Abstract
The age of the chicken at the time of infection with infectious avian encephalomyelitis virus (IAEV) and the route of the administration of the virus had a marked effect on the development of the clinical disease. Chickens given the virus by intramuscular, intraperitoneal and oral routes exhibited a decreased susceptibility to development of clinical disease with increasing age. Irrespective of age, chickens were consistently susceptible to intracerebral inoculation of IAEV. Chickens infected with the virus at 1-, 7- and 14-days of age developed lower neutralising antibody titres to IAEV than chickens infected at 21 and 28 days. A relationship between the ability to produce specific neutralising antibody to IAEV and susceptibility to the development of clinical disease is discussed.
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