Toxoplasmosis can cause a variety of cancers, and should not be considered benign in adults. The higher the toxoplasmosis titer, the greater the risk. Virtually all cats acquire toxoplasmosis during their lifespan, but are most likely to acquire toxoplasmosis at a young age. Toxoplasmosis is most transmissible to humans within three weeks after the cat acquires toxoplasmosis; and can also become airborne and spread from litterboxes which are not frequently changed. Cats are the only known reservoir for toxoplasmosis, and the animal which is best known to transmit toxoplasmosis to humans.

Toxoplasmosis likely also can cause other chronic diseases, particularly autoimmune disease, schizophrenia, epilepsy, and other mental health disorders, which but are not recognized to be caused by toxoplasmosis.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6682582/ https://onlinelibrary.wiley.com/doi/10.1002/ijc.33443