Maternal antibody to infectious bronchitis virus: its role in protection against infection and development of active immunity to vaccine.

However, at days 14 and 21, such differences became highly significant ( P <0.01) as the majority of vaccinated birds (16/18 and 15/18, at 14 and 21 days, respectively) had no detectable serum antibody as compared to only 3/10 and 1/10 unvaccinated chickens at the respective days.

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