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Journal of Clinical Microbiology, May 2009, p. 1290-1299, Vol. 47, No. 5
0095-1137/09/$08.00+0     doi:10.1128/JCM.02095-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

High-Throughput Molecular Determination of Salmonella enterica Serovars by Use of Multiplex PCR and Capillary Electrophoresis Analysis{triangledown}

Brandon T. Leader,1 Jonathan G. Frye,2 Jinxin Hu,1 Paula J. Fedorka-Cray,2 and David S. Boyle1*

Washington State Department of Health, Public Health Laboratories, Shoreline, Washington,1 Bacterial Epidemiology and Antimicrobial Research Unit, U.S. Department of Agriculture, Athens, Georgia2

Received 31 October 2008/ Returned for modification 20 December 2008/ Accepted 28 February 2009

Salmonella enterica is a leading cause of food-borne illness worldwide and is also a major cause of morbidity and mortality in domestic and wild animals. In the current study, a high-throughput molecular assay was developed to determine the most common clinical and nonhuman serovars of S. enterica in the United States. Sixteen genomic targets were identified based on their differential distribution among common serovars. Primers were designed to amplify regions of each of these targets in a single multiplex PCR while incorporating a 6-carboxyfluorescein-labeled universal primer to fluorescently label all amplicons. The fluorescently labeled PCR products were separated using capillary electrophoresis, and a Salmonella multiplex assay for rapid typing (SMART) code was generated for each isolate, based upon the presence or absence of PCR products generated from each target gene. Seven hundred fifty-one blind clinical isolates of Salmonella from Washington State, collected in 2007 and previously serotyped via antisera, were screened with the assay. A total of 89.6% of the isolates were correctly identified based on comparison to a panel of representative SMART codes previously determined for the top 50 most common serovars in the United States. Of the remaining isolates, 6.2% represented isolates that produced a new SMART code for a previously determined serotype, while the final 8.8% were from serotypes not screened in the original panel used to score isolates in the blinded study. This high-throughput multiplex PCR assay allowed simple and accurate typing of the most prevalent clinical serovars of Salmonella enterica at a level comparable to that of conventional serotyping, but at a fraction of both the cost and time required per test.

* Corresponding author. Present address: Program for Appropriate Technologies Diagnostics Group, 1455 NW Leary Way, Seattle, WA 98107. Phone: (206) 788-2032. Fax: (206) 285-6619. E-mail: dboyle{at}path.org

{triangledown} Published ahead of print on 4 March 2009.

Journal of Clinical Microbiology, May 2009, p. 1290-1299, Vol. 47, No. 5
0095-1137/09/$08.00+0     doi:10.1128/JCM.02095-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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