The presence of trypanosomes in the ectoperitrophic space of tsetse flies half-an-hour after ingestion of the infective blood meal.
D000818:Animals; D001769:Blood; D004064:Digestive System; D004435:Eating; D013997:Time Factors; D014345:Trypanosoma / Q000302:isolation & purification*; D014370:Tsetse Flies