TABLE 1.

Bacterial strains used in matings with APEC O2

Name	Source	Mating frequency with APEC O2a	Drugs to which resistance was acquired by transconjugantb
APEC 419	Lesion of chicken with colibacillosis	2.3 × 10−2	Ap Te St Su Gn Tm An Bc
AFEC A3	Feces of healthy chicken	1.7 × 10−2	Ap Te St Su Gn Tm An Bc
UPEC 2000-1	Human urinary tract infection	2.1 × 10−2	Ap Te St Su Gn Tm An Bc
E. coli DH5α	NAc	1.9 × 10−2	Ap Te St Su Gn Tm An Bc
S. enterica serovar Typhimurium 475	Centers for Disease Control and Prevention	2.5 × 10−2	Ap Te St Su Gn Tm An Bc

^aMating frequencies are expressed as the proportion of transconjugants to recipients.

^bAp, ampicillin; Te, tetracycline; St, streptomycin; Su, sulfisoxazole; Gn, gentamicin; Tm, trimethoprim; An, silver nitrate; Bc, benzalkonium chloride.

^cNA, not available.