It is important your cat has a yearly fecal test for the health of your animal and yourself. For anyone who has a pet, there is an increased risk of zoonotic disease. Zoonotic diseases are those which can be passed between humans and animals, and one common route of exposure is through animal feces.
Some common intestinal parasites can infect humans through exposure to animals such as roundworms, tapeworms (not as common), hookworms, giardia and toxoplasmosis. Most parasites need an intermediate host, but many are transmitted by the fecal-oral route.
Practicing good hygiene is one of the best ways to miminize your risk of contracting any of these parasites. Wash hands thoroughly with warm soap and water after handling litter boxes. Clean the litter box with hot water and a mild soap weekly.
All kittens should be dewormed at least three times, but many adults require regular deworming as well. Cats who go outside and/or hunt regularly are at a particularly high risk of becoming infected with intestinal parasites. These cats often require quarterly deworming.