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Opsonophagocytic titers against P. aeruginosa serogroup O2/O5 strains in pooled sera from actively or passively PAO1ΔaroA-immunized C3H/HeN mice. Titers were determined by linear regression and are expressed as the reciprocal dilution of sera mediating 50% killing. Error bars represent the 95% confidence intervals. n.d., not determined.
