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Monoclonal antibodies (MAbs) were produced against pneumococcal capsular polysaccharides after subcutaneous immunization of BALB/c mice with a 23-valent vaccine (Pneumovax N, Merck, Sharp & Dohme). Selected antibodies were tested in ELISA against individual polysaccharides from 23 different pneumococcal types and in a dot blot assay with heat-killed whole bacteria adhered to nitrocellulose paper. Three MAbs (isotype IgM) were found to be specific for types 4, 8 and 22F, respectively, whereas one (isotype IgA) reacted both with 19A and 19F. Very mild acid hydrolysis of the capsular polysaccharides resulted in loss of reaction with the antibodies.
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