Sero-survey of H5 & H7 sub types of Avian Influenza in commercial and backyard poultry of Iran -2014

Avian Influenza is viruses from the Orthomyxovirida family. This disease, in poultry, turkey, and many other birds caused by different subtypes of type A influenza virus.

The aim of this study was to estimate probability infections of H5 and H7 subtypes of AI viruses in commercial and backyard poultry in Iran.

This cross-sectional study was done in Iran’s commercial and domestic poultry from September to December in 2013. The samples were examined with the HI test to differentiate H5& H7. A total of 1315 premises and 29058 birds were sampled.

All premises were negative for H7 subtype and five premises (3 broiler breeders and 2 villages) out of 1315 were positive in HI test. All the collected swab samples from H5 seropositive premises were PCR negative for detection of H5. The results of our study showed that existing live bird marketing with OR=19.68(CI 95% 2.18-177.38) and existing duck farm within up to a 3 km radius with OR=11.33 (CI 95% 1.30-96.68) were risk factors for H5 sub type.

Based on live bird marketing role in transmission and spreading of Influenza viruses specially at the time of migration season in country and the probability of hunting and selling of them at these markets, continuous monitoring of these markets for early detection of probable infections and preventing the spread of infection to other poultry is recommended.