Which of the following is a common source of Toxoplasma gondii?

• A. Cat feces
• B. Pork
• C. Lamb
• D. Beef

Answer: (A)

Cats are the definitive hosts for Toxoplasma gondii and shed infectious oocysts in their feces. These oocysts are highly resistant and can persist for long periods in soil, water, and on surfaces. Humans usually become infected by ingesting these oocysts—through contact with contaminated soil or cat litter and then touching the mouth, or by eating unwashed produce that has contact with contaminated soil. While undercooked meat can also transmit the parasite via tissue cysts (not oocysts) in pork or lamb, exposure to cat feces is a more common everyday source of infection. Practicing good hygiene with soil and litter, washing produce, and cooking meat properly helps reduce risk.