Evaluation of Low-Colony-Number Counts of Mycobacterium tuberculosis on Solid Media as a Microbiological Marker of Cross-Contamination

• Autor(a) principal: Ribeiro, F. K. C.
• Data de Publicação: 2009
• Outros Autores: Lemos, E. M., Hadad, D. J., Leao, S. C. [UNIFESP], Viana-Niero, C. [UNIFESP], Dietze, R., Johnson, J. L., Eisenach, K. D., Palaci, M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: http://dx.doi.org/10.1128/JCM.00626-09; http://repositorio.unifesp.br/handle/11600/31534

Low-colony-number counts on solid media are considered characteristic of cross-contamination, although they are normally observed in true-positive cultures from some groups of patients. the aim of this study was to evaluate low-yield growth cultures as a microbiological marker for cross-contamination. We evaluated 106 cultures with < 15 colonies from 94 patients, and the proportions of false-positive cultures were 0.9% per sample and 1.1% per patient, which indicates that low-yield growth is not a reliable marker of cross-contamination.