Abstract: The aim of this study was to examine the bacterial flora of nasal cavity in apparently healthy and unhealthy Holstein cattle and determine the antimicrobial susceptibilities of Pasteurella multocida and Mannheimia haemolytica strains isolated from samples. Nasal swab samples were collected from 100 Holstein cattle, 70 of these were apparently healthy and 30 were unhealthy with the following respiratory signs: nasal discharge, coughing and dyspnoea. A total of 220 bacterial isolates were detected on Columbia blood agar plates, 102 (46.4%) of these were recovered from healthy and 118 (53.6%) from unhealthy Holstein cattle. The most frequently isolated species from the nasal cavity of the healthy animals sampled were Staphylococcus epidermidis (32.9%) and S. aureus (24.3%), while the most prevalent species in unhealthy cattle were Pseudomonas aeruginosa (40.0%), P. multocida (40.0%) and M. haemolytica (100.0%). According to antibiotic susceptibility test results, enrofloxacin (95.0%) was the most effective antibiotic on P. multocida isolates, while 95.0% of M. haemolytica isolates were susceptible to gentamicin. Among the P. multocida isolates the highest resistance was found against to kanamycin (70.0%), while erythromycin resistance were detected as 90.0% for M. haemolytica isolates.
Esra Seker, Yahya Kuyucuoglu and Selahattin Konak, 2009. Bacterial Examinations in the Nasal Cavity of Apparently Healthy and Unhealthy Holstein Cattle. Journal of Animal and Veterinary Advances, 8: 2355-2359.