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Journal of Antimicrobial Chemotherapy (2002) 50, 249-252
© 2002 The British Society for Antimicrobial Chemotherapy

Conjugative transfer of the erm(A) gene from erythromycin-resistant Streptococcus pyogenes to macrolide-susceptible S. pyogenes, Enterococcus faecalis and Listeria innocua

E. Giovanetti, G. Magi, A. Brenciani, C. Spinaci, R. Lupidi, B. Facinelli and P. E. Varaldo*

Institute of Microbiology, University of Ancona Medical School, Via Ranieri, Monte d’Ago, 60131 Ancona, Italy

Received 1 November 2001; returned 31 January 2002; revised 26 March 2002; accepted 23 May 2002

In mating experiments, the erythromycin resistance methylase gene erm(A) was successfully transferred from erm(A)-positive clinical isolates of Streptococcus pyogenes to macrolide-susceptible recipients of S. pyogenes, Enterococcus faecalis and Listeria innocua. Compared with the SmaI macrorestriction pattern of the S. pyogenes recipient, the patterns of S. pyogenes transconjugants shared the lack of a fragment and the appearance of a new, larger fragment. This is the first experimental evidence that the erm(A) gene can be transferred from erythromycin-resistant S. pyogenes to macrolide-susceptible S. pyogenes as well as to other Gram-positive recipients.

* Corresponding author. Tel: +39-071-2204694; Fax: +39-071-2204693; E-mail: pe.varaldo{at}popcsi.unian.it


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