Fowl Cholera in Turkeys: The Efficacy of Adjuvant Bacterins

Abstract

All 4 bacterins conferred significant immunity in turkeys to experimental fowl cholera. Heat-inactivated bacterin containing type-A Pasteurella multocida strain gave better immunity in turkeys than formalinized bacterins, as indicated by higher survival and lower recovery rates of Pasteurella organisms from the survivors. No clear-cut differene in immunizing efficiencies between oil-adjuvant and aluminum hydroxide bacterins could be established. The hemagglutination test did not clearly indicate the immune status of the birds that were vaccinated and exposed to virulent P. multocida cultures. Serum of immune turkeys did not induce passive immunity in adult mice.