Bactericidal activity of NHS remains intact in the presence of anti-FH.07. (A) E coli CFUs/mL were determined after incubation in 75% (vol/vol) NHS, NHS preincubated with anti-FH.07, NHS preincubated with eculizumab, or HI-NHS. (B) CFUs/mL of 2 clinical isolates of N meningitidis serogroup B (left) and serogroup W (right), determined after incubation in 75% (vol/vol) NHS, NHS preincubated with anti-FH.07, NHS preincubated with eculizumab, or HI-NHS. All data are presented as mean with standard deviation (n = 3). **P < .01, ****P < .0001, 2-way ANOVA.