title: Separation of serum bactericidal and opsonizing activities for Haemophilus influenzae type b.
abstract: When assay conditions permitted bacterial growth, immune serum had no bactericidal activity for Haemophilus influenzae but promoted rapid phagocytic killing of this organism by human leukocytes.
mesh_terms: D001770:Blood Bactericidal Activity; D006193:Haemophilus influenzae / Q000276:immunology*; D006386:Hemagglutination Tests; D006801:Humans; D007106:Immune Sera; D009895:Opsonin Proteins; D010587:Phagocytosis; D014465:Ultrasonics
chemical_list: D007106:Immune Sera; D009895:Opsonin Proteins