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Metronidazole susceptibility in 197 isolates stratified by ntrTv genotype. Intact open reading frames (ORFs) are represented by +, and the presence of stop codons is indicated by −. Horizontal bars represent median values. Isolates with a range of MLC values (e.g., 100 to 200 μg/ml) are plotted using their mean MLC values. Isolates with an MLC value of >400 μg/ml are assigned a value of 800 μg/ml for display purposes. *, P < 0.05; **, P < 0.01; and ***, P < 0.001.
