TABLE 2.

Antibiotic susceptibilities of strain PT581, mutant 19A, and the complemented mutant 19A

Strain (plasmid)Growth on antibiotic gradient plates (cm)a
RIF (4)VAN (400)ERY (400)AMK (2)NOV (400)
PT581>8.0>8.04.86.8>8.0
19A(pMMB207GM)1.94.01.52.63.2
19A(pMBGL11)2.2>8.03.54.5>8.0
  • a Susceptibility testing was performed using gradient plates. Growth across the gradient was recorded in centimeters; 8 cm was the maximum length of the plate. RIF, rifampin; VAN, vancomycin; ERY, erythromycin; AMK, amikacin; NOV, novobiocin. Numbers in parentheses following drug abbreviations are maximum concentrations of the antibiotics on the gradient plate in micrograms per milliliter.