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Antibody-dependent opsonophagocytic killing in the presence of anti-PspC IgG and neutrophil-like HL-60 cells. Graphs show percent survival of isogenic S. pneumoniae strains expressing one of the four PspC variants incubated with anti-PspC var.-II IgG. To determine the percentage of CFU that survived under each condition, CFU counts at the assay end time point were divided by the CFU counts at time point 0.
