Peptide sequences from Kell, Duffy, and Kidd antigens were entered into the BLAST database as described in “Blast homology search with Kell, Kidd, and Duffy antigens.” Peptide identity and/or homology were detected for the indicated microbes. Red letters denote the predominant amino acids, whereas blue indicate polymorphisms. Green letters highlight amino acid variants between the blood group antigen and microbial amino acid sequences.