Are ducks contributing to the endemicity of highly pathogenic H5N1 influenza virus in Asia?

文献类型： 外文期刊

第一作者： Sturm-Ramirez, KM

作者： Sturm-Ramirez, KM;Hulse-Post, DJ;Govorkova, EA;Humberd, J;Seiler, P;Puthavathana, P;Buranathai, C;Nguyen, TD;Chaisingh, A;Long, HT;Naipospos, TSP;Chen, H;Ellis, TM;Guan, Y;Peiris, JSM;Webster, RG

作者机构：

关键词： AVIAN INFLUENZA;HONG-KONG;HEMAGGLUTININ GENE;SOUTHEASTERN CHINA;A VIRUSES;POULTRY;SUBTYPE;GEESE;CIRCULATE;WATERFOWL

期刊名称：JOURNAL OF VIROLOGY （ 影响因子：5.103； 五年影响因子：5.078 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Wild waterfowl are the natural reservoir of all influenza A viruses, and these viruses are usually nonpathogenic in these birds. However, since late 2002, H5N1 outbreaks in Asia have resulted in mortality among waterfowl in recreational parks, domestic flocks, and wild migratory birds. The evolutionary stasis between influenza virus and its natural host may have been disrupted, prompting us to ask whether waterfowl are resistant to H5N1 influenza virus disease and whether they can still act as a reservoir for these viruses. To better understand the biology of H5N1 viruses in ducks and attempt to answer this question, we inoculated juvenile mallards with 23 different H5N1 influenza viruses isolated in Asia between 2003 and 2004. All virus isolates replicated efficiently in inoculated ducks, and 22 were transmitted to susceptible contacts. Viruses replicated to higher levels in the trachea than in the cloaca of both inoculated and contact birds, suggesting that the digestive tract is not the main site of H5N1 influenza virus replication in ducks and that the fecal-oral route may no longer be the main transmission path. The virus isolates' pathogenicities varied from completely nonpathogenic to highly lethal and were positively correlated with tracheal virus titers. Nevertheless, the eight virus isolates that were nonpathogenic in ducks replicated and transmitted efficiently to naive contacts, suggesting that highly pathogenic H5N1 viruses causing minimal signs of disease in ducks can propagate silently and efficiently among domestic and wild ducks in Asia and that they represent a serious threat to human and veterinary public health.

分类号： Q93

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