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Numbers of CFU of viable intracellular wild-type, smooth Salmonella serovar Typhimurium and its rough (Ra) chemotype within neutrophils 1 h after taking up nonopsonized bacteria in the absence of serum. To inhibit NADPH oxidase activity, neutrophils were pretreated with 20 μM DPI. Values are means from three experiments (± standard deviations) performed in duplicate. *, P < 0.01 (compared to values for untreated bacteria; analysis by Student's t test).
