Clinico-Pathological Features of Highly Pathogenic Avian Influenza (HPAI-H5N1) Outbreaks in Commercial Chickens in Nigeria


In early January 2006, the first confirmed oubreaks of avian influenza in domestic birds occurred in the commercial chicken flocks in Kaduna, Jos and Kano States in the northern part of Nigeria. The outbreaks were confirmed to be the highly pathogenic avian influenza (HPAI) caused by the subtype H5N1. The outbreak was spontaneously reported in Jos, and about 10 days later it was reported in Kano and it quickly spread to other parts of the country. The infection was characterized by very high mortality in commercial layers. It was also observed to affect turkeys, broilers, cockerels, backyard/local chickens, ostriches, pigeons, guinea fowls, geese and ducks. The gross and microscopic lesions were found to similar to what have been described earlier for the disease.



Clinico-Pathological, Commercial Chickens, Nigeria, Pathogenic Avian Influenza (HPAI-H5N1), Outbreaks