2012 Volume 65 Issue 2 Pages 147-152
The antimicrobial susceptibility of Campylobacter spp. and Salmonella spp. against ofloxacin (OFLX) and ampicillin (ABPC) was determined. The Campylobacter spp. and Salmonella spp. were isolated from broilers during the period from September 2005 to January 2009. Campylobacter and Salmonella spp. were detected simultaneously on 35 farms. Of the 35 farms, OFLX-resistant Campylobacter spp. were isolated from 11 farms,while Salmonella spp. were isolated from 6 farms. Four farms were positive for both OFLX-resistant Campylobacter and Salmonella spp. Meanwhile, ABPC-resistant Campylobacter spp. were isolated from 4 farms while Salmonella spp. were isolated from 14 farms. There were no farms that were positive for both ABPC-resistant Campylobacter and Salmonella spp. In the in vitro experiment, OFLX-resistant campylobacters were induced,but no OFLX-resistant salmonella was induced. A relationship between ABPC-resistance and β-lactamase was shown only in Salmonella spp. These results suggest that OFLX could be selective pressure for both Campylobacter and Salmonella spp., and that the pressure would be stronger for Campylobacter spp. It is considered that the mechanism of the emergence of ABPC-resistance differed between Campylobacter and Salmonella spp. om broiler farms.
