title: Increase of the M phenotype among erythromycin-resistant Streptococcus pneumoniae isolates from Spain related to the serotype 14 variant of the Spain9V-3 clone.
abstract: Between 1998 and 2003 the rate of erythromycin resistance among pneumococci in Spain was 34.4%. Although the MLS(B) 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 Spain(9V)-3 clone was the major contributor to this increase.
authors.affiliation: Servicio de Microbiología, Hospital de Bellvitge, Barcelona, Spain. c.ardanuy@csub.scs.es
authors.forename: C
authors.initials: C
authors.lastname: Ardanuy
authors.forename: A
authors.initials: A
authors.lastname: Fenoll
authors.forename: S
authors.initials: S
authors.lastname: Berrón
authors.forename: L
authors.initials: L
authors.lastname: Calatayud
authors.forename: J
authors.initials: J
authors.lastname: Liñares
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001426:Bacterial Proteins / Q000235:genetics; D024881:Drug Resistance, Bacterial; D004917:Erythromycin / Q000494:pharmacology*; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics; D011008:Pneumococcal Infections / Q000453:epidemiology / Q000382:microbiology; D013030:Spain / Q000453:epidemiology; D013296:Streptococcus pneumoniae / Q000145:classification* / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; C117866:MefA protein, Streptococcus; D008565:Membrane Proteins; D004917:Erythromycin