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Laboratory Cross-Contamination of Mycobacterium tuberculosis: A Systematic Review and Meta-analysis.

Abstract：

BACKGROUND:Microbiological cultures are the mainstay of the diagnosis of tuberculosis (TB). False-positive TB results lead to significant unnecessary therapeutic and economic burden and are frequently caused by laboratory cross-contamination. The aim of this meta-analysis was to quantify the prevalence of laboratory cross-contamination. METHODS:Through a systematic review of five electronic databases, we identified studies reporting rates of laboratory cross-contamination, confirmed by molecular techniques in TB cultures. We evaluated the quality of the identified studies using the National Institute of Health (NIH) Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies, and conducted a meta-analysis using standard methodology recommended by the Cochrane Collaboration. RESULTS:Based on 31 eligible studies evaluating 29,839 TB cultures, we found that 2% (95% confidence intervals [CI] 1-2%) of all positive TB cultures represent false-positive results secondary to laboratory cross-contamination. More importantly, we evaluated the rate of laboratory cross-contamination in cases where a single-positive TB culture was available in addition to at least one negative TB culture, and we found a rate of 15% (95% CI 6-33%). Moreover, 9.2% (91/990) of all patients with a preliminary diagnosis of TB had false-positive results and received unnecessary and potentially harmful treatments. CONCLUSIONS:Our results highlight a remarkably high prevalence of false-positive TB results as a result of laboratory cross-contamination, especially in single-positive TB cultures, leading to the administration of unnecessary, harmful treatments. The need for the adoption of strict technical standards for mycobacterial cultures cannot be overstated.

journal_name

Lung

journal_title

Lung

authors

Barac A,Karimzadeh-Esfahani H,Pourostadi M,Rahimi MT,Ahmadpour E,Rashedi J,Mahdavipoor B,Kafil HS,Spotin A,Abate KH,Mathioudakis AG,Asgharzadeh M

doi

10.1007/s00408-019-00241-4

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

651-661

issue

5

eissn

0341-2040

issn

1432-1750

pii

10.1007/s00408-019-00241-4

journal_volume

197

pub_type

杂志文章,meta分析

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