An atypical, mild form of infectious laryngiotracheitis (ILT) was diagnos ed in a flock of 14 week-old, Fayoumi chickens at Assiut Province. fection took the form of respiratory distress, with 15% morbidity and 5% mortality rate. The virus was isolated and identified. The virus induced large pale lesions on the cherioallantoic membrane of chicken embryos. The disease was reproduced in sceptible chickens. Typical signs of respiratory distress were observed. On postmortum examination mucopurulent inflammation of the respiratory tract in addition to typical
intranuclear inclusions were observed microscopically.