Figure 1

Plasmid extractions from reference strains of E. coli and clinical isolates carrying armA or rmtB and their transformants (A), Southern hybridization with an armA -specific probe (B) and with a rmtB -specific probe (C). Lanes:1, E. coli V517; 2. E. coli V517/R1; 3, Amikacin-susceptible E. coli isolate; 4, E31; 5, E31 transformant; 6, E35; 7, E35 transformant.