Table 1. Diameters of inhibition zones around antibiotics at varying concentrations with or without formate.

	Without formate	With formate
	Diameter (cm)	Diameter (cm)
Vancomycin
32 μg/ml	2.330 ± 0.054	2.140 ± 0.043***
64 μg/ml	2.578 ± 0.099	2.386 ± 0.088*
128 μg/ml	2.894 ± 0.024	2.538 ± 0.036***
Bacitracin
32 μg/ml	1.882 ± 0.037	1.746 ± 0.055**
64 μg/ml	2.203 ± 0.043	2.052 ± 0.067**
128 μg/ml	2.515 ± 0.044	2.235 ± 0.061***
256 μg/ml	2.830 ± 0.082	2.507 ± 0.085***

The data are shown as means ± standard deviations of five different plates (*p<0.05; **p<0.01; ***p<0.001).