What is the difference between trophozoite and cyst stages?
The life cycle of a protozoan exhibits two main stages: the trophozoite stage and the cyst stage. The trophozoite stage is the feeding stage of the protozoan whereas the cyst stage is the dormant, resistant and infectious stage of the protozoan. This is the key difference between cyst and trophozoite.
What is the trophozoite stage?
A trophozoite (G. trope, nourishment + zoon, animal) is the activated, feeding stage in the life cycle of certain protozoa such as malaria-causing Plasmodium falciparum and those of the Giardia group. (The complement of the trophozoite state is the thick-walled cyst form).
What is cyst stage?
A microbial cyst is a resting or dormant stage of a microorganism, usually a bacterium or a protist or rarely an invertebrate animal, that helps the organism to survive in unfavorable environmental conditions.
What is the difference between a trophozoite and a cyst quizlet?
Trophozoites quickly die in environment and cysts survive to infect another animal.
What is the purpose of a trophozoite and a cyst stage?
Excystation produces a trophozoite from the cyst stage, and it takes place in the large intestine of the host after the cyst has been ingested….
| Trophozoite | Cyst | |
|---|---|---|
| Diagnosis | Occasionally found in feces, often found in tissue biopsies of infected individuals | Diagnostically found in feces of infected individuals |
What are cysts and trophozoites?
Cysts are typically found in formed stool, whereas trophozoites are typically found in diarrheal stool. Infection by Entamoeba histolytica occurs by ingestion of mature cysts (2) in fecally contaminated food, water, or hands.
What causes trophozoite?
The trophozoite cannot live long outside of the body, therefore it cannot spread the infection to others. The inactive cyst, on the other hand, can exist for prolonged periods outside the body. When it is ingested, stomach acid activates the cyst, and the cyst develops into the disease-causing trophozoite.