Deadly bird flu strain detected in Nevada cows for first time (Video)

At least four dairy cattle herds in Nevada have tested positive for a strain of bird flu never seen before in cows. The strain, called d1.1, is also linked to the death of one person in Louisiana last month. Dr. William Schaffner, professor of preventive medicine at the Vanderbilt University School of Medicine, joined CBS News to discuss what this means.

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