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Serum antibody avidity against FL antigen. Avidity index for mice (solid points, n = 7) and rhesus (open points, n = 5) was calculated as the titre (OD = 1.0) in the presence of urea as a percentage of the titre in the PBS control. Bars represent mean avidity index ± SEM against FL antigen at 2 weeks post-third vaccination. P values are shown for statistically significant differences between CSP and Qβ-CSP determined by two-tailed t test
