I was surprised to see your (outdated) belief that cats transmit _Toxoplasma gondii_ directly to other hosts. An in-depth review of the biological cycle of this protozoan will reveal that it is NEVER, EVER transmitted directly from cats to ANY host species. The oocyst that is excreted in cat feces is IMMATURE and therefore CANNOT infect any host species at all. The IMMATURE oocyst MUST spend at least 24 hours in the environment with the proper humidity and temperature for maturation in order to become infective for another host. The oocyst cannot mature in cat fur and cats are always cleaning themselves. Ingestion of an immature oocyst by a cat or any other animal, including humans will be destroyed by stomach acid. This was established in the 1960's.
The primo-infection of a cat will result in an abundance of immature oocysts in the cat feces for about 1 week. The second infection will result in an excretion of oocysts in the feces for a couple of days. The third infection, the cat is immune and will not excrete again unless it becomes immunocompromised (FIV infection, from which the cat dies). So, a cat only excretes oocysts for a couple of weeks at most in its entire life, if it is ever infected.
That is why the litter box must be cleaned every day, preferably not by a pregnant, seronegative woman. Nothing at all needs to be done to the cat during this period.