Four Examples of Bhm Blood in One Family

Abstract
During routine blood grouping, the patient's (L.S.) red cells typed as group O, but the serum lacked anti‐B agglutinins. Further investigation revealed that the red cells had no H antigen but did have a weak expression of B. The saliva contained both B and H in amounts comparable to normal B. Family studies provided evidence that this rare phenotype, designated Bhm, is recessive, dependent on a genetic locus possibly independent of, but linked to, the ABO locus.