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Trypanosomes in spit samples 16–21 days after infection. A. Mixture of trypomastigotes with epimastigote (arrowed). B. Epimastigote with long posterior (arrowed). C. Epimastigote (2K1N). D. Metacyclics from day 21; contrast the size of metacyclics with the other trypomastigotes from the proboscis shown in panel A at the same scale. Bar = 10 μm.
