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Journal of Clinical Microbiology, July 2004, p. 3169-3175, Vol. 42, No. 7
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.7.3169-3175.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Multiplex PCR Assay for Detection of Streptococcus suis Species and Serotypes 2 and 1/2 in Tonsils of Live and Dead Pigs

C. Marois,1* S. Bougeard,2 M. Gottschalk,3 and M. Kobisch1

Unité de Mycoplasmologie-Bactériologie,1 Unité d'Epidémiologie Porcine et Assurance Qualité, Agence Française de Sécurité Sanitaire des Aliments, 22440 Ploufragan, France,2 Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculté de Médecine Vétérinaire, Université de Montréal, St. Hyacinthe, Québec, Canada, J2S7C63

Received 9 February 2004/ Returned for modification 20 March 2004/ Accepted 31 March 2004

A PCR assay was developed for the detection of Streptococcus suis serotypes 2 and 1/2. This multiplex PCR is based on the amplification of the gene coding for 16S rRNA of S. suis and on the amplification of the cps2J gene coding for the capsule of S. suis serotypes 2 and 1/2. An internal control was constructed and added in this test to monitor the efficiency of amplification in each reaction. To evaluate the specificity of the test, 31 strains of other bacterial species related to S. suis or isolated from pigs and 42 strains of S. suis serotypes 1 and 3 to 34 were analyzed. The detection threshold of the test was 28 S. suis CFU/ml. The specificity and the sensitivity of the multiplex PCR test and the presence of an internal control allowed the analysis of biological samples without a culture step. The PCR assay was then applied to the detection of 14 S. suis serotype 1/2 strains, 88 S. suis serotype 2 strains isolated from pigs, and 25 S. suis serotype 2 strains isolated from humans. This test was also applied to analyze tonsil samples of pigs experimentally infected and carrier pigs without any symptoms.

* Corresponding author. Mailing address: Agence Française de Sécurité Sanitaire des Aliments, Unité de Mycoplasmologie-Bactériologie, BP53, 22440 Ploufragan, France. Phone: (33) 296010172. Fax: (33) 296016273 E-mail: c.marois{at}ploufragan.afssa.fr.

Journal of Clinical Microbiology, July 2004, p. 3169-3175, Vol. 42, No. 7
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.7.3169-3175.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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