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. 2001 May;45(5):1511–1514. doi: 10.1128/AAC.45.5.1511-1514.2001

TABLE 3.

MBC50s, MBC90s, and geometric mean MBCs of four antibiotics for S. milleri groupab

Drug and parameter μg/ml
S. intermedius S. constellatus S. anginosus
Penicillin
 MBC50 0.06 0.12 0.06
 MBC90 0.12 0.25 0.25
 Mean 0.06 0.12 0.07
Ampicillin
 MBC50 0.25 0.5 0.12
 MBC90 0.25 1.0 0.25
 Mean 0.19 0.39 0.10
Ceftriaxone
 MBC50 0.12 0.25 0.12
 MBC90 0.25 0.5 1.0
 Mean 0.12 0.30 0.24
Clindamycin
 MBC50 0.12 0.12 0.5
 MBC90 0.5 1.0 16
 Mean 0.17 0.18 0.62
a

Differences in MBCs among the three species were significant (P < 0.05) (Kruskal-Wallis test). 

b

MBC of penicillin for S. constellatus was greater than that for S. intermedius; MBC of ampicillin for S. constellatus was greater than those for S. intermedius and S. anginosus; MBC of ceftriaxone for S. constellatus was greater than that for S. intermedius; P < 0.05 for all comparisons (Mann-Whitney test); MBC of clindamycin for S. anginosus was greater than that for S. intermedius or S. constellatus (P < 0.05 for both comparisons) (Mann-Whitney test).