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Absence of the OXA-24 gene in different carbapenem-susceptible IMSAB strains by PCR amplification with P1 and P2 OXA primers. Lanes 1 and 11, molecular weight marker λIII (Boehringer); lane 2, A. baumannii RYC 52763/97 as the positive control; lanes 3 and 4, two epidemic genetically related IMRAB strains; lanes 5 through 10, different genetically unrelated carbapenem-susceptible IMSAB strains.
