Summary of the 2001-02 Pennsylvania H7N2 low pathogenicity avian influenza outbreak in meat type chickens
Summary of the 2001-02 Pennsylvania H7N2 low pathogenicity avian influenza outbreak in meat type chickens
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DOI：
10.1637/0005-2086-47.s3.812
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发表时间：
2003-01-01
期刊：
影响因子：
1.4
通讯作者：
Davison, S
中科院分区：
文献类型：
--
作者：
Dunn, PA;Wallner-Pendleton, EA;Davison, S
H7N2 低致病性 (LP) 禽流感 (AI) 病毒是从 2001 年 12 月 4 日至 5 日提交给宾夕法尼亚州动物诊断实验室系统的鸡中分离出来的。这些病例来自宾夕法尼亚州中部的两个肉种鸡群，这些鸡群具有急性、快速传播的呼吸道疾病的临床症状。后续采样中检测到 AI 病毒的血清转化。随后，在 2001 年 12 月 14 日至 2002 年 1 月 3 日期间提交的 5 个不同肉鸡群病例中分离出 H7N2 LPAI 病毒。肉鸡的临床症状和病变（如果存在）与多原因呼吸道疾病相符。除一只经过处理的肉鸡群外，所有病毒呈阳性鸡群的家禽均在原始病例提交日期后 11 天内在内部实施安乐死。加强对以阳性农场疫源地为中心的 10 英里半径范围内的家禽群的监测一直持续到 2002 年 3 月 1 日。没有发现更多病例。
H7N2 low-pathogenicity (LP) avian influenza (AI) virus was isolated from chickens submitted to the Pennsylvania Animal Diagnostic Laboratory System on December 4 and 5, 2001. The cases were from two broiler breeder flocks in central Pennsylvania that had clinical signs of an acute, rapidly spreading respiratory disease. Seroconversion to AI virus was detected on follow-up sampling. Subsequently, H7N2 LPAI virus was isolated in five different broiler flock cases submitted between December 14, 2001, and January 3, 2002. Clinical signs and lesions in broilers, when present, were compatible with multicausal respiratory disease. With the exception of one broiler flock that was processed, birds from all of the virus positive flocks were euthanatized in-house within 11 days of the original case submission date. Increased surveillance of poultry flocks within 10-mile radius zones centered at the foci of the positive farms continued until March 1, 2002. No additional cases were detected.