Information about the used bacterial strains, cattle and aspects of bioethics, Torin 1 chemical structure as well as methods for serological analysis (ELISA), preparation of peripheral blood mononuclear cells and flow cytometry, cytokine responses (IFN-γ), and statistical analysis may be found in Supplementary Materials. ELISAs (Fig. 1A) demonstrated that single immunization with the viral construct vaccine formulations did not significantly (P = 0.4–0.9 versus negative control group) increase the GMT of IgG antibodies against
the brucellosis Omp16 and L7/L12 proteins. In contrast, a significant (P < 0.0001) increase in the GMT of IgG antibodies against brucellosis antigens was observed in the positive control group (B. abortus S19) compared to the experimental see more groups during the period of observation. After booster vaccination of the experimental groups of cattle (Fig. 1B) significant accumulation of IgG antibodies against brucella proteins was only observed in animals
vaccinated with Flu-L7/L12-Omp16-MontanideGel01 (P = 0.005 and P = 0.0008 compared to Flu-L7/L12-Omp16 and Flu-L7/L12-Omp16-chitosan, respectively). Despite this, the accumulated IgG antibody titers in the group vaccinated with Flu-L7/L12-Omp16-MontanideGel01 were still significantly lower (P < 0.0001) than the positive control group. It should be noted that the ratios of IgG antibody isotypes in the experimental groups were significantly different to the positive control (B. abortus S19) group. IgG2a antibodies predominated in the cattle from the experimental groups, IgG1 antibodies predominated in the positive control group. Antigen almost specific cellular immune responses were formed, due to the fact that in the samples collected from the animals vaccinated with the viral construct vaccine formulations, the numbers of CD4+ and CD8+ (Fig. 2) cells after stimulation with Brucella L7/L12 and
OMP16 proteins were significantly higher (from P = 0.01 to P < 0.0001) than that of the control samples (without stimulation); the only exception was the Flu-L7/L12-Omp16-chitosan vaccine, in which the number of CD4+ cells after stimulation with Brucella proteins was not significantly different to the control samples after both prime (P = 0.07) and booster (P = 0.27) vaccination. Among the adjuvants tested, only Montanide Gel01 contributed significantly to stimulation of the T-cell immune response. After stimulation with Brucella antigens in vitro, the number of CD4+ and CD8+ cells in the samples from the animals vaccinated with vaccines containing Montanide Gel01 was significantly higher (from P = 0.01 to P = 0.0006) than the other experimental groups, and did not differ significantly to that of the positive control group vaccinated with B. abortus S19 (from P = 0.2 to P = 0.6).