Annals of Clinical Microbiology, The official Journal of the Korean Society of Clinical Microbiology


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pISSN 2288-0585 eISSN 2288-6850

Genomic Characteristics and Identification of Salmonella enterica serovars Typhi and Paratyphi A Using Multiplex PCR

Original article

Annals of Clinical Microbiology (Ann Clin Microbiol) 2007 April Volume 10, Issue 1, pages 6-13

Genomic Characteristics and Identification of Salmonella enterica serovars Typhi and Paratyphi A Using Multiplex PCR

Ji-Young Moon1, Yung-Bu Kim1, Chulhun L. Chang2
Departments of 1Microbiology and Immunology, 2Clinical Pathology, College of Medicine, Pusan National University, Busan, Korea


Background: Salmonella enterica serovars often have a broad host range and cause some gastrointestinal and systemic diseases. The diagnosis of typhoid fever or paratyphoid fever is made by ordinary culture methods and biochemical tests. However, a more rapid and alternative method of diagnosing these diseases is in need since the classical diagnostic method requires several days for a result. Some researchers have already reported serovar Typhi detection methods with PCR using the fliC-d gene and the Vi capsular antigen gene.

Methods: Thirty-six Salmonella strains isolated at Pusan National University Hospital from 1997 to 2004 were used for a rapid identification of S. enterica serovars Typhi and Paratyphi A with multiplex PCR that uses the O (rfbE, rfbS), H (fliC-d, fliC-a), and Vi (viaB) antigen genes. To further characterize these Salmonella strains, we used PCR to detect genes (invA and enterotoxin) for proposed virulence factors and performed antimicrobial susceptibility testing, serotyping and pulsed-field gel electrophoresis for epidemiological characteristics.

Results: Most strains were resistant to ampicillin. By PCR, tyv, prt, fliC-d and viaB genes were detected in serovar Typhi, whereas only fliC-a and prt genes were found in serovar Paratyphi A. In addition, invA and enterotoxin genes were detected in both strains.

Conclusion: This method enabled us to identify and differentiate serovars Typhi and Paratyphi A by only a single PCR assay. That is, clinically important human pathogens were more rapidly and specifically detected and identified with multiplex PCR. (Korean J Clin Microbiol 2007;10:6-13)


Salmonella enterica serovar Typhi and Paratyphi, Multiplex PCR, Genotype