Table 6.

The growth of resistant strains after exposed to different drug concentrations.

Time (h)	B	0.125	0.25	0.5	1	2	4	8
2	N	N	N	N	N	N	N	N
4	N	N	N	N	N	N	N	N
6	N	N	N	N	N	N	N	N
8	+	N	+	N	N	N	N	N
12	+	+	N	N	+	N	N	N
18	+	N	+	N	+	+	N	N
24	++	++	+	++	N	+	N	N
36	++	++	++	+	N	++	++	N
48	++	++	++	++	+	++	++	N

B, the blank group.

N, colony number below 10 CFU/mL.

+, colony number between 10 and 100 CFU/mL.

++, colony number beyond 100 CFU/mL.