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PCR results of plasmid AmpC enzyme in E. coli and K. pneumoniae. 1 and 2, EBC positive control strains; 3 and 4, DHA-1 gene-positive; 5 and 6, CMY-2 gene-positive; 7, negative control; 8–10, EBC, DHA-1 gene and CMY-2 gene positive controls; M, molecular weight marker. PCR, polymerase chain reaction; E. coli, Escherichia coli; K. pneumoniae, Klebsiella pneumoniae.
