Efforts to diagnose human cases of bird flu in Asia have been missing the mark, according to studies released last week. The findings have prompted calls for broader surveillance of the virus and a change in testing procedures, Reanalysis of samples from Vietnamese patients with flu-like symptoms has revealed that some people originally declared free of bird flu actually did carry the avian virus H5N1. And another study has shown that some patients with symptoms other than those usually associated with flu were also suffering from H5N1.
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