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The purpose of the work was to assess the immunogenic features of the experimental batches of a combined vaccine Canivac FHL prepared by Biowet- -Pulawy. The leptaspiral component constituted of L. icterohaemorrhagiae and L. canicola serotypes inactivated with phenol, the addition of aluminium hydroxide served as an adjuvant. The examinations were performed in 3 farms free from leptospirosis and in...