EFFICACY OF COMMERCIAL INFECTIOUS BRONCHITIS VACCINES AGAINST CANADIAN DELMARVA (DMV/1639) INFECTIOUS BRONCHITIS VIRUS INFECTION IN LAYERS

Efficacy of Commercial Infectious Bronchitis Vaccines against Canadian Delmarva (DMV/1639) Infectious Bronchitis Virus Infection in Layers

Vaccination is the most important way to control infectious bronchitis (IB) in chickens.Since the end of 2015, the Delmarva here (DMV)/1639 strain of infectious bronchitis virus (IBV) has caused significant damage to the layer flocks in Eastern Canada.The efficacy of a combination of existing IB vaccines licensed in Canada was assessed against expe

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