Serological and Molecular Survey of Avian Influenza H9N2 Infection in Human Poultry Farm Industries

Document Type : Research Paper

Authors

1 Master Sciences of Virology, Karadje,Hesarak, Institute of Research on Vaccines and Serology Razi, Karadge, Iran

2 Assistant Professor of Birds Disease, Institute of Research on Vaccines and Serology Razi, Karadge, Iran

3 Associate Proofessor of Microbiology and Immunology, Institute of Research on Vaccines and Serology Razi, Karadge, Iran

4 Resident of Birds diseases, Institute of Research on Vaccines and Serology Razi, Karadge, Iran

5 Master Sciences of Microbiology, Institute of Research on Vaccines and Serology Razi, Karadge, Iran

Abstract

Introduction
 
Influenza virus H9N2 Low Pathogenicity of the viruses that are causing the disease in 1999, two 1 and 4-year-old girl in Hong Kong. Although influenza A H9N2 subtype virus is considered as widely spread low pathogen in poultry, however there are a few reports of human infection by this virus. This study was conducted to evaluate if such infection in human related by Poultry Farm Industries i.e. workers of slaughter house, poultry farms, and poultry clinics in Iran has occurred or not.
 
Materials and Methods
 
In this study, sera and swabs–nasal and throat- were collected from workers of slaughter houses, poultry farms, Razi institute. To prevent false positive and negative results in HI test the sera were treated by trypsin-periodate and concentrated RBC respectively. RT-PCR was accomplished seeking HA and NP genes of H9N2 subtype influenza viruses.
 
Results
 
Of 148 sera HI titers, two and 17 samples were 1/160 and 1/40 respectively for antibody against H9N2 influenza virus. The higher titers belonged to slaughter house workers. No viruses were detected in RT-PCR.
 
Conclusion
 
The positive sera for antibody against H9N2 influenza virus showed a changing tendency of these viruses toward infecting human tracheal epithelia. However the highest titer in slaughter house worker showed the need to close contact with poultry and their feeces for infection to be occurred. It means that the virus needs more circulation in human population to be adapted as true human influenza virus.

Keywords

References

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medical journal of mashhad university of medical sciences
Volume 52, Issue 3 - Serial Number 3
September and October 2008
Pages 133-140

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