Isolation of the Pasteurella Multocida and Mannheimia Haemolytica in Sheep and Lamb Cases of Pneumonia and Detection of Their Antibiotic Resistance in the Aegean Region

Abstract

In this study, the presence and antimicrobial susceptibility of Mannheimia haemolytica and Pasteurella multocida pathogens in 200 sheep-lamb lung samples with pneumonia were investigated in 7 provinces of the Aegean region between 2019-2021. The tissues of the animals were inoculated into 7% blood agar and then incubated at 37oC for 24-48 hours. Gram staining was performed on the pure colonies and Gram-negative, oxidase-positive samples were confirmed with the Vitek 2 system. An Antibiogram test was performed and amoxicillin-clavulanic acid, enrofloxacin, erythromycin, florfenicol, gentamicin, oxytetracycline, sulfamethoxazole-trimethoprim, tulathromycin discs were used. M. haemolytica was detected in 20(10%) of the samples and P. multocida was detected in 22(11%) of the samples. 20 of the P. multocida isolates (91%) were susceptible to amoxicillin-clavulanic acid, florfenicol, and tulathromycin, and 20 of the M. haemolytica isolates (100%) were susceptible to enrofloxacin, oxytetracycline, florfenicol, and tulathromycin. Subsequently, 6 of the P. multocida isolates (27%) were resistant to erythromycin and oxytetracycline, and 5 of the M. haemolytica isolates (25%) were to sulfamethoxazole-trimethoprim. As a result, M. haemolytica and P. multocida can be seen with similar percentages as pneumonic agents in sheep-lamb pneumonia cases in the Aegean region, but effective treatment can be done with the right antibiotic selection.