CD4 and infection: To check whether IL-23 affects the proportion of KLRG1+ effector T cells after vaccination with H1-DDA/TDB and Mtb challenge, we analyzed percentages of KLRG1+ cells within the CD44+CD4+CD90+ population in unvaccinated and vaccinated mice of the strains C57BL/6, IL-23p19−/−, and IL-17A−/− after infection with Mtb (Fig. 4b).