While lots of people mention the connection between cats and toxoplasmosis, it's actually more likely for you to get it from eating undercooked meat than from your cats. It comes out in their feces, and you would need to eat the feces to get infected; so while it can happen if you clean the litter box and don't wash your hands afterwards, it's not all that likely.
It is also carried by chickens and pigs, so if you eat undercooked pork or chicken, that could be a risk factor.
Cats use the litterbox and then lick their paws, as well as the rest of their body. If you pet your cat and then absent-mindedly eat something (like I've done all too often, unfortunately), you may become infected.
Throwaway for obvious reasons, but this would actually explain a lot. Oh god...
Anything that touches the cat's litter or butt might be infected. I.e. you'd have to keep the cat off your furniture, especially eating or food preparation areas -- every time. You'd have to not ever put your face on something that the cat might have snuggled against, or walked on. It's just not feasible.
It is also carried by chickens and pigs, so if you eat undercooked pork or chicken, that could be a risk factor.