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Avian Infectious Laryngotrachetitis outbreaks in Iranian Broiler Farms
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Naser Sadri   , Seyed Ahmad Madani , Hossein Hosseini , Hamideh Najafi , Arash GhalyanchiLangeroudi * |
| Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran. |
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Abstract: (10 Views) |
Background and Aims: Infectious laryngotracheitis virus is a member of Gallid alphaherpesvirus 1 causing an acute respiratory infection in chickens throughout the world. The virus lowers normal growth and egg production and leads to economic damages during outbreaks. In Iran, the use of ILT vaccines is restricted to layer poultry farms, and vaccination is not applied in broilers since the outbreaks seldom occur among broilers. Some ILT suspected outbreaks were seen in broiler farms of two provinces of Iran. The present study was conducted to detect the etiologic agent.
Material and methods: Evaluation of clinical signs and gross lesions were performed to diagnose the disease. A PCR test targeting a 113-bp product from the ILTV UL15a gene was carried out to confirm the diagnosis.
Results: The affected chicks represented clinical signs of coughing, sneezing, nasal discharge, gasping, and conjunctivitis with mortality. Hyperemia and bloody mucus in tracheas were observed in post mortem analysis. In the PCR test, samples collected from all of the examined four farms showed the expected 113-bp band size.
Conclusions: The present work for the first time diagnosed ILT outbreak based on a molecular method in broiler chickens kept in Iran. This is an alarming issue according to the intensive population of broilers, hinting an urgent need for more investigations to identify probable ILTVs circulating among broiler poultry farms causing either mild or severe respiratory diseases. Virus isolation and full genome sequencing are required to characterize the viruses. Furthermore, vaccination of pullets against ILT might be effective to control the outbreaks. |
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| Keywords: Avian Infectious Laryngotrachetitis, Broiler, Iran, Outbreak |
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Full-Text [PDF 459 kb]
(6 Downloads)
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Type of Study: Short communication |
Subject:
General
Received: 2024/01/19 | Accepted: 2024/06/12 | Published: 2024/06/12
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