HEAT LABILE OPSONINS TO PNEUMOCOCCUS

Abstract
When encapsulated type 25 pneumococci (Pn25) were opsonized with normal guinea pig serum, they consumed much more C3 than other complement (C) components. Fixation of C3 to the organisms was demonstrated by radio-labeling techniques, and its capsular localization was established by the use of monospecific anti-C3 antibody.