Table 3.

Characteristics of Enterobacter strains and their respective transconjugants

StrainapI(s) of β-lactamasesApproximate size (kb) of plasmid(s)Antibiotic inhibition zone diam (mm)bMost likely β-lactamase
CAZATMGMSXT
E. coliC600N28322024
E. aerogenes1878.3, 6.850, 102024126AmpC, SHV-3
E. coliJP01/tr6.8502226148SHV-3
E. aerogenes 2008.3, 7.860, 50, 141412106AmpC, SHV-4
E. coliJP02/tr7.850, 101715128SHV-4
E. aerogenes 2208.3, 7.860, 50, 101514106AmpC, SHV-4
E. coliJP03/tr7.8501717128SHV-4
E. aerogenes 1848.3, 8.2151366AmpC, SHV-5
E. coliJP04/tr8.2171698SHV-5
  • a E. aerogenes 187, 200, 220, and 184 were donors; E. coli C600N served as the recipient; andE. coli JP01, -2, -3, and -4 were the respective transconjugants.

  • b CAZ, ceftazidime; ATM, aztreonam; GM, gentamicin; SXT, trimethoprim-sulfamethoxazole.