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. 1993 May;59(5):1473–1479. doi: 10.1128/aem.59.5.1473-1479.1993

Specific detection of Salmonella spp. by multiplex polymerase chain reaction.

J S Way 1, K L Josephson 1, S D Pillai 1, M Abbaszadegan 1, C P Gerba 1, I L Pepper 1
PMCID: PMC182106  PMID: 8517741

Abstract

Three sets of oligonucleotide primers were used in the polymerase chain reaction (PCR) assay to detect Salmonella species. phoP primers specific to the phoP/phoQ loci of coliform pathogenic bacteria such as Salmonella, Shigella, Escherichia coli, and Citrobacter species served as presumptive indicators of enteric bacteria. In addition to the phoP primers, the Hin and the H-1i primers, which targeted a 236-bp region of hin/H2 and a 173-bp region of the H-1i flagellin gene, respectively, were used. Both Hin and H-1i primers are specific to motile Salmonella species and are not present in Shigella, E. coli, or Citrobacter species. Thus, by multiplex PCR amplification, Salmonella species including Salmonella typhi, Salmonella typhimurium, Salmonella paratyphi A, and Salmonella enteritidis can be specifically detected. Optimal reaction conditions have been described to demonstrate this specific, sensitive detection of Salmonella species. By using agarose gel electrophoresis for detection of the PCR-amplified products, the sensitivity of detection was 10(2) CFU after 25 cycles of PCR and 1 (10(0)) CFU after a 50-cycle double PCR. The efficacy of these primers was demonstrated on environmental isolates which had previously been confirmed as Salmonella species by the use of conventional cultural techniques. In addition, positive amplifications resulted from Salmonella species in environmental samples including soil and water.

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