Toxoplasmosis is spread by "Siput air " (Sorry...forgot the correct term) to the mice/mouse ,cat usually get it either by drinking contaminated water (padi field,fresh water pond,mine or drain)or eating infected mice,if your cat is indoor and eating kibbles,this should not be the problems.

Anyway if you are living/dealing with stray cat that eating mice/mouse or drinking what I call " dirty" water sources,then your cat might be infected.

I agree with other forumers,cleanliness is the main step to avoid this infestation.For me,throwing/avoiding cat during pregnancy is just an excuse....no valid reason for that.(unless you are allergic or having ASTHMA)