A survey on role of Mannheimia haemolytica in Sheep Pneumonia in Garmsar

In the present study، the possible role of M. haemolytica as a causative agent of sheep pneumonia in Garmsar province were investigated. For this purpose، samples weretaken from 120 slaughtered sheep (60 non- pneumonic and 60 pneumonic) with refer to Garmsar slaughter house. Before sampling and culturing، age، sex and location oflesions، were recorded. Based on acquired results، none of the lungs understudy was positive for M. haemolytica، while other bacteria (Pseudomonas، Proteus، Arcanobacterium Pyogenes، Klebsiella، Enterobacter، Streptococcus، Escherichia Coli، Pasteurella trehalosi) were isolated from lungs with or without lesions. Among of non-pneumonic lungs 9 (15%) were accompanied by bacterial isolation، In contrast، out of 60 pneumonic lungsbacteria were isolated from 54 (90%) lungs. It seems that some factors such as climatic، seasonal and breed differences have a role in disagreement between our resultsand other studies.