Table 1.

Cephalosporin-resistant Salmonella isolates

Antibiotic resistancesaIsolateSpeciesSourceCitybAntibiotic usePFGE typepIcSerovarPhage typea
CeSSuCTGTsF613BovineLungCorydonNoneF5.4, 8.7TyphimuriumU302
CeSSuCTGTs263BovineFecalElkaderUnknownA5.4, 8.7Typhimurium subsp. copenhagenNT
370PorcineIntestineWebster CityNoneC5.4, 8.7Heidelberg
CeSSuCTG272PorcineLiverHospersUnknownB5.4, 8.7TyphimuriumDT6
274PorcineIntestineLorimarUnknownB5.4, 8.7TyphimuriumDT6
447PorcineIntestineBeamanCeftiofur, florfenicolD8.7Give
CeSSuCT530BovineLymph nodeAtlanticNoneE8.7Heidelberg
532BovineIntestineStrawberry PointAmproliumA5.4, 8.7Typhimurium subsp. copenhagenNT
R1339HumanStoolIowa CityUnknownX8.7TyphimuriumDT104
R1849HumanStoolMason CityUnknownY8.7Newport
  • a Resistances are shown by different combinations of the following abbreviations: Ce, cephalosporins; S, streptomycin; Su, sulfamethoxazole; C, chloramphenicol; T, tetracycline; G, gentamicin; Ts, trimethoprim-sulfamethoxazole; and F, flouroquinolone.

  • b All cities listed are in Iowa.

  • c pI determined by isoelectric focus analysis.

  • d Phage typing performed onSalmonella serovar Typhimurium and serovar Typhimurium subsp. copenhagen isolates. NT, nontypeable.