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Antimicrobial Agents and Chemotherapy, September 2006, p. 3162-3165, Vol. 50, No. 9
0066-4804/06/$08.00+0     doi:10.1128/AAC.00269-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Increase of the M Phenotype among Erythromycin-Resistant Streptococcus pneumoniae Isolates from Spain Related to the Serotype 14 Variant of the Spain9V-3 Clone

C. Ardanuy,1* A. Fenoll,2 S. Berrón,2 L. Calatayud,1 J. Liñares,1 and the Spanish Pneumococcal Infection Study Network{dagger}

Servicio de Microbiología, Hospital de Bellvitge, Barcelona, Spain,1 CNM Instituto de Salud Carlos III, Madrid, Spain2

Received 3 March 2006/ Returned for modification 9 April 2006/ Accepted 11 June 2006

Between 1998 and 2003 the rate of erythromycin resistance among pneumococci in Spain was 34.4%. Although the MLSB phenotype was prevalent (94.7%), the rate of the M phenotype increased from 3.3% to 8.9% (P < 0.01). Clonal dissemination of mef(E)-carrying strains of serotype 14 variant of the Spain9V-3 clone was the major contributor to this increase.

* Corresponding author. Mailing address: Servicio de Microbiología, Hospital de Bellvitge, Feixa Llarga s/n, 08907 l'Hospitalet de Llobregat, Barcelona, Spain. Phone: 34 93 260 79 30. Fax: 34 93 260 75 47. E-mail: c.ardanuy{at}csub.scs.es.

{dagger} The members of the Spanish Pneumococcal Infection Study Network are provided in Acknowledgments.

Antimicrobial Agents and Chemotherapy, September 2006, p. 3162-3165, Vol. 50, No. 9
0066-4804/06/$08.00+0     doi:10.1128/AAC.00269-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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