Antibodies against infectious laryngotracheitis virus, influenavirus and Newcastle disease virus were not demonstrated. The prevalence of infections caused by adeno- and reovirus in egg-laying flocks was 85 and 74% respectively. Approximately 25% of the flocks had antibodies against infectious bronchitis virus and infectious bursal disease virus. A raised prevalence of antibodies against mycoplasmas was found with increasing age.
Animals Antibodies, Bacterial