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Journal of Clinical Microbiology, November 1999, p. 3725-3730, Vol. 37, No. 11
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Genotypic Survey of Recent beta -Lactam-Resistant Pneumococcal Nasopharyngeal Isolates from Asymptomatic Children in Chile

Giovanni Gherardi,1 Jaime S. Inostrozo,2 Miguel O'ryan,3 Valeria Prado,3 Susana Prieto,3 Carolina Arellano,3 Richard R. Facklam,1 and Bernard Beall1,*

Respiratory Diseases Branch, Centers for Disease Control and Prevention, Atlanta, Georgia 30333,1 and Immunology Laboratory, Hospital Temuco, University of La Frontera, Temuco,2 and Microbiology Unit, Eastern Campus, School of Medicine, Universidad de Chile, Santiago,3 Chile

Received 7 June 1999/Returned for modification 2 August 1999/Accepted 17 August 1999

To assess pneumococcal strain variability among young asymptomatic carriers in Chile, we used serotyping, antibiotic susceptibility testing, and genotyping to analyze 68 multidrug-resistant pneumococcal isolates recovered from 54 asymptomatic children 6 to 48 months of age. The isolates represented capsular serotypes 19F (43 isolates), 14 (14 isolates), 23F (7 isolates), 6B (3 isolates), and 6A (1 isolate). Genotypic analysis, which included pulsed-field gel electrophoresis (PFGE) of chromosomal digests, penicillin binding protein (PBP) gene fingerprinting, and dhf gene fingerprinting, revealed that the isolates represented six different genetic lineages. Clear circumstantial evidence of capsular switching was seen within each of four of the genetically related sets. The majority of the isolates, consisting of the 43 19F isolates and 2 type 6B isolates, appeared to represent a genetically highly related set distinct from previously characterized pneumococcal strains. Each of three other genetically defined lineages was closely related to one of the previously characterized clones Spain6B-2, France9V-3, or Spain23F-1. A fifth lineage was comprised of four type 23F isolates that, by the techniques used for this study, were genetically indistinguishable from three recent type 19F sterile-site isolates from the United States. Finally, a sixth lineage was represented by a single type 23F isolate which had a unique PFGE type and unique PBP and dhf gene fingerprints.

* Corresponding author. Mailing address: Centers for Disease Control and Prevention, Mailstop C02, 1600 Clifton Rd., NE, Atlanta, GA 30333. Phone: (404) 639-1237. Fax: (404) 639-3123. E-mail: beb0{at}cdc.gov.

Journal of Clinical Microbiology, November 1999, p. 3725-3730, Vol. 37, No. 11
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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