Volume 6, Number 2—April 2000
Dispatch
Erythromycin Resistance in Streptococcus pyogenes in Italy
Matteo Bassetti*
, Graziana Manno*, Andrea Collidà*, Alberto Ferrando*, Giorgio Gatti*, Elisabetta Ugolotti*, Mario Cruciani†, and Dante Bassetti*
, Graziana Manno*, Andrea Collidà*, Alberto Ferrando*, Giorgio Gatti*, Elisabetta Ugolotti*, Mario Cruciani†, and Dante Bassetti*Table 1
In vitro susceptibilitya of Streptococcus pyogenes from 180 pharyngitis patients
| Erythromycin- | Erythromycin-resistant | |||
|---|---|---|---|---|
| susceptible | M-phenotype | IRb | CRc | |
| Erythromycin | 0.25 | 32 | 64 | >128 |
| Clarithromycin | 0.5 | 16 | 64 | >128 |
| Azithromycin | 0.25 | 16 | 64 | >128 |
| Clindamycin | 0.5 | 1 | 1 | >128 |
| Rifampin | 1 | 1 | 1 | 2 |
| Chloramphenicol | <#4 | <#4 | <#4 | <#4 |
| Ciprofloxacin | 0.25 | 1 | 2 | 2 |
a MIC90 in µg/ml.
bIR = Inducible-type resistance.
cCR = Constitutive-type resistance.
