BCG induced protection in the spleen and lungs of M. bovis challenged mice.

aExperiment 1, mice immunized 6 weeks prior to challenge: un-paired student's two-sided t - test ** ρbExperiment 2, mice immunized six weeks or one year prior to challenge: one-way ANOVA with Bonferroni post-test * ρ实验1：攻毒前6周免疫的小鼠，采用非配对双侧Student t检验（unpaired two-sided Student's t-test），检验结果标记为**ρ**；实验2：攻毒前6周或1年免疫的小鼠，采用辅以Bonferroni事后检验的单因素方差分析（one-way ANOVA with Bonferroni post-test），检验结果标记为*ρ*