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Numbers of viable wild-type S. flexneri strain 2457T organisms after 2 h of incubation in different concentrations of sodium nitrite in tryptic soy broth at pH 4.5 (squares), 5.0 (circles), or 5.5 (triangles). Each data point represents the mean of three independent determinations. Error bars, ±1 standard deviation. Where error bars are not seen, the error bar was smaller than the symbol.
