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The US farmworker who caught bird flu from cows may be the first case of mammal-to-human transmission. His case also shows how difficult it is to track the infection.
A US farmworker who caught bird flu after working with dairy cattle in Texas appears to be the first known case of mammal-to-human transmission of the virus, a new study shows.
A US farmworker who caught bird flu after working with dairy cattle in Texas appears to be the first known case of mammal-to-human transmission of the virus, a new study shows. Read More Breaking News, Latest News and Videos | CNN