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Prevalence of avian influenza H5, H7, and H9 viruses in commercial layers in Karachi, Pakistan | ||
| Iranian Journal of Veterinary Research | ||
| دوره 22، شماره 4 - شماره پیاپی 77، 2021، صفحه 352-355 اصل مقاله (268.27 K) | ||
| نوع مقاله: Short paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijvr.2021.41104.5964 | ||
| نویسندگان | ||
| A. A. Channa1؛ M. Tariq* 1؛ Z. A. Nizamani1؛ N. H. Kalhoro2 | ||
| 1Department of Veterinary Pathology, Faculty of Animal Husbandry and Veterinary Sciences, Sindh Agriculture University, Tandojam, Pakistan | ||
| 2Research and Development Section, Sindh Institute of Animal Health, Karachi, Pakistan | ||
| چکیده | ||
| Background: Avian influenza viruses (AIVs) cause significant harm to the poultry industry due to mortality as well as high morbidity along with the risk of potential zoonotic transmission to humans. Aims: The study aimed to investigate the prevalence of influenza H5, H7, and H9 viruses and their co-infections in layers having respiratory distress such as sneezing, coughing, and tracheal rales. Methods: Totally, 960 tracheal swabs (240 swabs in each season) were collected from 120 poultry flocks, including 10 farms per month and 8 samples per flock, located in Karachi where the outbreaks were reported. The samples were confirmed through antigen ELISA and subtyped by RT-PCR. Results: Antigen ELISA revealed that the prevalence of avian influenza viruses was 26.45%; however, seasonal differences were not significant (P<0.05). RT-PCR subtyping of hemagglutinin (HA) gene revealed the higher prevalence of H9 virus (40.16%) as compared to H7 virus (5.51%) and H5 virus (4.73%). The co-infections comprised H5/H7/H9 (37.0%) and H5/H9 (12.6%). Conclusion: This study shows that AI is endemic in layer farms in Karachi where the H9 subtype is predominant along with co-infections of H5/H7/H9 subtypes. | ||
| کلیدواژهها | ||
| Avian influenza virus؛ Karachi؛ Layers؛ Prevalence | ||
| مراجع | ||
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