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MHT on MHA (A) and on MHA added with zinc sulfate (100 μg/ml) (B). Organisms tested: 1, E. coli JM109; 2, K. pneumoniae COO (CTX-M-15 + porin loss); 3, K. pneumoniae BIC (OXA-48); 4, K. pneumoniae POZ (KPC-2); 5, E. coli GEN (NDM-1); 6, E. coli RIC (NDM-1); 7, E. coli ALL (NDM-1). Zinc sulfate improved the MHT for E. coli RIC and not for E. coli ALL.
