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Comparison of PCR Prescreening to Two Cultivation Procedures with PCR Confirmation for Detection of Mycobacterium avium subsp. paratuberculosis in U.S. Department of Agriculture Fecal Check Test Samples
Authors: Ellingson, Jay L.E.; Koziczkowski, Jeffrey J.; Anderson, Jennifer L.
Mycobacterium avium subsp. paratuberculosis (MAP) is the etiologic agent in Johne's disease in cattle and causes diarrhea, decreased milk production, emaciation, and frequently death. The ability to detect MAP rapidly and accurately is an integral part of herd management.
However, detection of this bacterium is complicated due to its slow division time and its ability to enter dormancy. Culture methods are considered the ''gold standard,'' but they have their limitations. Many enzymelinked immunosorbent assay methods and conventional PCR methods have been used
as diagnostic tools. The present study compares the results of a PCR prescreen to two culture methods of detection paired with confirmatory PCR to determine the most accurate, rapid, and sensitive method using U. S. Department of Agriculture (USDA) fecal check samples. This study involving
two laboratories (Marshfield Clinic Laboratories, using solid culture medium [Herrold's egg yolk agar], and TREK Diagnostic Systems Research and Development, using liquid culture medium [ESP Culture System II]) showed that the PCR prescreening method used in this study lacked specificity and
sensitivity as a stand-alone test in fecal samples. However, the combination of liquid enrichment culture using the ESP II system, and PCR confirmation with the hspX primer set, was not only 100% sensitive and specific but also correlated with viable MAP and USDA culture results.
Document Type: Short Communication
Marshfield Clinic Laboratories Food Safety Services, Marshfield Clinic, 1000 North Oak Avenue, Marshfield, Wisconsin 54449, USA
Publication date: October 1, 2004
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