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Spontaneous rifampicin resistance in wild-type and sodB H. pylori. Resistance was assayed by colony counts at three concentrations of rifampicin (as indicated) after incubation at 2% O2 for 48 h. The data shown for the 5-μg/ml Rif level is the mean for two separate experiments. Results for the 2- and 10-μg/ml Rif levels are from single experiments.
