Patent ID: 7271251

Claim:
A test kit comprising a monospecific antisera that recognizes a BabA antigen and comprises an immunoglobulin that binds said BabA antigen via a variable region, wherein said Bab A adhesin protein comprises SEQ ID NO:5 and is produced using an isolated and purified bacterial blood group antigen binding protein (BabA) from Helicobacter pylori species, wherein said BabA protein binds specifically to fucosylated Lewis b type I and H-1 blood group antigen-glycoconjugates and, wherein said BabA protein contains less than 20% bacterial protein impurities, has a molecular weight in the interval of 70 to 77 kDa as determined by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE), and is not a HopA, HopB, HopC, HopD, or HopE protein.