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Antimicrobial Agents and Chemotherapy, May 2005, p. 2109-2111, Vol. 49, No. 5
0066-4804/05/$08.00+0     doi:10.1128/AAC.49.5.2109-2111.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Rapid Inversion of the Prevalences of Macrolide Resistance Phenotypes Paralleled by a Diversification of T and emm Types among Streptococcus pyogenes in Portugal

C. Silva-Costa, M. Ramirez,* J. Melo-Cristino, the Portuguese Surveillance Group for the Study of Respiratory Pathogens,

Laboratory of Microbiology, Molecular Microbiology and Infection Unit, Institute of Molecular Medicine, Lisbon Faculty of Medicine, Lisbon, Portugal

Received 26 November 2004/ Returned for modification 22 December 2004/ Accepted 3 January 2005

In Portugal erythromycin resistance of 26.6% (n = 352) remained constant during 1998 to 2003, however in 1998 the MLSB phenotype dominated (85%), whereas in 2003 the M phenotype prevailed (77%). A decline in T12/emm22 MLSB isolates could partially explain the drop in this phenotype, but the rise of the M phenotype was not due to clonal expansion.

* Corresponding author. Mailing address: Laboratory of Microbiology, Lisbon Faculty of Medicine, Av. Prof. Egas Moniz, PT 1649-028 Lisboa, Portugal. Phone: 351-21 799 9460. Fax: 351-21 799 9464. E-mail: ramirez{at}fm.ul.pt.

Antimicrobial Agents and Chemotherapy, May 2005, p. 2109-2111, Vol. 49, No. 5
0066-4804/05/$08.00+0     doi:10.1128/AAC.49.5.2109-2111.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Oliver, M. A., Garcia-Delafuente, C., Cano, M. E., Perez-Hernandez, F., Martinez-Martinez, L., Alberti, S. (2007). Rapid decrease in the prevalence of macrolide-resistant group A streptococci due to the appearance of two epidemic clones in Cantabria (Spain). J Antimicrob Chemother 60: 450-452 [Full Text]  
  • Friaes, A., Ramirez, M., Melo-Cristino, J., and the Portuguese Group for the Study of Streptoc, (2007). Nonoutbreak Surveillance of Group A Streptococci Causing Invasive Disease in Portugal Identified Internationally Disseminated Clones among Members of a Genetically Heterogeneous Population. J. Clin. Microbiol. 45: 2044-2047 [Abstract] [Full Text]  
  • Figueiredo, T. A., Aguiar, S. I., Melo-Cristino, J., Ramirez, M. (2006). DNA Methylase Activity as a Marker for the Presence of a Family of Phage-Like Elements Conferring Efflux-Mediated Macrolide Resistance in Streptococci. Antimicrob. Agents Chemother. 50: 3689-3694 [Abstract] [Full Text]  
  • Carrico, J. A., Silva-Costa, C., Melo-Cristino, J., Pinto, F. R., de Lencastre, H., Almeida, J. S., Ramirez, M. (2006). Illustration of a Common Framework for Relating Multiple Typing Methods by Application to Macrolide-Resistant Streptococcus pyogenes.. J. Clin. Microbiol. 44: 2524-2532 [Abstract] [Full Text]  


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