The presence of trypanosomes in the ecto-peritrophic space of tsetse flies, half an hour after ingestion of the infective blood meal.
D000818:Animals; D004064:Digestive System; D004435:Eating; D006168:Guinea Pigs; D013997:Time Factors; D014345:Trypanosoma / Q000302:isolation & purification*; D014370:Tsetse Flies