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Killing of bacteria by 90% fresh serum from subject 1 and 10% polyclonal anti-Factor B antibody (final concentration 0.92 mg/ml) (red circles), compared with 90% fresh serum from subject 1 and 10% PBS (green squares) and 100% heat-inactivated serum (black triangles) at 45, 90 and 180 minutes in the serum bactericidal assay using 106 cfu/ml S. Typhimurium D23580.
