Fig. 1

Antimicrobial synergy between SIM and polymyxins against S. aureus. (A) Antimicrobial effects of SIM combined with polymyxins against S. aureus ATCC 43,300 and USA300 by checkerboard assay. (B) Growth inhibition of antimicrobials alone or in combination against ATCC 43,300 determined by K-B test. PB: 250 µg; PB(S): 200 µg; PE: 200 µg. (C) Statistical analysis of the diameters about the inhibition zones by the K-B test. **: P < 0.01 compared with SIM; ***: P < 0.001 compared with SIM; ****: P < 0.0001 compared with SIM; #: P < 0.05 compared with PB(S)/PE.