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As bird flu spreads in cows, here are 4 big questions scientists are trying to answer

Bird flu is spreading through U.S. dairy cattle. Scientists say the risk to people is minimal, but open questions remain, including how widespread the outbreak is and how the virus is spreading. (AFP via Getty Images)
Bird flu is spreading through U.S. dairy cattle. Scientists say the risk to people is minimal, but open questions remain, including how widespread the outbreak is and how the virus is spreading. (AFP via Getty Images)

This article was originally published on April 26, 2024.

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