Humans are susceptible to few of the estimated 260,000 to more than 1.6 million animal viruses that exist in nature, but changes in the human-animal interface increase the chances for zoonosis, and experts warn that humans can also transmit viruses to animals. "Any time viruses have the potential to mix and mingle with others, it can cause serious issues, especially when they can jump between animals and people in either direction," said veterinarian Casey Barton Behravesh, director of the CDC's One Health Office.
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