Navegando por Palavras-chave "Blue-carba"
Agora exibindo 1 - 1 de 1
Resultados por página
Opções de Ordenação
- ItemAcesso aberto (Open Access)Avaliação comparativa de distintos métodos fenotípicos para a detecção de cepas produtoras de carbapenemases(Universidade Federal de São Paulo (UNIFESP), 2016-08-22) Moura, Jhonatha Rodrigo Cordeiro de [UNIFESP]; Gales, Ana Cristina [UNIFESP]; http://lattes.cnpq.br/8402272715765172; http://lattes.cnpq.br/2346858488495749; Universidade Federal de São Paulo (UNIFESP)During the last decade, it has been observed the rapid development of antimicrobial resistance among clinical isolates of Enterobacteriaceae, Pseudomonas spp., and Acinetobacter spp. worldwide. The production of ?-lactamases is the most important mechanism of resistance in Gram-negative bacilli, being the carbapenemases the most versatile mechanisms of carbapenem resistance. These enzymes have broad spectrum of activity, making difficult the selection of adequate antimicrobial therapy. Furthermore, genes encoding ?-lactamases are highly transmissible. Objective: This study aimed to evaluate the performance of five phenotypic methods for detection of carbapenemase-producing Gram-negative bacilli. Methods: Strains previously characterized were pulled out from the LEMC/ALERTA bank of microorganisms. The confirmation of carbapenemase production was performed by ertapenem hydrolysis using MALDI-TOF MS. The phenotypic tests evaluated were: Hodge modified test, ANVISA Technical Note 01/2013, Carba NP and its modification, CarbAcineto NP, Blue-Carba, CarbapenemBac, and CarbapenemBac Metallo. Results: Although the specificity rates of the ANVISA Technical Note and MHT were 100%, the Technical Note (97.3%) showed higher sensitivity rate than that of the MHT (88.5%) for carbapenemase detection. The Carba NP, Blue-Carba and CarbapenemBac tests showed high sensitivity and specificity rates (100%) when colonies subcultured on Mueller-Hinton agar were tested. The sensitivity and specificity rates of Carba NP (98.6 and 100%), BlueCarba (97.1 and 91%) and CarbapenemBac (96.5 and 100%) were slightly lower when bacterial colonies were obtained from blood agar. On the other hand, the sensitivity rates of Carba NP (71.1%) and Blue-carba (68.9%) were unacceptable when colonies obtained from MacConkey agar were evaluated. However, the sensitivity of CarbapenemBac (97.3% sensitivity) was less affected by the MacConkey agar. Conclusions: We conclude that 1. The colorimetric methods showed excellent sensitivity and specificity for carbapenemases detection when bacterial colonies were subcultured on Mueller-Hinton agar or blood agar; 2. Bacteria colonies subcultured on MacConkey agar must not be utilized for colorimetric tests, except for CarbapenemBac, which showed a good sensitivity and specificity rates for detection of carbapenemases independently of the culture medium used to subculture the bacterial isolate.