TABLE 3.

Antibiotic susceptibilities of blood isolates of viridans streptococci^a

Antibiotic	No. of strains
	S. mitis (n = 25)	All non-S. mitis (n = 25)	Streptococcus sp. (n = 11)	S. parasanguis (n = 5)	S. salivarius, S. vestibularis (n = 3)	S. anginosus (n= 3)	S. gordonii, S. sanguis, S. sobrinus (n = 3)	Resistance comparisonb
Vancomycin	S25	S25	S11	S5	S3	S3	S3	NS
Linezolid	S25	S23/I2	S11	S4/I1	S3	S2/I1	S3	NS
Quin-dalfo	S24/I1	S23/I2	S11	S4/I1	S3	S2/I1	S3	NS
Ceftriaxone	S18/I4/R3	S23/I1/R1	S9/I1/R1	S5	S3	S3	S3	NS
TMP-SMZ	S14/I3/R8	S20/I1/R4	S9/I1/R1	S4/R1	S3	S2/R1	S2/R1	NS
Tetracycline	S15/I1/R9	S15/I2/R8	S6/I1/R4	S1/I1/R3	S3	S2/R1	S3	NS
Azithromycin	S9/I3/R13	S16/R9	S8/R3	R5	S2/R1	S3	S3	NS
Penicillin	S11/I7/R7	S14/I11	S7/I4	I5	S1/I2	S3	S3	P = 0.004
Gatifloxacin	S9/I2/R14	S16/I1/R8	S5/R6	S3/I1/R1	S2/R1	S3	S3	NSc
Levofloxacin	S8/I1/R16	S16/R9	S5/R6	S3/R2	S2/R1	S3	S3	P = 0.048
Ciprofloxacin	S4/I2/R19	S9/I3/R13	I2/R9	S2/I1/R2	S2/R1	S3	S2/R1	P = 0.077
R to ≥3 classes	14	3	2	1				P = 0.001

^aAbbreviations: S, susceptible; I, intermediate; R, resistant; NS, not significant; Quin-dalfo, quinupristin-dalfopristin; TMP-SMZ, trimethoprim-sulfamethoxazole.

^bS. mitis strains versus all non-S. mitis strains.

^cP = 0.048 when susceptible strains were compared (9/25 versus 16/25).