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Sia‐b1 and I antigens recognized by Mycoplasma pneumoniae‐induced human cold agglutinins

Postinfection cold agglutinins (CAs) with anti‐Sia‐b1 (i.e., anti‐Sialo‐ branched) specificity frequently occurring together with anti‐I CAs recognize antigenic determinants that are present on Oh red cells and are partially destroyed by endo‐β‐galactosidase on the red cell surface. They differ markedly from the monoclonal anti‐Sia‐b1 FI CA, which recognizes an epitope not expressed on Oh cells, and resistant to the enzyme. On the other side, Sia‐b1 determinants reacting with postinfection CAs share the characteristics of I determinants, with the exception that Sia‐b1 determinants require sialyl groups as an immunodominant component. Five sera containing coexisting anti‐Sia‐b1 and anti‐I CAs were tested against Oh and enzyme‐treated group O red cells. The results are consistent with a postinfection autoimmune response against a sialo‐type 2 structure common for Sia‐b1 and I determinants, which could serve as a receptor for Mycoplasma pneumoniae.