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One hundred forty-seven isolates of Streptococcus pneumoniae with high-level penicillin resistance collected during a national surveillance program in the United States were characterized by serotyping, pulsed-field restriction analysis, ribotyping, and repetitive-sequence (BOX element) PCR. The results generated by each method were compared by frequency of association to examine whether relationships existed between the various typing methods and statistically to determine association with the geographic source of the isolate or the age of the patient from whom the isolate was obtained. When the data were examined by pairwise analysis of individual strain classifications produced by each typing method, no statistically significant relationships between strain type, geographic location, or patient age were identified, suggesting that distinct clones of penicillin-resistant S. pneumoniae have been widely distributed throughout the United States. However, we did observed shared expression of two or three typing markers at a high frequency (>50%) among clusters of strains, indicating a certain level of concordance between the various typing methods used to classify penicillin-resistant S. pneumoniae.

Original publication

DOI

10.1128/JCM.39.5.1791-1795.2001

Type

Journal article

Journal

Journal of clinical microbiology

Publication Date

05/2001

Volume

39

Pages

1791 - 1795

Addresses

Department of Pathology and Immunology, Washington University School of Medicine, 660 South Euclid Ave., Box 8118, St. Louis, MO 63110, USA. dunne@labmed.wustl.edu

Keywords

Humans, Streptococcus pneumoniae, Streptococcal Infections, Electrophoresis, Gel, Pulsed-Field, Bacterial Typing Techniques, Ribotyping, Serotyping, Polymerase Chain Reaction, Penicillin Resistance, Adolescent, Adult, Aged, Aged, 80 and over, Middle Aged, Child, Child, Preschool, Infant