Table 1.
Number of S. pyogenes strains isolated at first visit showing susceptibility and resistance to erythromycin and the distribution of different phenotypes
| Centers | Total organsims (n) | Susceptible (n) | Resistant (n) | Phenotypes |
||
|---|---|---|---|---|---|---|
| CRa | IRb | Mc | ||||
| Abbiategrasso | 6 | 6 | – | – | – | – |
| Alba–Bra | 30 | 23 | 7 | – | 2 | 5 |
| Alessandria | 39 | 24 | 15 | 9 | 2 | 4 |
| Bassano del G. | 36 | 30 | 6 | – | 3 | 3 |
| Bologna | 75 | 61 | 14 | 1 | 4 | 9 |
| Casorate | 45 | 42 | 3 | – | – | 3 |
| Catania | 191 | 157 | 34 | 11 | 11 | 12 |
| Catanzaro | 16 | 8 | 8 | 4 | – | 4 |
| Cava dei Tirreni | 31 | 27 | 4 | – | – | 4 |
| Chiavenna | 24 | 17 | 7 | – | 3 | 4 |
| Imola | 30 | 26 | 4 | – | 2 | 2 |
| Lecco | 55 | 40 | 15 | 6 | 3 | 6 |
| Magenta | 42 | 28 | 14 | 7 | 4 | 3 |
| Manerbio | 17 | 14 | 3 | 2 | – | 1 |
| Mantova | 86 | 41 | 45 | 10 | 12 | 23 |
| Melegnano | 70 | 54 | 16 | 9 | 3 | 4 |
| Milano F.B.F. | 28 | 23 | 5 | 2 | 3 | – |
| Milano P.A.T. | 48 | 36 | 12 | 3 | 2 | 7 |
| Napoli | 19 | 8 | 11 | 6 | 2 | 3 |
| Pinerolo | 11 | 2 | 9 | 1 | 5 | 3 |
| Salerno | 23 | 18 | 5 | 2 | 2 | 1 |
| Sondalo | 69 | 69 | – | – | – | – |
| Vercelli | 74 | 59 | 15 | 7 | 4 | 4 |
| Total | 1065 | 813 | 252 | 80 | 67 | 105 |
a
CR, constitutive-resistance phenotype.
b
IR, inducible-resistance phenotype.
c
M, new resistance phenotype.