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Trend of Changes in the Titer of Antibody against Avian Influenza Virus H9n2 during Raising Period in Vaccinated and Unvaccinated Broiler Farms in Qazvin Province, Iran: A Cohort Study | ||
| Archives of Razi Institute | ||
| مقاله 4، دوره 75، شماره 1، خرداد 2020، صفحه 9-16 اصل مقاله (506.47 K) | ||
| نوع مقاله: Original Articles | ||
| شناسه دیجیتال (DOI): 10.22092/ari.2018.120089.1183 | ||
| نویسندگان | ||
| K. Mirzaie1؛ A. Shoushtari2؛ S. Bokaie* 1؛ M.H. Fallah Mehrabadi2؛ S.M. Peighambari3 | ||
| 1Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran | ||
| 2Department of Poultry Diseases, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran | ||
| 3Department of Avian Diseases, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran | ||
| چکیده | ||
| Avian influenza virus (AIV) H9N2 is endemic in Iran and its large-scale circulation in the poultry industry of the country is devastating. This virus was first reported in the industrial poultry populations of Iran in July 1998. Some of the published studies showed that inactivated avian influenza (AI) vaccines are capable of inducing an immune response and providing protection against morbidity and mortality in different countries (Vasfi et al., 2002; Tavakkoli et al., 2011). Low pathogenicity avian influenza subtype H9N2 virus has been reported to have a zoonotic potential and widespread distribution in Iran. Therefore, water-in-oil emulsion vaccines are employed to control the disease in chickens (Nili and Asasi, 2003). This cohort study was conducted during July 2016-November 2017 in broiler chicken farms of Qazvin province, Iran to investigate the serological change trends in broiler chickens in this region. Level of immunity against the H9N2 virus was evaluated by hemagglutination inhibition assay. Fifteen farms out of thirty enrolled units used AI H9N2 killed vaccines. The minimum of mean antibody titers (MATs) was 4.54-2.42 and the maximum of MATs was 4.54+2.42 on day 3. In addition, the minimum and maximum MATs on day 50 were 0.4-0.64 and 0.4+0.064, respectively. The transfer rate of H9N2 AIV antibodies from the serum of breeders to the serum of chickens was calculated as 60.35% in our study. A significant difference was revealed between the maternal mean antibody titers (MMATs) and the MATs on day 3 (p <0.001). In addition, the difference between the MATs on day 3 and the MATs on day 10 was found to be significant (p <0.01). Moreover, MATs were significantly different between the vaccinated and unvaccinated herds on day 40 (p <0.05), while no significant difference was observed on days 3, 10, 20, and 30 (P>0.05). According to the results of this study, antibody titers in the vaccinated farms did not reach the protective level until the end of the rearing period. Most of the unvaccinated herds experienced a spurt in antibody titers due to exposure to the virus. Consequently, biosecurity measures must be implemented more seriously and strictly in broiler farms. | ||
| کلیدواژه‌ها | ||
| Antibody titer؛ Broiler farms؛ H9N2 avian influenza virus؛ Iran | ||
| عنوان مقاله [English] | ||
| ارزیابی روند تغییرات تیتر آنتی بادی علیه ویروس آنفلوآنزای پرندگان (تحت تیپ H9N2) درطول دوره پرورش طیور گوشتی واکسینه و غیرواکسینه در استان قزوین، ایران: یک مطالعه کوهورت | ||
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