Binding of anti-FHbp MAb JAR3 and anti-P1.16 PorA MAb 151,F-9 (10 μg/ml each) to live bacteria of group B strain H44/76-WT, as measured by flow cytometry. Solid black line, anti-FHbp chimeric human-mouse JAR3 IgG1 MAb; dashed black line, anti-PorA 151,F-9 IgG1 MAb; gray filled area, bacteria only. The binding of the anti-PorA MAb is ∼10-fold greater than the binding of anti-FHbp MAb.