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Abstract
Extract
Infectious laryngotracheitis (ILT) is an acute respiratory disease of fowls which was first reported from the U.S.A. by May and Tittsler Citation(1925). Both severe acute forms with high mortality and chronic enzootic forms with low mortality have been described, and the earlier literature was reviewed by Jordan Citation(1966). In New Zealand ILT virus was first isolated in 1957 (Webster, Citation1959).