With the U.S. bird flu outbreak uncontained, scientists see growing risks

Given the conditions at mass poultry facilities, it's far from surprising that people would catch the virus, says epidemiologist Jennifer Nuzzo. It's gambling with people's lives, she says. There's no other way to describe it.

Nuzzo emphasizes the risks of having a viral reservoir in dairy herds, which facilitates the transmission of bird flu to humans, creating a potential for the virus to jump between species and adapt to mammals.

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