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ORIGINAL ARTICLE
Year : 2019  |  Volume : 12  |  Issue : 12  |  Page : 559-564

Prevalence and risk factors of avian influenza H9N2 among backyard birds in Iran in 2015


1 Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
2 Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
3 Division of Epidemiology& Zoonosis, Department of Food Hygiene & Quality Control, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
4 Department of Health and Management of Poultry Diseases, Iranian Veterinary Organization, Tehran, Iran

Correspondence Address:
Mohammad Hasan Rabiee
Division of Epidemiology& Zoonosis, Department of Food Hygiene & Quality Control, Faculty of Veterinary Medicine, University of Tehran, Tehran
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1995-7645.272486

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Objective: To investigate the prevalence and the risk factors of H9N2 avian influenza among backyard birds in Iran between October and November 2015. Methods: In this study, a total of 15 500 blood samples and 2 884 cloacal swab samples of backyard birds were collected in villages of Iran between October and November 2015. Then, serum samples were examined with the hemagluttination inhibition test and cloacal swab samples were pooled together and examined by RT-PCR. The samples that had serological titer ≥ 4 (log2) and villages that had at least one seropositive sample were considered positive. Results: Out of 559 villages, 526 (94.10%) were seropositive for the infection. Among 15 500 serum samples, 7 468 (48.18%) samples were seropositive for the infection. The seroprevalence according to species was 54.02% among chickens, 17.59 % among ducks, 18.73% among turkeys, 84.21% among pigeons and 12.15% among ostriches, partridges and pheasants. Based on molecular test, 3.04% villages were positive. The seroprevalence in hot and humid area was less than that in cold and humid area (P<0.05). Conclusions: H9N2 avian influenza has high seroprevalence among backyard birds of Iran. Therefore, preventive measures such as biosecurity Practices and monitoring should be applied to reduce the prevalence.


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