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Infectious diseases can spill over from animals to humans as well as spill back. Each cross-species transmission gives pathogens a chance to evolve and spread even further.
The monkeypox virus can easily spread between humans and animals. A veterinary virologist explains how the virus could go from people to wild animals in the US – and why that could be a problem.
Scientists have been testing captive and wild animals for the coronavirus since the pandemic began. Only a few wild species are known to carry the virus, but many more have been shown to be susceptible.


