Phenotypic and genotypic characterization of macrolide resistant Streptococcus pneumoniae recovered from adult patients with community-acquired pneumonia in an Argentinian teaching hospital.
Streptococcus pneumoniae isolates (n = 262) were recovered from adult patients with community-acquired pneumonia. Erythromycin-resistance levels increased from 9% (1997-1998) to 16% (2000-2002). Sampling for resistance mechanisms prevalent within 19 erythromycin-resistant S. pneumoniae showed mef(E) in 13/19 isolates while 4/19 carried the erm(B) gene (3/19 cMLS(B) and 1/19 iMLS(B) phenotype). MIC ranges for erythromycin and clindamycin were 0.5-16 mg/l and <0.008-0.063 mg/l for the M phenotype, 128-512 mg/l and 128-256 mg/l for the cMLS(B) phenotype, and 4 and <0.008 mg/l for the iMLS(B) phenotype. This is the first report studying the prevalence of macrolide resistance determinants in S. pneumoniae in our country.
Bonofiglio
L
L
Cátedra de Microbiología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, 1113, Junín 956, Argentina.
Ojeda
M I
MI
de Mier
C
C
Vay
C
C
Famiglietti
A
A
Gutkind
G
G
Mollerach
M
M
D000328:Adult; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001118:Argentina; D001426:Bacterial Proteins / Q000235:genetics; D002981:Clindamycin / Q000494:pharmacology; D017714:Community-Acquired Infections / Q000382:microbiology*; D024881:Drug Resistance, Bacterial / Q000235:genetics*; D004917:Erythromycin / Q000494:pharmacology; D005798:Genes, Bacterial; D005838:Genotype; D006784:Hospitals, Teaching; D006801:Humans; D018942:Macrolides / Q000494:pharmacology*; D008565:Membrane Proteins / Q000235:genetics; D008780:Methyltransferases / Q000235:genetics; D008826:Microbial Sensitivity Tests; D011018:Pneumonia, Pneumococcal / Q000382:microbiology*; D013296:Streptococcus pneumoniae / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification
D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D018942:Macrolides; C431304:MefE protein, Streptococcus pneumoniae; D008565:Membrane Proteins; D002981:Clindamycin; D004917:Erythromycin; C111078:ErmTR protein, bacteria; D008780:Methyltransferases