Which protozoan is commonly found in cat litter pans?

Which protozoan is commonly found in cat litter pans?

• A. Plasmodium
• B. Entamoeba
• C. Toxoplasma
• D. Giardia

Answer: (C)

This question tests knowledge of a protozoan commonly linked to domestic cats and their litter boxes. Cats are the definitive hosts of Toxoplasma gondii, and when they are infected, they shed oocysts in their feces. These oocysts can contaminate a litter pan and become infectious after environmental sporulation. Humans can pick up toxoplasmosis by inhaling dust from litter, cleaning the box without proper hygiene, or consuming food or water contaminated with oocysts. That strong association with cats and litter boxes makes Toxoplasma gondii the best answer. Other protozoa listed are not as closely tied to cat litter pans. Plasmodium is the malaria parasite transmitted by mosquitoes, not by contact with cat litter. Entamoeba and Giardia are intestinal parasites that can be transmitted via the fecal-oral route and contaminated water, and while Giardia can infect a range of hosts, the specific household scenario of a cat litter box points to Toxoplasma gondii.

This question tests knowledge of a protozoan commonly linked to domestic cats and their litter boxes. Cats are the definitive hosts of Toxoplasma gondii, and when they are infected, they shed oocysts in their feces. These oocysts can contaminate a litter pan and become infectious after environmental sporulation. Humans can pick up toxoplasmosis by inhaling dust from litter, cleaning the box without proper hygiene, or consuming food or water contaminated with oocysts. That strong association with cats and litter boxes makes Toxoplasma gondii the best answer.

Other protozoa listed are not as closely tied to cat litter pans. Plasmodium is the malaria parasite transmitted by mosquitoes, not by contact with cat litter. Entamoeba and Giardia are intestinal parasites that can be transmitted via the fecal-oral route and contaminated water, and while Giardia can infect a range of hosts, the specific household scenario of a cat litter box points to Toxoplasma gondii.