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  • Title: Susceptibility of chicks to infectious bursal disease (IBD) following vaccination of their parents with live IBD vaccine.
    Author: Wyeth PJ, Cullen GA.
    Journal: Vet Rec; 1978 Sep 23; 103(13):281-2. PubMed ID: 213872.
    Abstract:
    Vaccination of parent chickens with a commercial live infectious bursal disease (IBD) vaccine under field conditions at varying ages and by different routes resulted in variable susceptibility to the disease in their chicks. There was little correlation between the methods of vaccination and the levels of immunity in the chicks. There was some evidence that levels of transferred immunity decreased with the age of the parents. Of five flocks examined, the onset of susceptibility to IBD occurred at two days of age in two flocks and about one week of age in the other three. Four flocks were completely susceptible by the 27th day, the other at 31 days. Precipitins were demonstrated at day old in 100 per cent of chicks in three flocks and in 80 per cent in the other two. The precipitins had disappeared in all flocks by 17 days of age.
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