Laboratory tests in the detection of extended spectrum beta-lactamase production: National Committee for Clinical Laboratory Standards (NCCLS) screening test, the E-test, the double disk confirmatory test, and cefoxitin susceptibility testing



Document title: Laboratory tests in the detection of extended spectrum beta-lactamase production: National Committee for Clinical Laboratory Standards (NCCLS) screening test, the E-test, the double disk confirmatory test, and cefoxitin susceptibility testing
Journal: The brazilian journal of infectious diseases
Database: PERIÓDICA
System number: 000290842
ISSN: 1413-8670
Authors: 1



2
Institutions: 1Fundacao Faculdade Federal de Ciencias Medicas de Porto Alegre, Porto Alegre, Rio Grande do Sul. Brasil
2Irmandade Santa Casa de Misericordia de Porto Alegre, Laboratorio Central de Analises Clinicas, Porto Alegre, Rio Grande do Sul. Brasil
Year:
Season: Oct
Volumen: 8
Number: 5
Pages: 372-377
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Caso clínico
English abstract Extended spectrum beta-lactamase (ESBL) production by Klebsiella sp. and E. coli is an emerging problem. In this study, 107 clinical isolates (53 E. coli, 47 K. pneumoniae and 7 K. oxytoca) screened as ESBL producers by the NCCLS disk diffusion procedure were submitted to a double disk confirmatory test (DDT) and to the E-test double strip for confirmation of ESBL production by demonstration of clavulanic acid inhibition effect (CAIE). Only 72/107 (67%) of the isolates were confirmed as ESBL producers by DDT, with diverse results among species. By the E-test, 58/107 (54%) isolates were confirmed as ESBL producers, and 18/107 (17%) were not determinable. Susceptibility to cefoxitin was found in 57/68 (83%) of strains that did not show CAIE. ESBL detection remains a controversial issue and clinical laboratories are in need of a simple and effective way to recognize strains with this kind of resistance
Disciplines: Biología,
Química,
Medicina
Keyword: Bacterias,
Bioquímica,
Farmacología,
ESBL,
Cefoxitina,
Pruebas de sensibilidad,
Prueba de detección
Keyword: Biology,
Chemistry,
Medicine,
Bacteria,
Biochemistry,
Pharmacology,
ESBL,
Cefoxitin,
Susceptibility tests,
Screening test
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