Vaccination of piglets against Escherichia coli enteritis.

An immunisation procedure involving intraperitoneal followed by oral administration of a killed Escherichia coli vaccine was used to reduce losses associated with colibacillosis in young pigs reared under commercial conditions. Mortality was reduced in both the preweaning and postweaning period. The mortality rate among vaccinated piglets was half that of unvaccinated controls and by 3 weeks after weaning the total weight of pigs produced was 33% higher in the vaccinated group than in the control group.