عنوان مقاله [English]
This study was conducted to determine the ethiopathologic role of M. haemolitica in pneumonia of dromedary camel in Semnan province, Iran. In 37 round of investigation in Semnan slaughterhouse during autum and wintr 2012, 198 out of approximately 297 slauthered camel were randomly selected and subjected to postmortem examination for any sign of pneumonia. Based on approximate age, these camels were divided into 3 grioups as: ≤ 2 year, 2-5 year and ≥ 5 year. Out of 198 examined camels, 66 (33.33%) lungs had macroscopic signs of pneumonia. Proper samples from pneumonic and 13 apparently healthy lungs (approximately 10% of total apparently normal lugs) and under controlled conditions were obtained and for further microbiological and pathological investigations were dispatched to related laboratories. Based on culture results obtained from microbiological examinations, M. heamolytica was isolated in only 6 lungs belong to group with macroscopic lesions and not from apparently healthy lungs. In histopathologic study, except 4 (6.06%) cases of fibrinopurrulent bronchopneumonia and 1 (1.51%) case of pleuropneumonia, the remaining 61 (92.42%) pneumonic lungs, revealed various degrees of microscopic lesions of interstitial pneumonia from mild and acute to chronic form. The present study indicated, for the first time, the role of this microorganism in camel pneumonia in Semnan district.