Isolation, Molecular Characterization and Antibiotic Susceptibility Pattern of Pasteurella multocida Isolated from Cattle and Buffalo from Ahwaz, Iran

Document Type: Original Articles

Authors

1 Department of Pathobiology, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

3 Graduate of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran

Abstract

Pasteurella multocida is a gram-negative, opportunistic pathogen and the common inhabitant of the upper respiratory tract of domesticated and wild animal species. It is a causative agent of numerous economically important diseases worldwide, such as enzootic bronchopneumonia in ruminants and haemorrhagic septicemia in cattle and buffalo. The present study was undertaken to determine the prevalence of P. multocida carriers, PCR-serogrouping and antibiotic susceptibility status of isolates detected in cattle and buffalo in Ahvaz, Iran. Nasopharyngeal and nasal swabs were collected from 227 cattle and 174 buffaloes. The swabs were streaked on MacConkey and sheep blood agar and incubated for 24-48 h at 37 °C. The presumptive P. multocida colonies were identified based on standard biochemical testing and further confirmed by PCR. A multiplex PCR was used to determine the five pathogen serogroups (i.e., A, B, D, E, and F). Antimicrobial susceptibility of P. multocida isolates was determined using the Kirby–Bauer disc diffusion method on Mueller-Hinton agar supplemented with 5% sheep blood. Out of 401 tested samples, P. multocida was recovered from 10/227 (4.4%) and 12/174 (6.89%) cattle and buffaloes, respectively. Fifteen isolates (68.19%) belonged to serogroup A, 5 (22.72%) to serogroup D, and 2 (9.09%) isolates were untypeable. No isolate belonged to B, E, and F serogroups. All P. multocida isolates were sensitive to nitrofurantoin, florfenicol, ciprofloxacin, enrofloxacin, trimethoprim-sulfamethoxazole, oxytetracycline, and ceftriaxone. The most common finding was resistance to tylosin (90.9%), followed by resistance to oxacillin (54.54%).

Keywords

Main Subjects


Article Title [French]

L'isolement, l'identification moléculaire et profil de sensibilité aux antibiotiques en Pasteurella multocida isolé des vaches et des buffles à Ahvaz en Iran

Abstract [French]

Pasteurella multocida est une bactérie gram-négative, opportuniste pathogène et flore normale des voies respiratoires supérieures des espèces animales domestiques et sauvages. Cette bactérie cause des maladies économiquement importantes partout dans le monde telles que bronchopneumonie enzootique chez les ruminants et la septicémie hémorragique chez les vaches et les buffles. L'objectif de cette étude est la détermination de la prévalence des porteurs de Pasteurella multocida chez les vaches et les buffles à Ahvaz, la détermination des sérogroupes capsulaires de bactéries et aussi l'évaluation de la sensibilité aux antibiotiques des isolats. Pour ce faire, les prélèvements nasal et rhinopharyngé ont été collectés de 227 vaches et 174 buffles. Les écouvillons ont été mises en culture dans environnement Mac et Cancan et gélose au sang de mouton et mises à incuber pendant 24-48 heures à 37 C. Colonies soupçonnées à Pasteurella multocida ont été identifiées sur la base des tests biochimiques standards et confirmées par PCR. Les multiples réactions de PCR ont été utilisées pour déterminer les cinq sérogroupes capsulaires bactérien (A, B, D, E et F). L'évaluation de la sensibilité aux antibiotiques des isolats de Pasteurella multocida a été également mise en place en utilisant la méthode de diffusion sur disque (Kirby-Bauer) sur un milieu de gélose de Mueller Hinton additionné de 5% sang de mouton. Parmi 401 échantillons, Pasteurella multocida était trouvé respectivement de 10.227 (4.4%) et 12.174 (6.89%) des vaches et des buffles. 15 isolats (68.19%) appartenait au sérogroupe A, 5 isolats (22.72%) appartenait au sérogroupe D et 2 isolats (9.09%) étaient inclassable. Aucun isolats n’appartenait au sérogroupes B, E et F. Tous les isolats de Pasteurella multocida étaient sensibles à nitrofurantoïne, Florfenicol, ciprofloxacine, enrofloxacine,Triméthoprime sulfaméthoxazole , oxytétracycline, ceftriaxone. La plus grande résistance était à la tylosine (90.9%), ensuite à oxacilline (54.54%), streptomycine (45.45%), ampicilline (27.27%) , Erythromycin (13.63%) et enfin pénicilline (9.1%).

Keywords [French]

  • Pasteurella multocida
  • buffle
  • vache
  • sérogroupes
  • la sensibilité aux antibiotiques

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