| Abstract: | Guinea pigs were subcutaneously inoculated with 300 microgram of Brucella abortus strain 45/20 killed cells combined in 1% oil emulsion with trehalose dimycolate (TDM), muramyl dipeptide (MDP), or a combination of the 2 immunopotentiators. Protection, as determined by splenic infections in the guinea pigs after challenge exposure, was compared with that induced by strain 19 vaccine. With few exceptions, protection induced by bacterins containing 50 to 1,000 microgram of TDM or TDM-MDP/dose was comparable with that of strain 19 vaccine (P greater than 0.05). Bacterins that contained MDP as an adjuvant were inferior to those with TDM regardless of the excipient or method of preparation. There was no further enhancement of immunogenicity by the addition of MDP to bacterins that already contained TDM. Mineral oil could not be replaced by a metabolizable excipient in bacterins potentiated with TDM. |
