Macrolide susceptibility was investigated in clinical group B streptococci
obtained from neonates or pregnant women in 2000 in France. Of 490 consecut
ive isolates, 18% were resistant to erythromycin. The erm(B), erm(A) subcla
ss erm (TR), and mef(A) genes were harbored by 47, 45, and 6% of these stra
ins, respectively. Two isolates did not harbor erm or mef genes.