Prevalence and molecular identification of avian Influenza H9N2 and Newcastle viruses in commercial broiler flocks involved respiratory complex syndrome in eight provinces of Iran (2019).
Subject Areas : Journal of Comparative PathobiologyPeyman Younesi 1 , آرش ghalyanchi 2 , H hosseini 3 , Kaveh Parvandar 4
1 - Department of Clinical Sciences, College of Veterinary Medicine, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 - گروه میکروبیولوژی و ایمونولوژی، دانشگاه تهران
3 - Islamic Azad University, karaj, Iran
4 - Faculty member
Keywords: Influenza, Newcastle, Broiler flock, RT-PCR, Iran, Prevalence,
Abstract :
Birds have a vast respiratory system, and numerous infectious factors can affect them because of this wide range. Industrial poultry is not exempt from this issue, and significant diseases cause the involvement of this system in birds. Viral agents mainly cause more destruction than other agents, and their high prevalence and contagion have made them considered one of the most critical threatening factors in this industry. Among all viral agents, Influenza and Newcastle viruses are crucial factors of industrial poultry farms in Iran and the world due to their lethality and high prevalence. To prevent these outbreaks, widespread vaccination is used in all types of poultry, but these diseases are still observed due to mutations in the genomic content and failure in immunization. In this study, eight provinces of the country were investigated. We took samples from 90 broiler poultry farms between September 2019 and the end of January 2019 and studied them with RT-PCR test. Our results showed that Khorasan Razavi (50%) and Kerman (30%) had the highest Newcastle disease and influenza prevalence, respectively, in all eight provinces. Constant monitoring of cases and reviewing vaccination programs of affected flocks every year are necessary for strategically controlling respiratory syndrome in broilers. It should be mentioned that it is essential to carry out epidemiological information on the influential factors in spreading this syndrome and the failure of vaccination strategies.
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