ABOMASAL LYMPHATIC LYMPHOCYTE SUBPOPULATIONS IN CATTLE INFECTED WITH OSTERTAGIA-OSTERTAGI AND COOPERIA SP

Abomasal lymphatic cannulation was performed on steers naturally or ex perimentally infected with Ostertagia ostertagi and Cooperia sp.. Abom asal lymphatic lymphocyte subpopulations were evaluated using antibodi es specific for bovine mononuclear cell surface antigens, followed by flow cytometric analysis. W:hen compared with the non-infected or expe rimentally infected steers, naturally infected steers with. Type 1 or Type 2 ostertagiosis had increased percentages of B-lymphocytes. The p ercentages of B-lymphocytes were related to the numbers of O. ostertag i and Cooperia sp.. These findings are compatible with reports of worm -specific antibody synthesis in bovine nematodiases.