These data were in agreement with our previous data showing that PPD‐reactive CD3+ IFN‐γ+ Th1 cells were normally induced in both wild‐type C57BL/6 and IL‐17A KO mice on day 28 of the infection 9, although a decreased total number of CD3+ IFN‐γ+ T cells was observed in the lungs of the IL‐17A KO mice 10. This evidence concerns the gene IL17A and infection.