Fig. 3

Spectrum of antibiotic resistance of botanical-resistant and penicillin-resistant S. aureus strains. Bacterial cultures (Staph Pen^S, ATCC 14775; Staph Pen^R, ATCC 11632; and Staph Larrea^R) were tested for antibiotic susceptibility using the standard Kirby Bauer disc diffusion method. Standard antibiotic discs included penicillin 10 μg, tetracycline 30 μg, vancomycin 30 μg, and ciprofloxacin 5 μg. The diameters of the zones of complete inhibition were measured using calipers in mm. Values shown with error bars represent the standard deviation from three separate experiments. Statistical analysis was performed using a paired t-test. Samples with statistically significant differences are indicated with the calculated p-value