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Contribution of serotypes to penicillin intermediate resistance and erythromycin resistance, in groups 1 and 2 (GR1 and GR2). (a) Number of penicillin intermediate isolates were 54/218 vs. 115/530 in GR1 and GR2, respectively. (b) Number of erythromycin-resistant isolates were 46/218 vs. 120/530 in GR1 and GR2, respectively.
