Infectious bursal disease and ndv infection in a brown layer farm
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Date
2020-02
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Abstract
Infectious bursal disease (IBD), an acute, highly contagious viral disease affects the immune system
of young chickens, caused by infectious bursal disease virus (IBDV) belonging to the genus Avibirnavirus
within the family Birnaviridae. Though heavy outbreaks are less it continues to lurk in Tamil Nadu. A brown
layer chicken farm situated in Thiruvallur with a history of sudden death, clinically ill birds showing dullness
and watery diarrhoea was presented for necropsy. The birds were vaccinated as per schedule for NDV. The
farm had a stock of about five hundred birds of which there was a mortality percentage of 14.4 when the
birds were presented for necropsy. Necropsy examination revealed severe hemorrhages in the breast and
thigh muscles, pale liver mildly oedematous enlarged pale bursa with stray petechiae in the proventriculus.
Molecular screening for viral and bacterial diseases revealed the presence of IBD by PCR and NDV by
RT- PCR while it was negative for IB virus. E.coli could be detected in heart blood swab. Antibiogram
revealed nil sensitivity among the antibiotics commonly used. It was intermediate sensitive to cefotaxime,
amoxyclav, norfloxacin and ciprofloxacin and was resistant to gentamicin,sulphadimidine and tetracycline.
Histopathological examination revealed lymphoid cell depletion in the bursa, lymphocytolysis and few cystic
spaces. This case documents the presence of IBD infection in areas around Chennai. Infection of NDV as
known was probably due to immunosuppression caused by IBDV as the flocks were vaccinated for NDV as
per schedule.
Description
TNV_20thMVC_PP_Feb-2020_PA63
Keywords
Veterinary Science