Characteristics of H7N2 (nonpathogenic) avian influenza virus infections in commercial layers, in Pennsylvania, 1997-98

被引:47
作者
Ziegler, AF [1 ]
Davison, S [1 ]
Acland, H [1 ]
Eckroade, RJ [1 ]
机构
[1] Univ Penn, Sch Vet Med, Kennett Square, PA 19348 USA
关键词
avian influenza; H7N2; oviduct; chicken; layer;
D O I
10.2307/1592774
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
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 pullers 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).
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收藏
页码:142 / 149
页数:8
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