I don't wear a mask, but sometimes have to hold my breath
when cleaning the "pee" box. My kitties seem to chose one box for mostly pee & anothers for "other deposits". Anyway I found this explanation of the disease you were speaking of on a cat site.


WARNING
Pregnant women shouldn't change cat litter boxes because cats can be infected with a disease called toxoplasmosis. Cats can carry this disease because they hunt and eat other animals. This disease is rare in house cats but you would be better off avoiding the litter box anyway. A pregnant woman can catch the infection by touching or breathing the particles (such as dust) from cat feces. You can also get toxoplasmosis by eating raw or under cooked red meat or by touching dirt while gardening that has been contaminated by cat feces.

If a woman gets toxoplasmosis during pregnancy it can affect the developing baby and cause birth defects, particularly in eye and brain development. Therefore it is advised that women who are pregnant ask to have someone else change the cat litter box. It is safe to hold and pet your cat however, so feel free to give your pet all the affection it deserves.

Want to train your cat to use the toilet? Try this link:
Toilet Training your cat.
Or this link TOILET TRAINING CATS