| Microorganism |
MIC50
(μg/ml) |
MIC90
(μg/ml) |
Range
(μg/ml) |
Antimicrobial |
Reference |
| Streptococcus (Group B) |
1 |
1 |
0.5 － 2 |
Linezolid (PNU-100766, U-100766, Zyvox)  |
1060 |
| Streptococcus (group B) |
>8 |
>8 |
0.12 － >8 |
Tetracycline (Sumycin, Achromycin V, Steclin) |
73 |
| Streptococcus (group B) |
500 |
- |
>500 － ? |
Kasugamycin |
1431 |
| Streptococcus (Group C + clinical isolate) |
- |
- |
8 － ? |
RRP9W4N |
1361 |
| Streptococcus (group C + erythromycin-susceptible) |
0.016 |
0.031 |
≤0.008 － 0.25 |
Telithromycin (HMR 3647, RU-66647, Ketek) |
502 |
| Streptococcus (group C + erythromycin-susceptible) |
0.031 |
0.063 |
≤0.031 － 0.063 |
Clarithromycin (Biaxin) |
502 |
| Streptococcus (group C + erythromycin-susceptible) |
0.031 |
0.063 |
≤0.031 － 0.063 |
Spiramycin |
502 |
| Streptococcus (group C + erythromycin-susceptible) |
0.063 |
0.063 |
≤0.031 － 0.125 |
Erythromycin (E-mycin, Ery-tab, Benzamycin) |
502 |
| Streptococcus (group C + erythromycin-susceptible) |
0.125 |
0.125 |
≤0.031 － 0.125 |
Clindamycin (Cleocin) |
502 |
| Streptococcus (group C + erythromycin-susceptible) |
0.125 |
0.25 |
0.063 － 0.25 |
Azithromycin (Zithromax, Sumamed, Zitrocin) |
502 |
| Streptococcus (group C + erythromycin-susceptible) |
1 |
2 |
0.5 － 2 |
Quinupristin/Dalfopristin (Synercid) |
502 |
| Streptococcus (Group C + macrolide-resistant + clinical isolate) |
- |
- |
8 － ? |
RRP9W4N |
1361 |
| Streptococcus (group C + mef(A)) |
0.125 |
0.125 |
0.063 － 0.125 |
Clindamycin (Cleocin) |
502 |
| Streptococcus (group C + mef(A)) |
0.25 |
0.5 |
0.031 － 0.5 |
Telithromycin (HMR 3647, RU-66647, Ketek) |
502 |
| Streptococcus (group C + mef(A)) |
1 |
2 |
0.5 － 4 |
Quinupristin/Dalfopristin (Synercid) |
502 |
| Streptococcus (group C + mef(A)) |
4 |
4 |
0.25 － 4 |
Clarithromycin (Biaxin) |
502 |
| Streptococcus (group C + mef(A)) |
4 |
4 |
0.25 － 4 |
Spiramycin |
502 |
| Streptococcus (group C + mef(A)) |
4 |
4 |
1 － 4 |
Azithromycin (Zithromax, Sumamed, Zitrocin) |
502 |
| Streptococcus (group C + mef(A)) |
4 |
8 |
1 － 8 |
Erythromycin (E-mycin, Ery-tab, Benzamycin) |
502 |
| Streptococcus (group C) |
0.03 |
- |
0.015 － 4 |
Erythromycin (E-mycin, Ery-tab, Benzamycin) |
248 |
| Streptococcus (group C) |
0.06 |
- |
0.008 － 2 |
Imipenem |
248 |
| Streptococcus (group C) |
0.06 |
- |
0.03 － 1 |
Penicillin (Benzylpenicillin, Penicillin G, Bicillin C-R/L-A, Pfizerpen, Wycellin) |
248 |
| Streptococcus (group C) |
0.06 |
- |
0.06 － 0.125 |
Clinafloxacin (PD 127391) |
248 |
| Streptococcus (group C) |
0.06 |
- |
0.06 － 0.125 |
PD 124816 |
248 |
| Streptococcus (group C) |
0.125 |
- |
0.06 － 0.25 |
Difluoroquinolone (PD 117596) |
248 |
| Streptococcus (group C) |
0.5 |
- |
0.03 － 16 |
Doxycycline (Doxycycline hyclate, Doxy, Vibra, Vibramycin) |
248 |
| Streptococcus (group C) |
1 |
- |
0.06 － 8 |
Cefazolin (Ancef, Kefzol, Zolicef) |
248 |
| Streptococcus (group C) |
1 |
- |
1 － 2 |
Ciprofloxacin (Cipro, Ciproxin, Ciprobay) |
248 |