Evaluation of some avian encephalomyelitis vaccines used in Egypt

In this work we made three experiments. Experiment No. (1) for evaluation of both single and simultaneous avian encephalomyelitis vaccines at different ages in layer. In this experiment we reached to the best age of vaccination of layers and breeders by AExponent No, 2 and Exponent No, 3 for evaluation of maternal drived antibodies of avian encephalomyelitis in baby chicks and challenged them by a virulent live virus of AE via injection on the brest muscle. We found that all chicks have a high protective Also, the chicks when challenged at 14 days old protected , No signs and no lesions but revealed little histophatological lesions.