Table 2. The MIC distribution of 306 Streptococcus suis isolated in China (n=306).

Antimicrobials	MIC values (μg/mL)														Drug resistance rate (%)
	0.125	0.25	0.5	1	2	4	8	16	32	64	128	256	512	1,024
Note: Refer to the streptococcal drug sensitive threshold. Drug resistance threshold (μg/mL): a≥16, b≥4, c≥2, d≥8, e≥1, f≥8, g≥8, h≥4. Abbreviation: MIC=minimum inhibitory concentration.
Aminoglycosidesa	2	0	0	5	15	28	68	30	18	25	15	41	51	8	58.8%
Lincosamideb	9	0	0	0	69	0	0	1	9	7	12	75	106	18	74.5%
Fluoroquinolonesc	100	25	24	73	2	24	16	23	13	6	0	0	0	0	27.5%
Tetracyclinesd	0	6	0	2	9	45	32	33	25	39	43	5	1	0	58.2%
Macrolidese	2	4	20	0	3	19	22	21	19	17	51	111	17	0	91.5%
Chloramphenicolf	0	6	3	42	64	77	25	23	36	19	9	2	0	0	37.3%
Cephalosporinsg	163	24	26	11	6	64	9	2	1	0	0	0	0	0	3.9%
Penicillinsh	83	28	16	32	100	26	10	4	7	0	0	0	0	0	15.4%