Infrequent MODS TB culture cross-contamination in a high-burden resource-poor setting

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Abstract

One obstacle to wider use of rapid liquid culture-based tuberculosis diagnostics such as the microscopic observation drug susceptibility (MODS) assay is concern about cross-contamination. We investigated the rate of laboratory cross-contamination in MODS, automated MBBacT, and Lowenstein-Jensen (LJ) cultures performed in parallel, through triangulation of microbiologic (reculturing stored samples), molecular (spoligotype/RFLP), and clinical epidemiologic data. At least 1 culture was positive for Mycobacterium tuberculosis for 362 (11%) of 3416 samples; 53 were regarded as potential cross-contamination suspects. Cross-contamination accounted for 17 false-positive cultures from 14 samples representing 0.41% (14/3416) and 0.17% (17/10 248) of samples and cultures, respectively. Positive predictive values for MODS, MBBacT (bioMérieux, Durham, NC), and LJ were 99.1%, 98.7%, and 99.7%, and specificity was 99.9% for all 3. Low rates of cross-contamination are achievable in mycobacterial laboratories in resource-poor settings even when a large proportion of samples are infectious and highly sensitive liquid culture-based diagnostics such as MODS are used. © 2006 Elsevier Inc. All rights reserved.

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Moore, D. A. J., Caviedes, L., Gilman, R. H., Coronel, J., Arenas, F., LaChira, D., … Friedland, J. S. (2006). Infrequent MODS TB culture cross-contamination in a high-burden resource-poor setting. Diagnostic Microbiology and Infectious Disease, 56(1), 35–43. https://doi.org/10.1016/j.diagmicrobio.2006.03.009

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