SUMMARY The efficacy of three different formulations of vaccines against Aujeszky's disease was tested. Vacine I was formulated with antigen in oil, simple emulsion; vaccine II in oil, with a coadjuvam of cell immunity; vaccine III with the antigen plus DEAE-dextran (DEAE-d) as the adjuvant. Efficacy tests were conducted in 48 piglets, Landrace and Large White, divided in four groups of 12 animais. Each vaccine was applied in one group and another served as the control group. The piglets received two doses of 1ml of the vaccines, intramuscular, with 15 days interval. Twenty-one days after the second shot, the piglets were challenged with crescent doses of the vírus, log 10/ml (6.25, 7.25. 8.25 for the vaccinated and 4.25, 5.25, 6.25 for the controls) and four animais per dilution. The three vaccines conferred protection against the different concentrations of virus utilized: vaccine I protected 96.1%; vaccine II 90.9% and vaccine III protected 83.3%. The differences were statistically analyzed and not significant (p<0.05). The animais in the control group presented the clinical symptons of Aujeszky's disease although they had the smallest dose in the challenge test. There were also four tests conducted with rabbits and none of the vaccines conferred protection to them.
Aujeszky's disease; inactivated vaccines
