Toxoplasmosis is an infection that can threaten the health of an unborn child. It's caused by a parasite called Toxoplasma gondii. The parasite multiplies in the intestine of cats and is shed in cat feces, mainly into litter boxes and garden soil. You can get the parasite by handling cat litter or soil where there are cat feces. You can also get the parasite from eating undercooked meat (such as rare beef) from animals infected with the parasite.