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Research Article
 

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



M.S. Mahmood , M. Siddique and I. Hussain
 
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ABSTRACT

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.

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  How to cite this article:

M.S. Mahmood , M. Siddique and I. Hussain , 2004. Carrier State Studies of Infectious Bronchitis Virus in Asymptomatic Layer in Pakistan . International Journal of Poultry Science, 3: 547-549.

DOI: 10.3923/ijps.2004.547.549

URL: https://scialert.net/abstract/?doi=ijps.2004.547.549

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