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Characterization of Western European Field Isolates and Vaccine Strains of Avian Infectious Laryngotracheitis Virus By Restriction Fragment Length Polymorphism and Sequence Analysis

Study Result The present study showed that at least three clones of infectious laryngotracheitis virus (ILTV ) have been circulating in Western Europe during the last 35 years. The most relevant part of this study was that the 104 isolates analyzed showed a high genetic similarity regarding the TK gene, and a large majority of the field isolates (98/ 104) were genetically related to the vaccine strains.