What Happens When We Give Animals Our Diseases?

When scientists think about the movement of microbes between animal species, we generally focus on “spillover” events: when pathogens move from animals to humans. But pathogen transmission isn’t a one-way street. Humans appear to have introduced SARS-CoV-2 — the virus that causes COVID-19 —into populations of wild deer, mink, captive gorillas, pet dogs and cats, and a variety of other species.

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