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Human infections with influenza H5N1 virus: How many?

The lethality of avian influenza H5N1 infections in humans has been a matter of extensive debate. The >50% case fatality rate established by WHO is high, but the lethality of the virus might be lower if there are many infections accompanied by mild or no disease. One way to answer this question is to determine how many individuals carry antibodies to the virus in populations that are at risk for infection. A number of such studies have been done, and some have concluded that the results imply a low but substantial level of infection (even less than one percent of millions of people is a lot of infections). The conclusion of a new meta-analysis of H5N1 serosurveys is that most of the studies are flawed, and that the frequency of H5 infections appears to be low.
 
 

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