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S1-PFGE and Southern hybridisation of mcr-1 and bla NDM-1-bearing Escherichia coli strains and the corresponding transconjugants, Shenzhen, 2015–2017 (n = 2)
CTC: transconjugants selected with colistin; HB: Southern hybridisation; MTS: transconjugants selected with meropenem; PFGE: pulsed-field gel electrophoresis.
Both the mcr-1-bearing and the bla NDM-bearing plasmids could be transmitted to E. coli J53 under selective pressure of meropenem from strains 787, 977 and 1108.
