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Online Journal of Veterinary Research©

 

Volume 26 (6): 429-437, 2022.

Biochemical, antibiotic sensitivity, mice lethality and prevalence of Pasteurela multocida

pneumonia in small ruminants

 

Yahya Tahamtan DVM PhD1, Hamed Mirghafari2, Masoumeh Hayati MSc PhD1

 

1Bacteriology Dep. Razi Vaccine and Serum Research Institute-Shiraz, 2Bacteriology Department, Science and Research Branch (Kurdestan), Islamic Azad University, Iran.

ABSTRACT

 

Tahamtan Y, Mirghafari H, Hayati M., Biochemical, antibiotic sensitivity, mice lethality and prevalence of Pasteurela multocida pneumonia in small ruminants, Onl J Vet Res, 26 (6): 429-437, 2022. Seven hundred and fifty nasal and throat swabs of M. haemolytica and P. multocida from sheep and goats were isolated for biochemical, antibiotic sensitivity, mice lethality and prevalence evaluations. Thirty four (4.47%) P. multocida isolates were positive to oxidase, catalase, indole production, glucose and lactose fermentation tests. The isolates produced non-haemolytic colonies on blood agar and failed to grow on MacConkey agar. Six isolates induced 100% mortality in mice whereas the rest caused 50%.  A short mean dead time (MDT) occurred in 18% of inoculated mice. All isolates were resistant to oxytetracycline and erythromycin, fully sensitive to penicillin and slightly sensitive to trimethoprim. Prevalence was highest in spring and late summer. Isolates with short MDT were highly virulent inducing severe pneumonia.

                                                                

Key words: Pasteurella, Sheep, Goats, Iran.

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