The protozoan that lacks a cyst stage and therefore must be transferred quickly from host to host is
A)Giardia lamblia.
B)Trichomonas vaginalis.
C)Balantidium coli.
D)Entamoeba histolytica.

Question

Quizplus · Accepted Answer

Trichomonas vaginalis is the only protozoan among the given options that lacks a cyst stage, which makes it necessary for it to be transferred quickly from host to host. The other protozoans such as Giardia lamblia, Balantidium coli, and Entamoeba histolytica have cyst stages that allow them to survive in the environment and wait for a suitable host to infect.

The Protozoan That Lacks a Cyst Stage and Therefore Must