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A version of H5N1, known as D1.1, was confirmed in Nevada cattle on Friday. It was detected in milk collected as part of a surveillance program launched in December. The D1.1 variant was linked to the first U.S. death tied to bird flu. At least 67 people in the U.S. have been infected with bird flu, mostly those who work closely with dairy or cattle, according to the U.S. Centers for Disease Control and Prevention.
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