Studies on Infectious Laryngotracheitis Virus in Chickens

Three experiments were conducted in this study to investigate the following points:1. Comparative study on 3 strains of infectious laryngotracheitis (ILT) virus namely, German virulent strain, Assiut virulent strain and modified eGg adapted vaccinal straiand Assiut ILT virulent virus strains, respectively. Morphology of pock 1esione produced by each virus strain and the histopathological pictu:r.e were shown as follow, the vaccinal virus strain induced coalscent pock lesions 3-5 mm in diameter with depres