Patent ID: 8911743

Claim:
A method for detecting the presence of an antibody against Haemophilus parasuis in a biological sample from an animal, comprising: mixing the biological sample from the animal with a polypeptide under conditions suitable for formation of an antigen: antibody complex, said biological sample containing an antibody against Haemophilus parasuis , wherein the polypeptide comprises an amino acid sequence having at least 80% identity with SEQ ID NO:2, wherein the antibody binds to an oligopeptide permease OppA of Haemophilus parasuis as set forth in SEQ ID NO:2, wherein the polypeptide has oligopeptide permease activity, wherein the animal is selected from the group consisting of porcine, avian, bovine, caprine, ovine, equine, murine, human, and a companion animal; and detecting the complex, wherein the presence of the complex indicates the animal has antibody that specifically binds to the polypeptide.