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Phenotypes of erythromycin-resistant S. agalactiae isolates determined by the triple-disk test. The erythromycin disk (30 μg) is at the center, with the clindamycin disk (10 μg) on the right and the josamycin disk (30 μg) on the left. P1, cMLS phenotype; P2 and P3, iMLS phenotypes; P4, M phenotype.
