Ziegler A F, Davison S, Acland H, Eckroade R J
University of Pennsylvania, School of Veterinary Medicine 19348, USA.
Avian Dis. 1999 Jan-Mar;43(1):142-9.
Between January 1997 and March 1998, 11 cases of H7N2 avian influenza (nonpathogenic) were diagnosed at the Laboratory of Avian Medicine and Pathology, Kenneth Square, PA. These cases involved either commercial leghorn laying hens or leghorn pullets raised in Pennsylvania. Grossly and histologically, the most striking lesion associated with disease was salpingitis, usually with edema and occasionally with oviduct necrosis. Fluid, fibrinous, and egg yolk material in the peritoneum (egg yolk peritonitis) as well as pulmonary congestion and pulmonary edema were also frequently seen. Oviduct lesions have rarely been described in association with avian influenza infections in previous outbreaks. Mortality in affected houses was mild to moderate (less than 4% total mortality during the outbreak), with concurrent mild to moderate egg production declines (2%-4% at the time of disease onset).
1997年1月至1998年3月期间，宾夕法尼亚州肯尼斯广场的禽医学与病理学实验室诊断出11例H7N2禽流感（非致病性）病例。这些病例涉及宾夕法尼亚州饲养的商业来航蛋鸡或来航小母鸡。大体和组织学检查发现，与该病相关的最显著病变是输卵管炎，通常伴有水肿，偶尔伴有输卵管坏死。腹腔内的液体、纤维蛋白和蛋黄物质（蛋黄性腹膜炎）以及肺充血和肺水肿也很常见。在以往的禽流感疫情中，很少有关于输卵管病变的描述。受影响鸡舍的死亡率为轻度至中度（疫情期间总死亡率低于4%），同时产蛋量出现轻度至中度下降（发病时下降2%-4%）。
