Fig. 5From: Phenotypic zinc resistance does not correlate with antimicrobial multi-resistance in fecal E. coli isolates of pigletsComparison of MIC values for copper; multi-drug resistant and not multi-drug resistant isolates of both trials. A Mann–Whitney U test comparing 63 MDR isolates and 147 NMDR isolates (overall 210 isolates) showed no significant difference in the copper-MIC value between groups (P = 0.540)Back to article page