Animals should not be fed raw meat or bones and should not be allowed to scavenge through the garbage. Since T. gondii can be found in unpasteurized goat s milk, pets should not be allowed to drink it. Cats that can roam free outside can become infected through hunting prey such as mice and birds, so it is best to keep cats indoors. Clean the litter boxes regularly with boiling or scalding water. Dogs should not be allowed access to litter boxes.
Humans can become infected either in utero, or by accidental ingestion of the oocysts.
If T. gondii passes through the uterus of an infected pregnant woman to her fetus early in the pregnancy, spontaneous abortion is common. Most infected pregnant women do not have symptoms. People infected through ingestion of oocysts may be listless and have fever, enlarged lymph nodes and less commonly, inflammation of the heart. I've heard all kinds of stories about how people can get toxoplasmosis. Neither people who own cats nor veterinarians have a significantly higher risk of being infected with T. gondii than the rest of the population.