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Antibody responses presented as mean percent positivity values in cattle following immunization (IMM) with live tachyzoites or whole-tachyzoite lysate 10 weeks prior to artificial insemination and challenged with a fetopathic infection of N. caninum Nc Liv tachyzoites 19 weeks after the first immunizing dose. ⧫, group 1 (challenge control); ▪, group 2 (live immunization); ▴, group 3 (lysate plus VSA3); ×, group 4 (lysate plus QuilA); □, group 5 (adjuvant control).
