Answer to Case 797

Answer to the Parasite Case of the Week 797: Trichomonas vaginalis trophozoites. 

Note the diagnostic features, including the small nucleus, 4 anterior flagella, an undulating membrane, and posterior axostyle.

Also, as Idzi noted, we caught one in the process of binary fission! You can see two sets of flagella and two nuclei.

Thanks again to Florida Fan for donating this classic case. Happy 2026 everyone!