Antimicrobial resistance and serotyping of Salmonella enterica subsp. enterica isolated from poultry in Croatia.

Abstract

During 2010, the minimum inhibition concentrations (MIC) for 158 isolates of Salmonella enterica subsp. enterica were determined. The highest number of isolates belonged to the serovars Enteritidis 54 (34%), Mbandaka 49 (31%) and Infantis 19 (12%). MICs were determined for ciprofloxacin, cefotaxim, trimethoprim, ampicillin, nalidixic acid, gentamicin, chloramphenicol, tetracycline, streptomycin and sulfamethoxazole. All tested isolates were sensitive to chloramphenicol and streptomycin. A total of 157 (99.3%) isolates were sensitive to gentamicin, 156 (98.7%) to cefotaxim, 154 (97.5%) to tetracycline, 151 (95.5%) to trimethoprim and ampicillin, 135 (85.4%) to ciprofloxacin, 128 (81%) to sulfamethoxazole and 92 (58%) to nalidixic acid. According to the number of antimicrobials to which individual isolates were resistant, 66 (41.7%) isolates were sensitive to all antimicrobials, 68 (43%) were resistant to one antimicrobial, 20 (12.7%) to two antimicrobials and 4 (2.6%) to three tested antimicrobials. In comparison with the level of resistence of Salmonella spp. in other European countries, it can be concluded that strains of Salmonella spp. isolated from poultry in Croatia have satisfactory sensitivity to antimicrobial drugs.