The most important precaution is daily cleaning of litter boxes, since the parasite does not become infectious until after a day of being expelled from the cat through its feces.

Also, cats only spread the parasite for up to three weeks after becoming infected themselves.

This has more info about this: https://www.cdc.gov/parasites/toxoplasmosis/gen_info/faqs.ht...

Also, for anyone curious about parasites, this book is a gem: https://en.m.wikipedia.org/wiki/Parasite_Rex