B_x, A Subtype of B

A subtype of B, termed B_x, was found to have serologic characteristics analogous to those described for subtype A_x. The B determinants of the erythrocytes and salivary secretions of the B_x person could be detected when anti-B was absorbed by and eluted from her red cells. These particularly reactive antibody molecules were best demonstrated by using acacia to support agglutination. Other described subtypes of B have been reviewed and reclassified in accordance with analogous criteria employed for subtypes of A. Evidence was found for two other examples of B_x as well as for B₃, B_m and B_g, but not for B₂.