What Is Spillover? How Animal Viruses Infect Humans

Workers prepare ducks at a market in Phnom Penh, Cambodia, on February 24, 2023. Two people in Cambodia were confirmed to have been infected with H5N1 bird flu, but it appears to have been a result of exposure to infected birds or poultry. (Photo by TANG CHHIN SOTHY/AFP via Getty Images) Spillover is likely happening […]

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