In 2005, we assessed the seroprevalence of neutralizing antibodies to avian infl uenza virus A (H5N1) among 901 residents of 4 villages in Thailand where at least 1 confi rmed human case of infl uenza (H5N1) had occurred during 2004. Although 68.1% of survey participants (median age 40 years) were exposed to backyard poultry and 25.7% were exposed to sick or dead chickens, all participants were seronegative for infl uenza virus (H5N1).
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