WAN XF, Dong L, Lan Y, Long LP, et al.. Indications that Live Poultry Markets are a Major Source of Human H5N1 Influenza. J Virol. 2011
Human infections of H5N1 highly pathogenic avian influenza virus have continued to occur in China without corresponding outbreaks in poultry, and there is little conclusive evidence of the source of these infections. Seeking to identify the source of the human infections, we sequenced 31 H5N1 viruses isolated from humans in China (2005-2010). We found a number of viral genotypes, not all of which having similar known avian virus counterparts. Guided by patient questionnaire data, we also obtained environmental samples from live poultry markets and dwellings frequented by six individuals prior to disease onset (2008-2009). H5N1 viruses were isolated from 4 of the 6 live poultry markets sampled. In each case, the genetic sequence of the environmental and corresponding human isolates was highly similar, demonstrating a link between human infection and live poultry markets. Therefore, infection control measures in live poultry markets are likely to reduce human H5N1 infection in China.
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