Binding of TV to saliva detected by ELISA. (A) The 86 saliva samples were sorted according to their binding signals to TV within each of the four blood types: O, B, AB, and A. The levels of B type, A type, A type 3/4, H type 1, H type 2, H type 3/4, Leb, and Ley antigens in the saliva samples were determined by ELISA with corresponding specific MAbs. (B) Correlation analysis of binding activity of TV with HBGA levels in the saliva samples was performed. A significant positive correlation (r = 0.85; P < 0.05) between TV binding and the A type 3/4 antigen in the type A saliva was found.