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Infectious laryngotracheitis: Etiology, epidemiology, pathobiology, and advances in diagnosis and control - a comprehensive review
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Infectious laryngotracheitis: Etiology, epidemiology, pathobiology, and advances in diagnosis and control - a comprehensive review
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Journal Article
Infectious laryngotracheitis: Etiology, epidemiology, pathobiology, and advances in diagnosis and control - a comprehensive review
2020
Overview
Infectious laryngotracheitis (ILT) is a highly contagious upper respiratory tract disease of chicken caused by a Gallid herpesvirus 1 (GaHV-1) belonging to the genus Iltovirus, and subfamily Alphaherpesvirinae within Herpesviridae family. The disease is characterized by conjunctivitis, sinusitis, oculo-nasal discharge, respiratory distress, bloody mucus, swollen orbital sinuses, high morbidity, considerable mortality and decreased egg production. It is well established in highly dense poultry producing areas of the world due to characteristic latency and carrier status of the virus. Co-infections with other respiratory pathogens and environmental factors adversely affect the respiratory system and prolong the course of the disease. Latently infected chickens are the primary source of ILT virus (ILTV) outbreaks irrespective of vaccination. Apart from conventional diagnostic methods including isolation and identification of ILTV, serological detection, advanced biotechnological tools such as PCR, quantitative real-time PCR, next generation sequencing, and others are being used in accurate diagnosis and epidemiological studies of ILTV. Vaccination is followed with the use of conventional vaccines including modified live attenuated ILTV vaccines, and advanced recombinant vector vaccines expressing different ILTV glycoproteins, but still these candidates frequently fail to reduce challenge virus shedding. Some herbal components have proved to be beneficial in reducing the severity of the clinical disease. The present review discusses ILT with respect to its current status, virus characteristics, epidemiology, transmission, pathobiology, and advances in diagnosis, vaccination and control strategies to counter this important disease of poultry.
Publisher
Taylor & Francis,Taylor & Francis Ltd,Taylor & Francis Group
Subject
/ chicken
/ Chickens
/ Communicable Disease Control - methods
/ control
/ distress
/ Herpesviridae Infections - epidemiology
/ Herpesviridae Infections - physiopathology
/ Herpesviridae Infections - prevention & control
/ Herpesviridae Infections - veterinary
/ Herpesvirus Vaccines - therapeutic use
/ ILT
/ Infectious Laryngotracheitis virus
/ Latency
/ mucus
/ Poultry
/ Poultry Diseases - diagnosis
/ Poultry Diseases - epidemiology
/ Poultry Diseases - physiopathology
/ Poultry Diseases - prevention & control
/ quantitative polymerase chain reaction
/ Review
/ Sinus
/ Sinuses
/ vaccine
/ Vaccines
/ Viruses
