highly significantp < 0.001
The experimental results showed that the antigen-specific IgG antibody titers in the sera of mice in both the Zera-71CA and Zera-PPE18 groups were significantly higher than those in the negative control and BCG-immunized groups on the 35th and 42nd days after immunization, and the results of the statistical analyses were highly significant ( p < 0.001).