Researchers are confirming statements by Chinese officials that a 24-year-old Chinese man who died late last year of bird flu spread the virus to his father in a rare human-to-human transmission. "In this family cluster of confirmed cases of infection with highly pathogenic avian influenza A (H5N1) virus in mainland China, we believe that the index case transmitted H5N1 virus to his father while his father cared for him in the hospital," the researchers wrote in The Lancet.

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