Table 1.

Bacterial population in vancomycin-pretreated healthy rhizosphere soil samples grown on TSA medium containing or lacking 5-µg/mL vancomycin.

Vancomycin concentration in soil extract (µg/mL)	Bacterial population (log CFU/g)
	0-h incubation			3-h incubation			6-h incubation
	w/ vancomycin	w/o vancomycin	p value	w/ vancomycin	w/o vancomycin	P value	w/ vancomycin	w/o vancomycin	P value
0	5.431 ± 0.159	6.113 ± 0.034	0.014	5.489 ± 0.093	6.111 ± 0.073	0.006	5.648 ± 0.117	6.130 ± 0.081	0.028
5	5.433 ± 0.124	6.073 ± 0.051	0.009	5.306 ± 0.073	6.015 ± 0.032	0.001	5.621 ± 0.130	6.257 ± 0.043	0.010
50	5.463 ± 0.108	6.042 ± 0.074	0.011	5.494 ± 0.100	6.991 ± 0.116	0.032	5.648 ± 0.174	6.077 ± 0.034	0.073
500	5.358 ± 0.086	6.004 ± 0.149	0.020	5.385 ± 0.089	5.442 ± 0.087	0.673	5.380 ± 0.123	5.636 ± 0.098	0.180

w/ = with, w/o = without.

CFU colony-forming units, w/ vancomycin TSA medium containing 5-µg/mL vancomycin; w/o vancomycin TSA medium lacking vancomycin.