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PFGE types of ceftazidime-resistant Stenotrophomonas sp. isolates. Lane M, S. aureus ATCC 8325 size marker; lanes 1 and 2, S-2 strain isolated from a patient and an environmental culture, respectively, with indistinguishable PFGE profiles; lanes 3 and 4, S-1 and S-3 strains, respectively, isolated from environmental cultures, with different PFGE profiles.
