Abstract
Summary: A two-colour flow cytometry technique was used to assess killing ofGiardia muristrophozoites by rabbit anti-trophozoite antibodies and complement. Binding of rabbit antibody to trophozoites and killing of trophozoites were documented by flow cytometry, after incubating the organisms with fluorescein-conjugated anti-rabbit IgG and propidium iodide (PI). Percentages of PI+(dead) trophozoites ranged from >80%, after incubation with rabbit antiserum and complement, to Giardia-infected mammals can killGiardiatrophozoites.