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首页> 外文期刊>The American Journal of Tropical Medicine and Hygiene >West Nile virus in American White Pelican chicks: Transmission, immunity, and survival
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West Nile virus in American White Pelican chicks: Transmission, immunity, and survival

机译：美国白鹈鹕雏鸡中的西尼罗河病毒：传播，免疫和存活

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摘要

West Nile virus (WNV) causes significant mortality of American White Pelican chicks at northern plains colonies. We tested oropharyngeal/cloacal swabs from moribund chicks for shed WNV. Such shedding could enable chick-to-chick transmission and help explain why WNV spreads rapidly in colonies. WNV was detected on swabs from 11% of chicks in 2006 and 52% of chicks in 2007; however, viral titers were low. Before onset of WNV mortality, we tested blood from < 3-week-old chicks for antibodies to WNV; 5% of chicks were seropositive, suggesting passive transfer of maternal antibodies. Among near-fledged chicks, 41% tested positive for anti-WNV antibodies, indicating that they survived infection. Among years and colonies, cumulative incidence of WNV in chicks varied from 28% to 81%, whereas the proportion of chicks surviving WNV (i.e., seropositive) was 64-75%. Our data revealed that WNV kills chicks that likely would fledge in the absence of WNV, that infection of chicks is pervasive, and that significant numbers of chicks survive infection.
机译：西尼罗河病毒（WNV）在北部平原殖民地导致美国白鹈鹕雏鸡大量死亡。我们测试了垂死雏鸡的口咽/泄殖腔拭子的脱落WNV。这种脱落可能使小鸡到小鸡传播，并有助于解释为什么WNV在菌落中迅速传播。 2006年有11％的雏鸡和2007年有52％的雏鸡拭子中检测到WNV;但是，病毒滴度很低。在WNV死亡率发作之前，我们测试了<3周龄小鸡的血液中的WNV抗体; 5％的雏鸡是血清阳性的，表明母源抗体是被动转移的。在接近成熟的雏鸡中，有41％的人检测出抗WNV抗体呈阳性，表明它们在感染后仍然存活。在年和殖民地中，雏鸡中WNV的累积发生率从28％到81％不等，而幸存的WNV（即血清反应阳性）的雏鸡比例为64-75％。我们的数据显示，WNV杀死了在没有WNV的情况下可能会成年的雏鸡，这种雏鸡的感染无处不在，并且有相当数量的雏鸡幸免于感染。

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