Zoonotic diseases, also called zoonoses, are illnesses caused by germs that are passed between animals and people.
"Put simply, a zoonotic disease is one that originates in animals and can cause disease in humans," said Barbara Han, a disease ecologist at the Cary Institute of Ecosystem Studies in New York.
Zoonotic diseases are prevalent throughout the world; they can be caused by viruses, bacteria, parasites or fungi, and may cause mild or severe illness or death. Experts estimate that about 60% of known infectious diseases in people can be spread by animals, and 3 out of every 4 new diseases in people originated in animals, according to the Centers for Disease Control and Prevention (CDC).
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