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Infectious bursal disease in chickens, also known as infectious bursitis or supra-vesclitis, is an acute, highly exposed infectious disease caused by infectious bursal virus.
Natural infection of the disease occurs only in chickens, and chickens of all breeds can be infected. Chickens aged 1 to 15 weeks are susceptible, and chickens aged 3 to 6 weeks are more susceptible to disease. Adult chickens are mostly invisible, chicks are acute, in a short period of time the same coop chickens can be infected, and chickens adjacent to the coop will also be infected after 1 to 3 weeks. The incidence can be as high as 80% to 100%, usually on the 3rd day after infection, the fatality rate reaches a peak in 4 to 7 days, and then gradually decreases, the fatality rate generally ranges from 13% to 50%, and the chicks are even as high as 60%.
Sick chickens and poisonous chickens are the source of infection of the disease, the virus is mainly discharged with the feces of the sick chicken, polluting the feed, drinking water and the environment, so that the same flock of chickens through the digestive tract, respiratory tract and eye conjunctiva infection; various utensils, personnel and insects can also carry the virus, spread and spread; the disease can also be transmitted through eggs. In a chicken farm, the initial outbreak of the disease is usually the most acute, and the chicks that hatch later erupt again are less severe and are often overlooked.
The prevalence of the disease not only inhibits or reduces the chicks' immune response to a variety of vaccines, especially Newcastle disease vaccine, but also increases the susceptibility of sick chickens to certain microorganisms. The susceptibility and degree of infection of sick chickens to salmonella, E. coli, staphylococcus and other bacteria, Newcastle disease virus, adenovirus, reovirus, infectious bronchitis virus, infectious laryngeal tracheitis virus, etc. and other microorganisms increased.
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