An experimental study on broiler chicken co-infected with the specimens containing avian influenza (H9 subtype) and infectious bronchitis (4/91 strain) viruses

Document Type : Short paper

Authors

1 Graduated from School of Veterinary Medicine, Shiraz University, Shiraz, Iran

2 Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran

3 Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran

Abstract

This experimental study was carried out to induce a co-infection of H9 AIV and IBV with inoculums
prepared from tracheal scrubbed epithelium tissues in natural co-infected birds to rule out the effect of field
undesired environmental conditions and also other infectious causative agents. Eighty 1-day-old broilers
were randomly divided into four equal groups. At 21 days of age, three test groups were inoculated
intranasally with prepared inoculums containing IBV and H9 AIV alone and a co-infected group. The fourth
group remained uninfected as a control group. The results showed that experimental co-infection of AIV and
IBV increased the severity of clinical signs, mortality rate and gross lesions. The HI titer against AIV
infection in the co-infected group was significantly higher than the HI titer of other groups, which may
indicate that IBV could promote the propagation of H9N2 AIV or stimulate the immune response.

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