we measured the uptake by human neutrophils of radiolabeled s. pneumoniae opsonized with either complement-intact , complement-depleted ( by heat inactivation ) , or alternative complement pathway-activated ( by magnesium dichloride-ethylene glycol tetraacetic acid ( mgegta ) chelation ) immune sera with varying concentrations of antibody from individuals immunized with polyvalent pps vaccine .
C0020960
immune sera
C0003241
antibody