Evaluation of the FluoreslenS™ and fluorescence microscopy blinded rechecking trial, Nairobi, Kenya
Abstract:SETTING: Three busy laboratories in Nairobi, Kenya.
OBJECTIVES: To determine the performance of an affordable fluorescence system (FluoreslenS™) for tuberculosis microscopy, and to test an auramine-smear rechecking system.
DESIGN: Alternating routine use of Ziehl-Neelsen (ZN) and fluorescence microscopy (FM) was performed to compare detection and errors found while rechecking.
RESULTS: Overall, 19.5% of 25 250 ZN and 23% of 21104 FM smears were positive (P < 10−3). The proportional increment of FM over ZN was 18% (range −6%–29%), with one centre detecting fewer positives (non-significant, NS). The average error frequencies were comparable (1.8% vs. 2.6% false-negative and 0.2% vs. 0.4% high false-positive for ZN and FM, respectively, NS). The superior performance of controllers and the overall equal ZN/FM quality in the laboratories could be demonstrated only after converting error percentages to relative sensitivity (RS).
CONCLUSIONS: FM with the FluoreslenS system considerably improved sensitivity without loss of specificity in two of the busy routine laboratories, but the system is not sufficiently practical or user-friendly. Rechecking by FM can be done using guidelines for ZN smears, provided that routine ZN confirmation of positives is omitted. Calculation of RS allows an objective comparison of microscopy quality, independent of the variable prevalence of positives and sample size.
Document Type: Regular Paper
Affiliations: 1: Mycobacteriology Unit, Institute of Tropical Medicine, Antwerp, Belgium 2: National Leprosy and Tuberculosis Programme, Nairobi, Kenya 3: National Tuberculosis Reference Laboratory, Nairobi, Kenya 4: Mycobacteriology Unit, Institute of Tropical Medicine, Antwerp, Belgium; and International Union Against Tuberculosis and Lung Disease, Paris, France
Publication date: June 1, 2008
The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.
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