CROSS-REACTIONS OF PNEUMOCOCCAL TYPES

Abstract

Data are given on the amounts of antibody N precipitated in the cross-reactions, often reciprocal, of the specific capsular polysaccharides of the pneumococcal type pairs II and XX, II and XIX, VII and XIV, VII and XVIII, VII and XIX, VIII and XVIII, VIII and XIX, X and XIV and X and XX. Since little is known of the fine structures of the polysaccharides of types VII, X, XIX and XX, there are no rigorous correlations between chemical structure and specificity.