The commonly reported 58.6% fatality rate related to infection from highly pathogenic avian influenza strain H5N1 could be much lower, according to new research that examined blood samples from more than 12,000 people across three continents and found infection in 1%-2% of the sample, none of whom died. Current testing for those areas that have high bird-human interaction, where transmission is most likely, has a high false-positive rate and isn't sensitive enough to detect relatively asymptomatic cases of infection, according to researchers.

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