Carrier State Studies of Infectious Bronchitis Virus in Asymptomatic Layer in Pakistan
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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Copyright (c) 2004 Asian Network for Scientific Information
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This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.
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