TABLE 3.

Comparison of phenotypes and genotypes of erythromycin-resistant GBS isolatesa

PhenotypebGenotypeNo. of isolatesMIC (μg/ml)
ErythromycinClindamycin
90%Range90%Range
MmefA788-320.060.06-0.125
iMLSBermTR2216≥1,0240.250.06-0.25
cMLSBermB19≥1,0244-≥1,0241,0244-≥1,024
cMLSBermTR58256-≥1,024≥1,024512-≥1,024
cMLSBermTR, ermB1≥1,024≥1,024
cMLSBermTR, mefA1≥1,024≥1,024
LlinB10.068
Unknown20.06-0.1250.5-2
  • a A total of 55 isolates were tested.

  • b Abbreviations: M, efflux; iMLSB, inducible MLSB resistance; cMLSB, constitutive MLSB resistance; L, lincomycin nucleotidyltransferase.