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Journal of Clinical Microbiology, February 1999, p. 362-366, Vol. 37, No. 2
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Relatedness of Streptococcus suis
Serotype 2 Isolates from Different Geographic Origins as Evaluated
by Molecular Fingerprinting and Phenotyping
Sonia
Chatellier,1,
Marcelo
Gottschalk,1
Robert
Higgins,1
Roland
Brousseau,2 and
Josee
Harel1,*
Groupe de Recherche sur les Maladies
Infectieuses du Porc, Faculté de Médecine
Vétérinaire, Université de Montréal, C.P.
5000, St-Hyacinthe, Québec, Canada J2S
7C6,1 and
Biotechnology Research
Institute, Montreal, Québec, Canada H4P 2R22
Received 7 August 1998/Returned for modification 2 October
1998/Accepted 16 November 1998
The genetic diversity of 88 Streptococcus suis serotype
2 isolates which were recovered from various countries was examined by
randomly amplified polymorphic DNA (RAPD) analysis with three primers.
This bacterial collection included 80 isolates of porcine origin and 8 of human origin. This investigation allowed the identification of 23 RAPD types containing 1 to 30 isolates originating from one to six
countries. Common RAPD patterns were found between human and pig
isolates. The isolates were also tested for the production of virulent
factors such as hemolysin, muramidase-released protein (MRP), and
extracellular factor (EF). All isolates exhibiting the virulent
phenotype hemolysin+ MRP+ EF+
clearly clustered on the basis of fingerprinting by RAPD analysis. In a
similar way, most of isolates with the hemolysin
MRP
EF
phenotype were assigned to one RAPD
cluster. Therefore, RAPD clusters are more related to the phenotype
defined with hemolysin, MRP, and EF than to the geographic origin of
the isolates. These data indicate that RAPD analysis used in
conjunction with phenotypic methods provides a reliable method for the
assessment of the clonal relationship between S. suis
isolates responsible for infections in pigs or humans, especially for
those exhibiting the classic "virulent" phenotype
hemolysin+ MRP+ EF+.
*
Corresponding author. Mailing address: Groupe de
Recherche sur les Maladies Infectieuses du Porc, Département de
Pathologie et Microbiologie, Faculté de Médecine
Vétérinaire, Université de Montréal, C.P. 5000, Saint-Hyacinthe, Québec, Canada J2S 7C6. Phone: (450)
773-8521, ext. 8233. Fax: (450) 778-8108. E-mail: harelj{at}ere.umontreal.ca.

Present address: Research Service, Veterans Affairs Medical Center,
Memphis, TN
38104.
Journal of Clinical Microbiology, February 1999, p. 362-366, Vol. 37, No. 2
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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