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Opsonophagocytic killing of PAO1 by dilutions of mouse and rabbit antisera raised against PAO1ΔaroA after i.n. immunization. Bars represent mean percent killing of two to four replicates relative to no-serum control, and error bars represent the standard errors of the means. Negative killing indicates growth during the 90-min incubation. Rabbit antiserum raised against heat-killed Fisher IT-7 by intravenous immunization served as a positive control.
