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JAC Advance Access originally published online on January 6, 2003
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Journal of Antimicrobial Chemotherapy (2003) 51, 409-414
© 2003 The British Society for Antimicrobial Chemotherapy

Two major Spanish clones of penicillin-resistant Streptococcus pneumoniae in Portuguese isolates of clinical origin

Manuela Caniça*, Ricardo Dias, M. Vitória Vaz-Pato and Catarina Carvalho

Antibiotic Resistance Unit, Centre of Bacteriology, National Institute of Health Dr. Ricardo Jorge, Av. Padre Cruz, 1649-016 Lisbon, Portugal

Received 31 July 2002; returned 18 September 2002; revised 25 September 2002; accepted 7 November 2002

We studied the genetic relatedness of 47 Portuguese penicillin-resistant 9V and 23F Streptococcus pneumoniae of clinical origin, using pulsed-field gel electrophoresis (PFGE) and restriction fragment length polymorphism analysis. PFGE fingerprinting showed that 24 isolates of serotype 9V and 23 isolates of serotype 23F were variants of the Spain9V-3 and Spain23F-1 clones, respectively. Fingerprinting of pbp1a, pbp2b and pbp2x genes showed that all the penicillin-resistant clones gave similar HinfI restriction patterns. In this study, serotypes 9V and 23F have different clonal origins and identical PBP genotypes, suggesting a horizontal transfer of resistance. Visual and computer-assisted analysis of PFGE patterns correlated well (r = 0.983).

Keywords: Streptococcus pneumoniae, Portugal, drug-resistant clones, genetic relatedness

* Corresponding author. Tel/Fax: +351-21-751-9246; E-mail: manuela.canica{at}insa.min-saude.pt


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