Abstract

Gross and Histopathological Based Investigation of Pneumonic Pasturellosis in Sheep

Authors: Shoaib Shafqat, Rahmeen Ajaz, Zeeshan Ahmad Bhutta and Jahanzaib

DOI: http://dx.doi.org/10.71081/cvj/2024.027

Abstract
The pneumonic pasteurellosis is known as mannheimiosis in sheep and is caused by Mannheimia haemolytica, which causes huge economic losses to livestock farmers in terms of high mortality and treatment therapy. This study indicates clinical and pathological ailments recorded during an outbreak of pneumonic pasturellosis in sheep. Clinical ailments including salivation, dyspnea and hyperthermia were observed in morbid sheep prior to death. Compared to adult sheep, young animals had a considerably (P<0.03) increased mortality rate. The results on the necropsy lesions showed pericarditis, exudates in the trachea, pulmonary edema, severe pleural adhesions, congestion and consolidation of lungs. Kidneys were hypremic and congested in different cases. Straw color fluid was observed at necropsy in peritoneal, thoraxic and abdominal cavity of infected animals. The intestinal mucosa especially jejunum mucosa was congested and mucoid exudate was observed in intestine. Microscopic observations indicated interstitial pneumonia and necrotic areas surrounded by inflammatory cells. Lungs exhibited peri-vascular cuffing, thicker interlobular septa, congestion, fibrin deposition, edema, and bronchial epithelial hyperplasia. Microscopic changes in different sections of heart of infected sheep included edema, leukocytic infiltrations and inflammatory exudates. In conclusion, it is recorded that M. haemolytica causes significant pneumonic changes in sheep and is a major cause of mortality.

Keywords: Congestion, Edema, Mannheimia haemolytica, Pneumonic pasteurellosis, Sheep.