Epidemiological study on pasteurellosis in cattle and buffaloes / Amany Dieb Bahr Dieb ; Supervised Mahmoud Mohamed Amin Abdalhady , Wagdy Rady Elashmawy , Ashraf Mohamed Abaas

Thesis (M.Sc.) - Cairo University - Faculty of Veterinary Medicine - Department of Internal Medicine and Infectious Diseases

Pasteurellosis is one of the most important economic diseases in ruminants, especially in cattle and buffaloes. It is caused by Pasteurella multocida and Mannheimia haemolytica. In the current study, a total number of 136 pneumonic and suddenly dead cattle and buffaloes of both sexes of different age groups, in winter and summer seasons were clinically examined. 128 nasal swabs and 41 blood samples were collected from 128 pneumonic cattle and buffaloes as well as 8 lung, 5 liver, 2 kidney, 4 heart, 4 spleen and 6 blood samples were collected from 8 suddenly dead cattle and buffaloes due to haemorrhagic septicemia. All samples were bacteriologically examined for isolation of P. multocida and M. haemolytica. There were 13 M. haemolytica and 8 P. multocida isolates recovered from the examined pneumonic cattle and buffaloes and 1 M. haemolytica and 4 P. multocida isolates recovered from suddenly dead cattle and buffaloes. Histopathological examination of different tissues collected from suddenly dead animals revealed sever pulmonary congestion and edema, diffuse vacuolization of myocytes with dispersion of myocardial fibers by serosanguinous edematous fluid, portal and sinusoidal congestion with periportal hemorrhages, centrilobular hepatocellular necrosis, fatty change of the midzonal hepatocytes, congestion of splenic red sinusoids and necrosis of the renal tubular epithelium with congestion of peritubular blood capillaries. The highest rate of infection was in males, in winter season and in 6-12 month age group

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