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  • Title: Monoclonal antibody in the identification of Haemophilus somnus.
    Author: Thomson MS, Lauerman LH, Wilt GR.
    Journal: J Vet Diagn Invest; 1990 Apr; 2(2):116-9. PubMed ID: 2094432.
    Abstract:
    Electrophoretic comparisons of outer membrane proteins of Haemophilus somnus isolates revealed 2 major protein bands (46 and 14 kilodaltons [kD]) common to all isolates tested. A monoclonal antibody raised against H. somnus reacted to the 46-kD band. Coagglutination tests were performed using a monoclonal antibody coagglutination assay. The monoclonal reagent was produced by incubating Cowan strain Staphylococcus aureus suspension, used as a source of crude protein A, with mouse ascitic fluid monoclonal antibody or goat anti-H. somnus hyperimmune serum. Bacteria to be tested were suspended at a concentration of 4.5 x 10(9) cells/ml. The coagglutination test was performed by the addition of 50 microliters of the monoclonal reagent to 50 microliters of the bacterial suspension on a glass plate and manual rotation for 2-3 minutes. The coagglutination assay using Cowan strain Staphylococcus aureus protein A, coupled with the monoclonal antibody, agglutinated 10 different H. somnus isolates. The antibody reagent did not coagglutinate with Actinobacillus suis, A. equuli, Pasteurella haemolytica, P. multocida, or P. pneumotropica under similar test conditions.
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