Abstract
Hereford cattle were immunized with membranes and soluble components extracted from the midgut of Boophilus microplus. Membrane vaccines protected cattle (91%) against challenge with 3 x 20,000 larval ticks administered at intervals of 7 days. Vaccines made from soluble antigens did not protect cattle. Antibody levels measured by enzyme-linked immunosorbent assay (ELISA) related to the levels of protection induced by vaccination.
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