Crazy cat ladies are undoubtedly infected with the parasite.
There needs to be more public awareness about this. Change your cat's litter-box daily, wash your hands after touching a cat (kittens specifically), be very cautious of outdoor cats, never handle a cat while pregnant or if you have a compromised immune system. Also wash vegetables and cook meat thoroughly.
Even more shocking is the percentage of the human population that is infected, over 30%!