Infectious Laryngotracheitis

Infectious laryngotracheitis (ILT) is a respiratory tract infection of chickens caused by Gallid herpesvirus type 1 (GaHV-1). This virus may cause severe production losses due to mortality and/or decreased egg production. The diagnosis of GaHV-1 requires laboratory assistance because a sole diagnosis based on clinical presentation can be misleading. Other respiratory pathogens of poultry can cause similar clinical signs and lesions. Cooperative control of ILT outbreaks by collaboration between government and industry is most desirable. In controlling ILT outbreaks, the most effective approach is a coordinated effort to obtain a rapid diagnosis, institute a vaccination program, and prevent further virus spread. Prior to implementation of any vaccination program it is important to review the country's regulations for the use of vaccines against GaHV-1. The importance of site quarantine and hygiene in preventing the movement of potentially contaminated personnel, feed, equipment, and birds is central to successful prevention and control of ILT.