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Multi-Laboratory Evaluation of a Scrub Typhus Diagnostic Kit
Daryl J. Kelly
Daryl J. Kelly
U.S. Army Medical Research Unit, Institute for Medical Research, Walter Reed Army Institute of Research, Kuala Lumpur, Malaysia
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P. W. Wong
P. W. Wong
U.S. Army Medical Research Unit, Institute for Medical Research, Walter Reed Army Institute of Research, Kuala Lumpur, Malaysia
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Elsie Gan
Elsie Gan
U.S. Army Medical Research Unit, Institute for Medical Research, Walter Reed Army Institute of Research, Kuala Lumpur, Malaysia
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Chan Teik Chye
Chan Teik Chye
U.S. Army Medical Research Unit, Institute for Medical Research, Walter Reed Army Institute of Research, Kuala Lumpur, Malaysia
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David Cowan
David Cowan
U.S. Army Medical Research Unit, Institute for Medical Research, Walter Reed Army Institute of Research, Kuala Lumpur, Malaysia
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George E. Lewis, Jr
George E. Lewis, Jr
U.S. Army Medical Research Unit, Institute for Medical Research, Walter Reed Army Institute of Research, Kuala Lumpur, Malaysia
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Scrub typhus is a major cause of febrile illness throughout the Asia-Pacific region. It is commonly undiagnosed, partly because of the lack of a simple, reliable diagnostic test which can be used in clinical laboratories. The indirect immunoperoxidase technique, configured into a test kit, was provided to technicians who were trained in its use. They used the kit during a 2 year field trial in their respective clinical hospital laboratories throughout Malaysia. In an evaluation using 1, 722 consecutive sera tested in those laboratories, the kit was found to have a median sensitivity for IgG detection of 0.85 (range 0.33–0.95), a median specificity of 0.94 (range 0.88–1.00), reproducibility of 0.86, and efficiency of 0.92 when compared to the reference laboratory. In a proficiency survey in which 10 laboratories received 3 coded test samples, all but 2 laboratories had results within 1 dilution of the reference laboratory in quantitating specific IgG, whereas 7 laboratories were within 1 dilution in quantitating IgM. The shelf life of the kit was at least 1 year at 4°C.
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| Past two years | Past Year | Past 30 Days | |
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