Baumer Anette, Feldmann Julia, Renzullo Sandra, Müller Matthias, Thür Barbara, Hofmann Martin A
Institute of Virology and Immunoprophylaxis, Sensemattstrasse 293, CH-3147 Mittelhäusern, Switzerland.
Avian Dis. 2010 Jun;54(2):875-84. doi: 10.1637/9119-110209-Reg.1.
After the spread of H5N1 highly pathogenic avian influenza virus (AIV) from Asia into Russia, the Middle East, Europe, and Africa in 2005-06, the Swiss national AIV surveillance program was extended. One of the new focal points was Lake Constance, where sentinel duck stations and swim-in traps were established within the project Constanze in collaboration with Germany and Austria. More than 2000 samples from 41 species were collected in Switzerland between September 2006 and December 2008. Approximately 4% were AIV-positive by quantitative reverse transcriptase-PCR. Subsequent typing revealed 13 different AIV subtypes, of which H5N2 and H9N2 were the most prevalent. All H7 isolates and all but one H5 isolate were characterized as low pathogenic; however, a highly pathogenic H5N1 AIV was detected in a healthy pochard. This study demonstrates that a wide selection of different AIV subtypes can cocirculate among the waterfowl population in wild bird habitats.
2005 - 2006年H5N1高致病性禽流感病毒（AIV）从亚洲传播到俄罗斯、中东、欧洲和非洲后，瑞士国家禽流感监测计划得到了扩展。新的重点之一是康斯坦茨湖，在该地区与德国和奥地利合作开展的“康斯坦茨”项目中设立了哨兵鸭监测站和诱捕陷阱。2006年9月至2008年12月期间，在瑞士采集了来自41个物种的2000多个样本。通过定量逆转录聚合酶链反应，约4%的样本呈AIV阳性。随后的分型显示有13种不同的AIV亚型，其中H5N2和H9N2最为普遍。所有H7分离株以及除一株H5分离株外的所有H5分离株均被鉴定为低致病性；然而，在一只健康的潜鸭中检测到了高致病性H5N1 AIV。这项研究表明，多种不同的AIV亚型可以在野生鸟类栖息地的水禽种群中共同传播。
