Lyophilized polyclonal rabbit Vibrio cholerae O1 antisera containing approximately 0.04% Thimerosal as a preservative. Difco™ Vibrio cholerae Antiserum Ogawa and Difco™ Vibrio cholerae Antiserum Inaba are monospecific absorbed antisera. When reconstituted and used as described, each vial contains sufficient reagent for 20 slide tests.