Detection of methicillin resistance in Staphylococcus aureus isolated from pediatric patients: is the cefoxitin disk diffusion test accurate enough?
Braz. j. infect. dis
; Braz. j. infect. dis;11(4): 415-417, Aug. 2007. tab
Article
em En
| LILACS
| ID: lil-460703
Biblioteca responsável:
BR1.1
ABSTRACT
We evaluated the performance of several methods for the detection of methicillin resistance in Staphylococcus aureus using 101 clinical S. aureus isolates from pediatric patients in a tertiary hospital in Brazil; 50 isolates were mecA-positive and 51 were mecA-negative. The Etest and oxacillin agar screening plates were 100 percent sensitive and specific for mecA presence. Oxacillin and cefoxitin disks gave sensitivities of 96 and 92 percent, respectively, and 98 percent specificity. Alterations of CLSI cefoxitin breakpoints increased sensitivity to 98 percent, without decreasing specificity. Our results highlight the importance of a continuing evaluation of the recommended microbiological methods by different laboratories and in different settings. If necessary, laboratories should use a second test before reporting a strain as susceptible, especially when testing strains isolated from invasive or serious infections. With the new (2007) CLSI breakpoints, the cefoxitin-disk test appears to be a good option for the detection of methicillin resistance in S. aureus.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Oxacilina
/
Staphylococcus aureus
/
Cefoxitina
/
Resistência a Meticilina
/
Antibacterianos
Tipo de estudo:
Diagnostic_studies
/
Evaluation_studies
Limite:
Child
/
Humans
Idioma:
En
Revista:
Braz J Infect Dis
/
Braz. j. infect. dis
/
Braz. j. infect. dis. (Online)
/
Brazilian journal of infectious diseases (Impresso)
Assunto da revista:
DOENCAS TRANSMISSIVEIS
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Brasil