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Percentage of isolates giving a titer ≥1:8 to anti–5-component (5C) vaccine antiserum. Also shown are data for the respective percentages susceptible to the anti–factor H–binding protein (fHBP) variant (v.) 1 antiserum tested alone. A, fHBP v.1 isolates; B, fHBP v.2 or v.3 isolates. Error bars indicate 95% confidence intervals. Stippled bars, anti-5C antiserum; shaded bars, anti-fHBP v.1.
