Table 3. In vitro activities of the antimicrobial agents tested against the 135 Streptococcus pneumoniae isolates.

Antibiotic	MIC50	MIC90	Range	S (%)	I (%)	R (%)
Penicillin	0.032	0.75	<0.016–4	65.2	27.4	7.4
Amoxicillin	0.032	2	0.016–64	90.4	5.9	3.7
Cefuroxime	0.047	2	0.016–12	80	6.7	13.3
Cefotaxime	0.047	0.75	<0.016–8	95.6	2.2	2.2
Cefepime	0.19	1	0.016–8	91.2	4.4	4.4
Imipenem	0.047	0.125	0.002–3	91.9	5.9	2.2
Meropenem	0.047	0.25	0.002–3	92.6	5.9	1.5
Erythromycin	0.064	≥256	0.016–≥256	69.6	-	30.4
Clindamycin	0.064	≥256	0.016–≥256	84.4	-	15.6
Ciprofloxacin	0.75	1	0.023–≥32	97.8	-	2.2
Levofloxacin	0.75	1	0.032–≥32	98.5	-	1.5
Moxifloxacin	0.125	0.19	0.016–≥32	98.5	-	1.5
Chloramphenicol	2	3	0.19–12	98.5	-	1.5
Tetracycline	0.25	32	0.047–≥256	83.7	-	16.3
TMP/SMX	0.094	2	0.012–≥32	83.7	8.9	7.4
Vancomycin	0.38	0.5	0.016–1	100	-	0.0
Linezolid	0.75	1	0.023–2	100	-	0.0
Quinupristin/dalfopristin	0.38	1	0.125–4	91.1	5.9	3
Tigecycline	0.047	0.25	0.016–1.5	99.3	-	0.7
Daptomycin	0.094	0.125	0.016–0.75	100	-	0.0

S, susceptible; I, intermediate; R, resistant; TMP/SMX, trimethoprim-sulfamethoxazole.