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Carrier State Studies of Infectious Bronchitis Virus in Asymptomatic Layer in Pakistan

机译:巴基斯坦无症状层中传染性支气管炎病毒的携带者研究

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Isolation of infectious bronchitis virus (IBV) was conducted in asymptomatic layer flocks with a history of IB or IB vaccination at least from 5 to 20 weeks before the day of sampling. A trypsin-induced hemagglutination (THA) assay to detect IBV in allantoic fluid of embryonated eggs was used. Detection of IBV through THA showed that group A [5 wks post-inoculation (PI)] was 100%, group B (10 wks PI) was 86%, group C (15 wks PI) was 74% and group D (20 wks PI) was 28% positive for IBV. Virus titre was found negatively correlated with the PI duration.
机译:至少在采样日前5至20周,在有IB或IB疫苗接种史的无症状鸡群中进行传染性支气管炎病毒(IBV)的分离。使用胰蛋白酶诱导的血凝(THA)检测来检测胚卵尿囊液中的IBV。通过THA检测IBV显示,A组[接种后5周(PI)]为100%,B组(PI每周10周)为86%,C组(PI每周15周)为74%,D组(20周) PI)的IBV阳性率为28%。发现病毒效价与PI持续时间呈负相关。

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