Bruce's Classification of Pathogenic African Trypanosomes | |||||||
Form | Cytoplasm | Micro- nucleus |
Undulating Membrane |
Movement | Development in Tse-Tse |
Susceptible animals | |
A. Trypanosoma Brucei Group, including T. Brucei—T. Gambiensi T. Evansi T. Equiperdum |
Polymorphic including short and stumpy forms |
Contains dark- staining granules |
Small and as a rule, at some distance from posterior end |
Well developed and in bold folds |
Active | Completed in salivary glands |
Many species of mammals |
B. Trypanosoma Pecorum Group, including T. Pecorum T. Simiæ |
Mono- morphic and small |
Non- granular |
Prominent and sub- terminal |
Well developed |
Active | Completed in pro- boscis and hypo- pharynx. Never found in salivary glands |
Cattle—very fatal to pigs |
C. Trypanosoma Vivaz Group, including T. Vivax T. Capræ T. Uniformi |
Mono- morphic |
Non- granular |
Large and terminal |
Little development and simple |
Very rapid | Completed in pro- boscis and hypo- pharynx. Never found in salivary glands |
Affects only horse, cattle, goats and sheep. Ordinary laboratory animals immune |
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