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Resistance of S. enteritidis isolates to paraquat. Resistance was assayed by the ability to grow in the presence of paraquat, and more resistant isolates show a smaller diameter of inhibition. Bars indicate the diameters of inhibitory zones of the S. enteritidis isolates on plates when a source of paraquat was placed in the center. Error bars indicate standard deviations; no error bar is shown for data with a standard deviation of 0.
