87 ovine pneumonic lungs were examined. Out of these cases 52 cases were subjected for mycoplasma cultivation 22, were found to recover Mycoplsama arginini in addition to 4 strains of giucose fermenter mycoplsama were obtained.
Gross and detailed micoscopic investigations were performed. It was concluded from this work that the gross appearence in ovine mycoplasmal pneumonia consists mainly of congestion to dark greyish colour. Cut section have dark and of firm texture. An terior lobes were found ro be the most liable parts to harbour the infection thus means an air-born infection. Microscopically the main lesion was proliferative interstitial pneumonia with excessive lymphoid infiltration. From such cases it could be concluded that mycoplasma infection in sheep initially induces proliferative in terastitial pneumonia with lymphoid hyperplasia which begins in the cranial part and ventral side then proceed to involve the whole lebes of the lung in a lobular distribution.