A healthy cat is a harmless cat but humans can be susceptible to some ailments that are spread by sick cats.  These illness are called zoonotic diseases because they jump across species.  Cat Scratch fever, is the most common disease that is spread from cats to humans. A scratch or bite from a sick cat can cause flu like symptoms. Salmonella may be spread to humans through kitty litter.  Rabies is the most dangerous of all zoonotic diseases. This is why it is very important to have your cat vaccinated.  Common sense hygiene and continuous kitty litter cleaning will spare cat owners from most threats.  Remember you’re far more likely to catch a disease from another person than from a cat. Keeping your cat indoors and in  a clean environment will help your cat stay healthy. Clean your kitty litter regularly and keep up with shots and regular checkups.