CYBB and Salmonella Infections: Consistent with some residual oxidase activity in neutrophils, comparison of Salmonella infection in Eros−/− mice with those deficient in either gp91phox or p22phox showed that they had a slightly less severe defect in controlling bacterial replication than gp91phox or p22phox-deficient mice, which have no oxidase activity at all (Fig. S3 A).