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For the vaccination of healthy pregnant sows and gilts for passive transfer of maternal antibodies to their pigs. Protects against 4 strains of E. coli: K99, K88, 987P, F41 and the heat-labile toxin. Also protects against Clostridium perfringens Type C, which can cause a highly fatal enteritis in suckling pigs. Administer 2 ml IM or SQ. Give 2 doses, 3 weeks apart during the last half of pregnancy, with the 2nd dose at least 2 weeks prior to first farrowing. Give a single 2 ml booster at least 2 weeks prior to each subsequent farrowing.