Abstract
Bovine eosinophils survived for up to 48 hours in vitro in a medium of undiluted bovine serum and became adherent to the surface of Dictyocaulus viviparus larvae earlier than other cells found in peripheral blood. Cell adherence was associated with a heat labile factor in normal bovine serum and a heat stable factor in hyperimmune serum. A factor associated with leucocytes in vitro appeared to cause larval immobility. Cells from calves treated with levamisole behaved identically to those from other sources. It is suggested that eosinophils are an important element in host defence against D viviparus infection.
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