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PFGE profiles of some drug-resistant S. pneumoniae clones isolated from children attending day care centers in Lisbon, Portugal. The λ ladder and R6 are indicated and were used as molecular weight markers. Clonal types of strains identical to PMEN representatives are designated by the PFGE code letter and the PMEN code between the brackets; other clonal types are designated by the serotype and PFGE code letter. NT, nontypeable.
