Gancz Ady Y, Barker Ian K, Lindsay Robbin, Dibernardo Antonia, McKeever Katherine, Hunter Bruce
University of Guelph, Guelph, Ontario, Canada.
Emerg Infect Dis. 2004 Dec;10(12):2135-42. doi: 10.3201/eid1012.040167.
From July to September 2002, an outbreak of West Nile virus (WNV) caused a high number of deaths in captive owls at the Owl Foundation, Vineland, Ontario, Canada. Peak death rates occurred in mid-August, and the epidemiologic curve resembled that of corvids in the surrounding Niagara region. The outbreak occurred in the midst of a louse fly (Icosta americana, family Hippoboscidae) infestation. Of the flies tested, 16 (88.9 %) of 18 contained WNV RNA. Species with northern native breeding range and birds >1 year of age were at significantly higher risk for WNV-related deaths. Species with northern native breeding range and of medium-to-large body size were at significantly higher risk for exposure to WNV. Taxonomic relations (at the subfamily level) did not significantly affect exposure to WNV or WNV-related deaths. Northern native breeding range and medium-to-large body size were associated with earlier death within the outbreak period. Of the survivors, 69 (75.8 %) of 91 were seropositive for WNV.
2002年7月至9月，西尼罗河病毒（WNV）疫情在加拿大安大略省维尼尔兰市猫头鹰基金会的圈养猫头鹰中导致大量死亡。8月中旬出现死亡高峰，流行病学曲线与周边尼亚加拉地区鸦科鸟类的曲线相似。此次疫情发生在虱蝇（美洲伊科斯塔虱蝇，虱蝇科）大量滋生期间。在检测的蝇类中，18只中有16只（88.9%）含有WNV RNA。具有北方本土繁殖范围且年龄大于1岁的鸟类因WNV相关死亡的风险显著更高。具有北方本土繁殖范围且体型为中大型的鸟类接触WNV的风险显著更高。分类关系（在亚科水平）对接触WNV或WNV相关死亡没有显著影响。北方本土繁殖范围和中大型体型与疫情期间较早死亡有关。在幸存者中，91只中有69只（75.8%）WNV血清呈阳性。
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