It is particularly important for pregnant women to carefully wash their hands and take other precautions if they have a pet cat and are changing the litter box.An organism occasionally carried by cats,pig,and sheep can infect humans and pass from mother to child in utero,resulting in severe symptoms in the growing child.Microscopic examination of this organism shows a nucleus and other visible cellular organelles.It obtains all its nutrients from whichever host it currently occupies and can multiply by fission.This pathogenic organism is the