Some Studies on Viruses Affecting The Respiratory System of Poultry Vaccinated Against NDV in Behira Province

Three hundred tracheal were collected from NewCastle diseasese vac cLneted birds (Lentogenic vaccinetal strain) as well as the same number of blood from the: the same birds at three doLfferent Farms in BeheraGove r-norate. The sera of the birds were teste(20.4%) and the lowest at 28~ 211, 212, 210 (3.2%, 1.8~ 1.8% and 1.4% respectivelj) AGP,]’ was done on the same s e r-a samples and only 17 aamp L« es Cave specific precipitating lines (5%), with the titre ranging between 21 and 25. There was a relationsh