Patterns of Macrolide Resistance Determinants among Community-Acquired Streptococcus pneumoniae Isolates over a 5-Year Period of Decreased Macrolide Susceptibility Rates

Abstract
Erythromycin resistance rates were found to be increased, from 7.1 in 1993 to 32.8% in 1997, among community-acquired Streptococcus pneumoniae isolates from the Siena area of central Italy. Most of the erythromycin-resistant isolates carried ermAM determinants and were also resistant to josamycin and clindamycin, whereas a minority (5.8%) carried mefA determinants and remained susceptible to the latter drugs.

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