A parasitic infection transmitted to humans by cats affects billions of people and can alter their behavior. New research ...

It causes symptoms ... risks to humans, including the risk of spreading disease. Cats in particular can carry a parasite known as Toxoplasma gondii. This is one of the most common parasites ...

Bites from cat fleas have caused some dermatitis (skin irritation) in humans. Symptoms of dermatitis ... risk of developing flea-related illnesses. Tapeworms (parasites developed from fleas ...

But, for most people, it is latent and lacks clinical symptoms. It might still affect human behavior in important ways. The infection is caused by a brain parasite transmitted by cats. The ...