Malignant Ovine Theileriosis caused by T. lestoquardi is the lethal disease that causes high morbidity and mortality worldwide. The disease is diagnosed by clinical signs and pathological findings together with morphological demonstration of the parasite in lymph node biopsy and blood smears. To date, little is known about the pathogenesis of T. lestoquardi infection and the different tissue and organs alterations. T. lestoquardi infections are accompanied by severe pulmonary involvements. Serious tissue destructions and pulmonary oedema, suggest that emphysema and interstitial pneumonia may...