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Análisis de los fenotipos y genotipos de resistencia a eritromicina y clindamicina en cepas de Streptococcus pyogenes aisladas en Chile en un período de 10 años / Resistance phenotypes and genotypes of Streptococcus pyogenes clinical isolates in Chile over a 10-year period
Rodríguez, Carlos; Rojas, Pablo; Wozniak, Aniela; Kalergis, Alexis M; Cerón, Inés; Riedel, Ingrid; Román, Juan C; Villarroel, Luis A; Berríos, Ximena; Bavestrello, Luis; García, Patricia.
  • Rodríguez, Carlos; Pontificia Universidad Católica de Chile. Escuela de Medicina. Departamento de Laboratorios Clínicos. Laboratorio de Microbiología. Santiago. CL
  • Rojas, Pablo; Pontificia Universidad Católica de Chile. Escuela de Medicina. Departamento de Laboratorios Clínicos. Laboratorio de Microbiología. Santiago. CL
  • Wozniak, Aniela; Pontificia Universidad Católica de Chile. Escuela de Medicina. Departamento de Laboratorios Clínicos. Laboratorio de Microbiología. Santiago. CL
  • Kalergis, Alexis M; Pontificia Universidad Católica de Chile. Facultad de Ciencias Biológicas. Departamento de Genética Molecular y Microbiología. Núcleo Milenio en Inmunología e Inmunoterapia. Santiago. CL
  • Cerón, Inés; Pontificia Universidad Católica de Chile. Escuela de Medicina. Departamento de Salud Pública. Santiago. CL
  • Riedel, Ingrid; Pontificia Universidad Católica de Chile. Escuela de Medicina. Departamento de Laboratorios Clínicos. Laboratorio de Microbiología. Santiago. CL
  • Román, Juan C; Pontificia Universidad Católica de Chile. Escuela de Medicina. Departamento de Laboratorios Clínicos. Laboratorio de Microbiología. Santiago. CL
  • Villarroel, Luis A; Clínica Reñaca. Viña del Mar. CL
  • Berríos, Ximena; Clínica Reñaca. Viña del Mar. CL
  • Bavestrello, Luis; Pontificia Universidad Católica de Chile. CL
  • García, Patricia; Pontificia Universidad Católica de Chile. Escuela de Medicina. Departamento de Laboratorios Clínicos. Laboratorio de Microbiología. Santiago. CL
Rev. méd. Chile ; 139(9): 1143-1149, set. 2011. ilus, tab
Article in Spanish | LILACS | ID: lil-612237
ABSTRACT

Background:

Macrolide and lincosamide resistance in Streptococcus pyogenes is due to the acquisition of mef, ermB and ermA genes, which confer different resistance phenotypes, namely M, MLSBconstitutive and MLSBinducible respectively. The last report of resistance in Chile was done in the period 1990-1998, in which resistance to macrolides was 5.4 percent, with M phenotype as the predominant one.

Aim:

To characterize the evolution of erythromycin and clindamycin resistance and their associated genes in S. pyogenes strains isolated from patients with invasive and non-invasive infections in the period 1996 to 2005. Material and

Methods:

Resistance to erythromycin and clindamycin was determined in 1,282 clinical isolates using the disk diffusion test. Resistant isolates were analyzed by polymerase chain reaction (PCR) for the presence of the above mentioned resistance genes.

Results:

Global resistance to erythromycin and clindamycin was 3.5 and 0.7 percent respectively. Eighty percent of the resistant strains possessed the M. phenotype.

Conclusions:

Resistance levels of S. pyogenes have decreased in Chile in the last years. Most resistant strains have M phenotype in contrast to many countries in which the MLSB constitutive phenotype is the predominant one.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Streptococcal Infections / Streptococcus pyogenes / Clindamycin / Pharyngitis / Erythromycin / Drug Resistance, Bacterial / Anti-Bacterial Agents Limits: Humans Country/Region as subject: South America / Chile Language: Spanish Journal: Rev. méd. Chile Journal subject: Medicine Year: 2011 Type: Article Affiliation country: Chile Institution/Affiliation country: Clínica Reñaca/CL / Pontificia Universidad Católica de Chile/CL

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Full text: Available Index: LILACS (Americas) Main subject: Streptococcal Infections / Streptococcus pyogenes / Clindamycin / Pharyngitis / Erythromycin / Drug Resistance, Bacterial / Anti-Bacterial Agents Limits: Humans Country/Region as subject: South America / Chile Language: Spanish Journal: Rev. méd. Chile Journal subject: Medicine Year: 2011 Type: Article Affiliation country: Chile Institution/Affiliation country: Clínica Reñaca/CL / Pontificia Universidad Católica de Chile/CL