local case outside of quarantine in Auckland.^[107] Over the following weeks, Auckland remained under lockdown as cases rose, while the most of the rest of the country progressively eased restrictions.^[106] On 4 October 2021, the government of New Zealand announced that it was transitioning away from its zero-COVID strategy, arguing that the Delta variant made elimination infeasible.^[108]

Macau

Macau, like Mainland China and Hong Kong, has followed a Zero-COVID strategy. The territory has closed its borders to travelers who are not residents of Greater China. Despite its proximity to Mainland China, from the beginning of the pandemic through March 11, 2022, the territory confirmed only 82 total infections and not a single death.^[109]

Montserrat

The British territory and Caribbean island of Montserrat has used a COVID-zero strategy, using testing and quarantine on inbound travelers to prevent localized outbreaks. It has suffered just 175 cases and two deaths.^[110] From December 31, 2021, Montserrat suffered its first major outbreak, with 67 locally transmitted infections and one death.^[111] On March 1, 2022, the ministry of health declared the outbreak to be over, having gone 31 days without a locally transmitted case.^[112] As of April 2022, Montserrat is still using an elimination strategy to prevent the spread of COVID-19 on the island.

North Korea

North Korea also reportedly follows an "elimination strategy."^[113]

North Korea was one of the first countries to close borders due to COVID-19.^[114]^[115] Starting from 23 January 2020, North Korea banned foreign tourists, and all flights in and out of the country were halted. The authorities also started placing patients with suspected COVID, including those with slight, flu-like symptoms, in quarantine for two weeks in Sinuiju.^[116]^[117]^[118] On 30 January, the state news agency of North Korea, the Korean Central News Agency (KCNA), declared a "state emergency", and reported the establishment of anti-epidemic headquarters around the country.^[119] Though many parts of the border were closed, the bridge between Dandong and Sinuiju remained open and allowed supplies to be delivered.^[120] In late February, the North Korean government said that it would keep the border closed until a cure was found.^[121]

On 2 February, KCNA reported that all the people who had entered the country after 13 January were placed under "medical supervision".^[119] South Korean media outlet Daily NK reported that five suspected COVID-19 patients in Sinuiju, on the Chinese border, had died on 7 February.^[122] The same day, The Korea Times reported that a North Korean female living in the capital Pyongyang was infected.^[123] Although there was no confirmation by North Korean authorities of the claims, the country implemented further strict measures to combat the spread of the virus.^[124]^[125] Schools were closed starting on 20 February.^[126] On 29 February, Supreme Leader Kim Jong Un called for stronger measures to be taken to prevent COVID-19 from spreading within North Korea.^[127]

In early February, the North Korean government took severe measures to block the spread of COVID-19. Rodong Sinmun, the Workers' Party of Korea newspaper, reported that the customs officials at the port of Nampo were performing disinfection activities, including placing imported goods in quarantine.^[128] All international flights and railway services were suspended in early February, and connections by sea and road were largely closed over the following weeks.^[121] In February, wearing face masks was obligatory, and visiting public places such as restaurants was forbidden. Ski resorts and spas were closed, and military parades, marathons, and other public events were cancelled.^[121] Schools were closed throughout the country; university students in Pyongyang from elsewhere in the country were confined to their dormitories.^[129]^[126]

Although South Korean media reported the epidemic had spread to North Korea, the WHO said there were no indications of cases there.^[130] On 18 February, Rodong Sinmun, the official newspaper of North Korea's ruling party, quoted a public health official reiterating that there had been "no confirmed case of the new coronavirus so far". The WHO prioritised aid for North Korea, including the shipment of protective equipment and supplies.^[131]

On 25 July, Kim Jong Un attended an emergency meeting after a suspected COVID-19 case was reported in the city of Kaesong. Kim declared a state of emergency and imposed a lockdown on the city.^[132]^[133] The suspected case was reported to be an individual who had defected to South Korea three years earlier, before swimming back to North Korea in July (a rare case of "re-defection"). According to a South Korean senior health official, the individual was neither registered as a COVID-19 patient, nor classified as someone who came in contact with other patients. Two close contacts of the defector in South Korea tested negative for the virus.^[134] On 5 August, Salvador said the returning defector was tested but the "results were inconclusive".^[135] On 14 August, the three week lockdown in Kaesong and nearby areas was lifted by Kim Jong Un,^[136] after "the scientific verification and guarantee by a professional anti-epidemic organisation".^[137]

Scotland and Northern Ireland

Scotland, led by its devolved government, pursued an "elimination" COVID-19 strategy starting from April 2020.^[138] The Scottish government's approach diverged with that of the central British government in April 2020, after a UK-wide lockdown began being lifted. Scotland pursued a slower approach to lifting the lockdown than other nations of the UK, and expanded a "test and trace" system.^[138] Although Northern Ireland also pursued the strategy^[7]^[139] and Scottish First Minister Nicola Sturgeon advocated for the approach to be adopted by the whole of the UK,^[139] the central British government pursued a different mitigation strategy that applied to England, with commentators noting that this combined with an open Anglo-Scottish border could undermine Scotland's attempts at elimination.^[140]^[7]^[141]

Singapore

Singapore recorded its first COVID-19 case on 23 January 2020.^[142] With that, many Singaporeans had purchased and worn masks when not at home; practiced social distancing and on 7 February 2020, Singapore raised the Disease Outbreak Response System Condition (DORSCON) level from Yellow to Orange in response to additional local cases of uncertain origin.^[143] On 3 April 2020 a stringent set of preventive measures collectively called the "circuit breaker lockdown" was announced.^[144] Stay-at-home order and cordon sanitaire were implemented as a preventive measure by the Government of Singapore in response on 7 April 2020. The measures were brought into legal effect by the Minister for Health with the COVID-19 (Temporary Measures) (Control Order) Regulations 2020, published on 7 April 2020.^[145]

The country introduced what was considered one of the world's largest and best-organised epidemic control programmes.^[146]^[147] The "Control Order" implemented various measures such as; mass testing the population for the virus, isolating any infected people as well as introducing contact tracing apps and strictly quarantining those they had close contact with those infected All non-essential workplaces closed, with essential workplaces remaining open. All schools transitioned to home-based learning. All food establishments were only allowed to offer take-away, drive-thru and delivery of food. Non-essential advertising at shopping centres are not allowed to be shown or advertised and only advertising from essential service offers and safe management measures such as mask wearing and social distancing are allowed.^[148]

These measures helped to prevent these lockdowns after the end of the circuit breaker lockdown measures in June 2020 with reopening being staggered in different steps all the way until April 2021.^[149]^[150] The transmissibility of the Delta and Omicron variants since May 2021 as the next contagion, prompted Singapore to phase out the zero-COVID strategy. In addition, Singapore had two more lockdowns. It was phased out after vaccinating the majority of its population in October 2021.^[151]

South Korea

The first case in South Korea was announced on 20 January 2020.^[152] On 4 February 2020, in order to help prevent spread of the disease, South Korea began denying entry to foreigners traveling from China.^[153]^[154] Various other measures have been taken: mass testing the population, isolating infected people, and trace and quarantine of those they had contact with.^[155]^[156] The rapid and extensive testing undertaken by South Korea has been judged successful in limiting the spread of the outbreak, without using drastic measures.^[155]^[157]^[158] There was no general lockdown of businesses in South Korea, with supermarkets and other retailers remaining open. However, schools, universities, cinemas, and gyms were closed soon after the outbreaks, with schools and universities having online classes.^[159]

The government is providing citizens with information in Korean, English, Chinese, and Japanese on how to not become infected and how to prevent spreading the disease as part of its "K-Quarantine" measures. This includes information on cough etiquette, when and how to wear a face mask, and the importance of physical distancing and staying at home.^[159] The South Korean government has also been sending daily emergency notifications, detailing information on locations with reported infections and other status updates related to the pandemic.^[160] Infected South Koreans are required to go into isolation in government shelters. Their phones and credit card data are used to trace their prior movements and find their contacts. People who are determined to have been near the infected individual receive phone alerts with information about their prior movements.^[161]

Taiwan

Due to its extensive cultural and economic exchanges with mainland China, Taiwan was initially expected to be at high risk of developing a large-scale outbreak of COVID-19.^[162]^[163]

Immediately after China notified the WHO of a pneumonia cluster in Wuhan on 31 December 2019, Taiwanese officials began screening passengers arriving from Wuhan for fever and pneumonia.^[163] This screening was subsequently broadened to all passengers with respiratory symptoms who had recently visited Wuhan.^[163] Beginning in early February 2020, all passengers arriving from mainland China, Hong Kong or Macau were required to quarantine at home for 14 days after arrival in Taiwan.^[26] Mobile phone data was used to monitor compliance with quarantine requirements.^[163]

Public places such as schools, restaurants and offices in Taiwan were required to monitor body temperature of visitors and provide hand sanitizer.^[164] Mask-wearing was encouraged, and on 24 January, an export ban and price controls were placed on surgical masks and other types of personal protective equipment.^[164]

On 20 March 2020, Taiwan initiated 14-day quarantine for all international arrivals, and began converting commercial hotels into quarantine facilities.^[165] In early April, Taiwanese public health officials announced social distancing measures, and mandated mask use in public transport.^[26]

The first known case of COVID-19 in Taiwan was identified on 21 January 2020.^[164] On 31 January, approximately 3,000 passengers from the Diamond Princess cruise ship went ashore in Taiwan. Five days later, it was recognized that there was an outbreak on the ship.^[166] Taiwanese public health authorities used mobile phone data and other contact tracing measures to identify these passengers and their close contacts for testing and quarantine.^[166] No cases related to these passengers were identified in Taiwan.^[166]

Taiwan maintained near-zero viral prevalence throughout 2020, totaling just 56 known locally transmitted cases (out of a population of 23.6 million) through 31 December 2020.^[162]

Taiwan experienced its largest outbreak from April to August 2021, initially caused by violations of COVID-19 quarantine rules by international flight crews.^[167]^[168] On 15 May 2021, Taiwan identified more than 100 daily cases for the first time since the start of the pandemic.^[169] The outbreak was brought to an end on 25 August 2021, when Taiwan recorded no new locally transmitted cases for the first time since May 2021.^[170]

As of April 2022, the Taiwanese government under Tsai Ing-wen has not publicly stated it is abandoning Zero-COVID,^[171]^[172] but it has not instituted harsher restrictions amid a recent rise in cases.^[171]

Tonga

Tonga has followed a Zero-COVID policy, but more than a year and a half into the pandemic, on October 29, 2021, the first COVID-19 case—a seasonal worker who returned from New Zealand and entered quarantine—was confirmed. The country's COVID-19 policy caused complications with international aid following the Hunga Tonga volcano eruption in 2022.^[173] To keep the country virus-free, an Australian aid flight had to return to base after detecting a case midflight, while HMAS Adelaide (L01) made plans to stay at sea after 23 members of her crew tested positive for COVID-19.^[174]

Vietnam

The virus was first confirmed to have spread to Vietnam on 23 January 2020, when two Chinese people in Ho Chi Minh City tested positive for the virus.^[175]^[176] In response the government issued a diagnostic and management guidelines for COVID-19, providing instructions on contact tracing and 14-day isolation.^[12] Health authorities began monitoring body temperatures at border gates and started detection and contact tracing, with orders for the mandatory isolation of infected people and anyone they had come into contact with.^[177]

In 2020, Vietnam was cited by global media as having one of the best-organized epidemic control programs in the world,^[178]^[179]^[180] along the lines of other highlights such as Taiwan and South Korea.^[181] This success has been attributed to several factors, including a well-developed public health system, a decisive central government, and a proactive containment strategy based on comprehensive testing, tracing, and quarantining.^[11] Howerver, instead of relying on medicine and technology, the Vietnamese state security apparatus has adopted an widespread of public surveillance system along with a public well-respected military force.^[182]^[183]

Starting in April 2021, Vietnam experienced its largest outbreak to date, with over 1.2 million infections recorded by November.^[184] This led to two of its largest cities (Ho Chi Minh City and Hanoi) and around a third of the country's population coming under some form of lockdown by late July.^[185] A degree of complacency after successes in previous outbreaks, and infections originating from foreign workers were all considered to have contributed to the outbreak. In response, government-mandated quarantine for foreign arrivals and close contacts to confirmed cases was extended to 21 days, and accompanying safety measures also tightened up.^[186]

In September 2021, Vietnam abandoned its zero-COVID strategy, after a three-month lockdown of Ho Chi Minh city caused major economic disruption in the city and failed to contain the outbreak. The country shifted to a phased reopening and more flexible approach while expanding its vaccination programme.^[187]^[188]

Reception

Support

Proponents of the zero-COVID strategy argue that successful execution reduces the number of nationwide lockdowns needed,^[189] that healthcare and economic costs are lower,^[190]^[191] that it is less costly to society,^[192] that it reduces dependence on pharmaceutical interventions such as vaccines,^[193] and that it increases quality of life and life expectancy due to fewer citizens contracting COVID-19.^[194]

Opposition

Chinese virologist Guan Yi has criticised the Chinese government's zero COVID measures, telling Phoenix Hong Kong Channel that, if the government persists with the policy for a handful of cases, the economy will suffer. Guan has advocated for increased vaccination and research into the efficacy of homegrown vaccines against new variants.^[195]

Other opponents of the zero-COVID strategy argue that the strategy causes the economy to suffer,^[196] that before vaccinations were common, elimination strategies lowered herd immunity,^[197] that zero-COVID is not sustainable,^[198] and that newer variants such as the Omicron variant are so transmissible that the zero-COVID strategy is no longer feasible.^[199]

Some countries which pursued zero-COVID, such as Vietnam, Singapore, and Australia, later decided to discontinue it.^[197]

Notes

^ Chinese: 动态清零; pinyin: Dòngtài qīng líng; lit. 'Dynamic Clearing'^[2]

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External links

EndCoronavirus.org - List of "zero-COVID" advocacy groups

[3] Chinese: 动态清零; pinyin: Dòngtài qīng líng; lit. 'Dynamic Clearing'^[2]

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[189] Reuters (2021-09-03). "Ho Chi Minh City could lift lockdown, end 'zero COVID-19' policy". Reuters. Retrieved 2022-01-06. {{cite news}}: |last= has generic name (help)

[190] "Devi Sridhar: The UK needs a zero-Covid strategy to prevent endless lockdowns". New Statesman. 2021-01-08. Retrieved 2022-01-11.

[191] Grafton, R. Quentin; Parslow, John; Kompas, Tom; Glass, Kathryn; Banks, Emily; Lokuge, Kamalini (2020-09-02). "Health and Economic Effects of COVID-19 control in Australia: Modelling and quantifying the payoffs of 'hard' versus 'soft' lockdown": 2020.08.31.20185587. doi:10.1101/2020.08.31.20185587. S2CID 221406941. {{cite journal}}: Cite journal requires |journal= (help)

[BMJ-Tang-Abbasi-2021-192] Tang, Jin-Ling; Abbasi, Kamran (2 December 2021). "What can the world learn from China's response to covid-19?". The BMJ. 375: n2806. doi:10.1136/bmj.n2806. PMID 34853017. S2CID 244775638.

[SCMP-2Nov20212-193] Lau, Jack (2 November 2021). "Zero Covid still less costly than living with it, China's top expert Zhong Nanshan says". South China Morning Post. Retrieved 6 January 2022.

[194] Stamatov, Petar (4 January 2022). "Ще разобличи ли Омикрон лицемерието на властимащите по света?". eurochicago.com (in Bulgarian). Retrieved 14 January 2022.

[195] Raychev, Aleksandar (interviewer) (1 December 2021). "Георги Маринов: Няма такова нещо като самоунищожаващ се вирус". bnr.bg (in Bulgarian). Retrieved 8 January 2022. {{cite web}}: |author= has generic name (help)

[Bloomberg_2021-196] "Chinese Virus Expert Launches Scathing Attack on Covid Zero Push". Bloomberg. 2021-11-10. Retrieved 2022-01-07.

[197] "Focus - A closer look at China's strict 'zero-Covid' policy". France 24. January 5, 2022.

[auto1-198] "Asian countries are at last abandoning zero-covid strategies". The Economist. October 9, 2021.

[199] "Why has Australia switched tack on Covid zero?". BBC News. September 3, 2021.

[200] "Atlantic Canada's vaunted COVID-Zero strategy no match for Omicron variant | Globalnews.ca". Global News.

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@@ Line 6: / Line 6: @@
 Isolate and Support” (FTTIS)''"</ref>{{efn|{{Lang-zh|t=动态清零|p=Dòngtài qīng líng|l=Dynamic Clearing}}<ref>{{Cite web |date=2022-04-28 |title=上海封城一个月：官方坚持"动态清零"政策不变 如何解除危机 |url=https://www.bbc.com/zhongwen/simp/chinese-news-61242081 |access-date=2022-04-28 |website=BBC News 中文 |language=zh-hans}}</ref>}} In contrast to the [[living with COVID-19]] strategy, the zero-COVID strategy is a "control and maximum suppression" strategy.<ref name=Barcelona /> It involves using public health measures such as [[contact tracing]], [[COVID-19 testing|mass testing]], [[Travel during the COVID-19 pandemic|border quarantine]], [[COVID-19 lockdowns|lockdowns]], and [[Use and development of software for COVID-19 pandemic mitigation|mitigation software]] in order to stop [[Transmission of COVID-19|community transmission]] of [[COVID-19]] as soon as it is detected. The goal of the strategy is to get the area back to zero new infections and resume normal economic and social activities.<ref name=Barcelona /><ref name="Lancet-Li-2020">{{cite journal |journal=The Lancet |title=Active case finding with case management: the key to tackling the COVID-19 pandemic |doi=10.1016/S0140-6736(20)31278-2 |date=4 June 2020 |volume=396 |issue=10243 |pages=63–70 |first1=Zhongjie |last1=Li |first2=Qiulan |last2=Chen |first3=Luzhao |last3=Feng |first4=Lance |last4=Rodewald |first5=Yinyin |last5=Xia |first6=Hailiang |last6=Yu |first7=Ruochen |last7=Zhang |first8=Zhijie |last8=An |first9=Wenwu |last9=Yin |first10=Wei |last10=Chen |first11=Ying |last11=Qin |first12=Zhibin |last12=Peng |first13=Ting |last13=Zhang |first14=Daxin |last14=Ni |first15=Jinzhao |last15=Cui |first16=Qing |last16=Wang |first17=Xiaokun |last17=Yang |first18=Muli |last18=Zhang |first19=Xiang |last19=Ren |first20=Dan |last20=Wu |first21=Xiaojin |last21=Sun |first22=Yuanqiu |last22=Li |first23=Lei |last23=Zhou |first24=Xiaopeng |last24=Qi |first25=Tie |last25=Song |first26=George F |last26=Gao |first27=Zijian |last27=Feng|pmid=32505220 |pmc=7272157 }}</ref>
-A zero-COVID strategy consists of two phases: an initial suppression phase in which the virus is eliminated locally using aggressive public health measures, and a sustained containment phase, in which normal economic and social activities resume and public health measures are used to contain new outbreaks before they spread widely.<ref name="Lancet-Li-2020"/> This strategy has been utilized to varying degrees by [[COVID-19 pandemic in Australia|Australia]], [[COVID-19 pandemic in Canada|Atlantic and Northern Canada]],<ref name="CTV-1May2021">{{cite news |url=https://atlantic.ctvnews.ca/the-covid-zero-approach-why-atlantic-canada-excels-at-slowing-the-spread-of-covid-19-1.5410217 |title=The COVID-Zero approach: Why Atlantic Canada excels at slowing the spread of COVID-19 |publisher=CTV News |first=Michael |last=MacDonald |date=1 May 2021 |accessdate=5 January 2022}}</ref> mainland [[Chinese government response to COVID-19|China]], [[COVID-19 pandemic in Hong Kong|Hong Kong]],<ref>{{cite news|title=Hong Kong is clinging to 'zero covid' and extreme quarantine. Talent is leaving in droves.|url=https://www.washingtonpost.com/world/2021/12/27/covid-hong-kong-quarantine-omicron/|access-date=2022-01-05|newspaper=The Washington Post}}</ref> [[COVID-19 pandemic in Macau|Macau]],<ref name="Social Transformations in Chinese Societies">{{cite news |last1=Lou|first1=Loretta|url=https://www.emerald.com/insight/content/doi/10.1108/STICS-09-2020-0025/full/html |title=Casino capitalism in the era of COVID-19: examining Macau's pandemic response |journal=[[Social Transformations in Chinese Societies]] |date=2021-03-26 |volume=17|issue=2|pages=69–79|doi=10.1108/STICS-09-2020-0025|access-date=2021-03-26 |url-status=live }}</ref> [[COVID-19 pandemic in New Zealand|New Zealand]], [[COVID-19 pandemic in Singapore|Singapore]], [[COVID-19 pandemic in Scotland|Scotland]],<ref name=":3">{{Cite magazine|title=Scotland is aiming to eliminate coronavirus. Why isn't England?|magazine=Wired UK|url=https://www.wired.co.uk/article/zero-covid-coronavirus-elimination|access-date=2022-01-11|issn=1357-0978}}</ref> [[COVID-19 pandemic in South Korea|South Korea]],<ref>{{cite web|last=McLaughlin|first=Timothy|date=2021-06-21|title=The Countries Stuck in Coronavirus Purgatory|url=https://www.theatlantic.com/international/archive/2021/06/covid19-zero-asia-hong-kong-quarantine/619231/|access-date=2022-01-06|website=The Atlantic}}</ref> [[COVID-19 pandemic in Taiwan|Taiwan]],<ref name="Hale">{{cite web|last=Hale|first=Erin|title=After early success, Taiwan struggles to exit 'zero COVID' policy|url=https://www.aljazeera.com/economy/2021/11/26/after-early-success-taiwan-struggles-to-exit-zero-covid-model|url-status=live|archive-url=https://web.archive.org/web/20220101201538/https://www.aljazeera.com/economy/2021/11/26/after-early-success-taiwan-struggles-to-exit-zero-covid-model|archive-date=2022-01-01|access-date=2022-01-02|website=Al Jazeera}}</ref> [[Tonga]],<ref name="auto">{{Cite news|last=Fildes|first=Nic|date=2022-01-18|title=Tonga volcano relief effort complicated by 'Covid-free' policy|work=Financial Times|url=https://www.ft.com/content/352efc20-e176-49f8-944d-e7c8f18b98b1|access-date=2022-01-18}}</ref> and [[Vietnamese government response to the COVID-19 pandemic|Vietnam]].<ref name="ourworldindata" /><ref name=":2" /> As of late 2021, due to challenges with the increased transmissibility of the [[Delta variant]] and [[SARS-CoV-2 Omicron variant|Omicron variant]], and also the arrival of [[COVID-19 vaccine]]s, some countries are no longer pursuing zero-COVID. As of April 2022, mainland China <ref name="Normile2021">{{cite journal | last1 = Normile | first1 = Dennis | title = 'Zero COVID' is getting harder—but China is sticking with it | journal = Science | date = 19 November 2021 | volume = 374 | issue = 6570 | page = 924 | issn = 0036-8075 | eissn = 1095-9203 | doi = 10.1126/science.acx9657 | pmid = 34793217 | bibcode = 2021Sci...374..924N | s2cid = 244403712 | url = }}</ref> and North Korea<ref>{{Cite web|url=https://www.csis.org/analysis/north-koreas-covid-19-lockdown-current-status-and-road-ahead|title=North Korea's Covid-19 Lockdown: Current Status and Road Ahead}}</ref> are still pursuing a zero-COVID strategy.
+A zero-COVID strategy consists of two phases: an initial suppression phase in which the virus is eliminated locally using aggressive public health measures, and a sustained containment phase, in which normal economic and social activities resume and public health measures are used to contain new outbreaks before they spread widely.<ref name="Lancet-Li-2020"/> This strategy has been utilized to varying degrees by [[COVID-19 pandemic in Australia|Australia]], [[COVID-19 pandemic in Canada|Atlantic and Northern Canada]],<ref name="CTV-1May2021">{{cite news |url=https://atlantic.ctvnews.ca/the-covid-zero-approach-why-atlantic-canada-excels-at-slowing-the-spread-of-covid-19-1.5410217 |title=The COVID-Zero approach: Why Atlantic Canada excels at slowing the spread of COVID-19 |publisher=CTV News |first=Michael |last=MacDonald |date=1 May 2021 |accessdate=5 January 2022}}</ref> mainland [[Chinese government response to COVID-19|China]], [[COVID-19 pandemic in Hong Kong|Hong Kong]],<ref>{{cite news|title=Hong Kong is clinging to 'zero covid' and extreme quarantine. Talent is leaving in droves.|url=https://www.washingtonpost.com/world/2021/12/27/covid-hong-kong-quarantine-omicron/|access-date=2022-01-05|newspaper=The Washington Post}}</ref> [[COVID-19 pandemic in Macau|Macau]],<ref name="Social Transformations in Chinese Societies">{{cite news |last1=Lou|first1=Loretta|url=https://www.emerald.com/insight/content/doi/10.1108/STICS-09-2020-0025/full/html |title=Casino capitalism in the era of COVID-19: examining Macau's pandemic response |journal=[[Social Transformations in Chinese Societies]] |date=2021-03-26 |volume=17|issue=2|pages=69–79|doi=10.1108/STICS-09-2020-0025|access-date=2021-03-26 |url-status=live }}</ref> [[COVID-19 pandemic in New Zealand|New Zealand]], [[COVID-19 pandemic in Singapore|Singapore]], [[COVID-19 pandemic in Scotland|Scotland]],<ref name=":3">{{Cite magazine|title=Scotland is aiming to eliminate coronavirus. Why isn't England?|magazine=Wired UK|url=https://www.wired.co.uk/article/zero-covid-coronavirus-elimination|access-date=2022-01-11|issn=1357-0978}}</ref> [[COVID-19 pandemic in South Korea|South Korea]],<ref>{{cite web|last=McLaughlin|first=Timothy|date=2021-06-21|title=The Countries Stuck in Coronavirus Purgatory|url=https://www.theatlantic.com/international/archive/2021/06/covid19-zero-asia-hong-kong-quarantine/619231/|access-date=2022-01-06|website=The Atlantic}}</ref> [[COVID-19 pandemic in Taiwan|Taiwan]],<ref name="Hale">{{cite web|last=Hale|first=Erin|title=After early success, Taiwan struggles to exit 'zero COVID' policy|url=https://www.aljazeera.com/economy/2021/11/26/after-early-success-taiwan-struggles-to-exit-zero-covid-model|url-status=live|archive-url=https://web.archive.org/web/20220101201538/https://www.aljazeera.com/economy/2021/11/26/after-early-success-taiwan-struggles-to-exit-zero-covid-model|archive-date=2022-01-01|access-date=2022-01-02|website=Al Jazeera}}</ref> [[Tonga]],<ref name="auto">{{Cite news|last=Fildes|first=Nic|date=2022-01-18|title=Tonga volcano relief effort complicated by 'Covid-free' policy|work=Financial Times|url=https://www.ft.com/content/352efc20-e176-49f8-944d-e7c8f18b98b1|access-date=2022-01-18}}</ref> and [[Vietnamese government response to the COVID-19 pandemic|Vietnam]].<ref name="ourworldindata" /><ref name=":2" /> In late 2021, due to challenges with the increased transmissibility of the [[Delta variant]] and [[SARS-CoV-2 Omicron variant|Omicron variant]], and also the arrival of [[COVID-19 vaccine]]s, most countries stopped pursuing zero-COVID. As of April 2022, mainland China <ref name="Normile2021">{{cite journal | last1 = Normile | first1 = Dennis | title = 'Zero COVID' is getting harder—but China is sticking with it | journal = Science | date = 19 November 2021 | volume = 374 | issue = 6570 | page = 924 | issn = 0036-8075 | eissn = 1095-9203 | doi = 10.1126/science.acx9657 | pmid = 34793217 | bibcode = 2021Sci...374..924N | s2cid = 244403712 | url = }}</ref> and North Korea<ref>{{Cite web|url=https://www.csis.org/analysis/north-koreas-covid-19-lockdown-current-status-and-road-ahead|title=North Korea's Covid-19 Lockdown: Current Status and Road Ahead}}</ref> are still pursuing a zero-COVID strategy.
 Experts differentiate between zero-COVID, which is an elimination strategy, and [[Flattening the curve|mitigation strategies]] that attempt to lessen the effects of the virus on society, but which still tolerate some level of transmission within the community.<ref name="Lancet-OliuBarton-2021">{{cite journal |journal=The Lancet |title=SARS-CoV-2 elimination, not mitigation, creates best outcomes for health, the economy, and civil liberties |doi=10.1016/S0140-6736(21)00978-8 |date=28 April 2021 |pages=2234–2236 |volume=397 |issue=10291 |first1=Miquel |last1=Oliu-Barton |first2=Bary S R |last2=Pradelski |first3=Philippe |last3=Aghion |first4=Patrick |last4=Artus |first5=Ilona |last5=Kickbusch |first6=Jeffrey V |last6=Lazarus |first7=Devi |last7=Sridhar |first8=Samantha |last8=Vanderslott|pmid=33932328 |pmc=8081398 }}</ref><ref name="Lancet-Li-2020"/> These initial strategies can be pursued sequentially or simultaneously during the [[acquired immunity |acquired immunity phase]] through [[Immunity (medical)#Naturally acquired|natura]]l and [[COVID-19 vaccine|vaccine-induced immunity]].<ref name="Bhopal2020">{{cite journal | last1 = Bhopal | first1 = Raj S | title = To achieve "zero covid" we need to include the controlled, careful acquisition of population (herd) immunity | journal = BMJ | date = 9 September 2020 | volume = 370 | page = m3487 | eissn = 1756-1833 | doi = 10.1136/bmj.m3487 | pmid = 32907816 | s2cid = 221538577 | url = }}</ref>