CCR6 and typhoid fever: We found that, although MAIT cells coexpressing caspase-3 and either CCR6 or CCR9 markers were significantly higher in TD (during typhoid fever) than in NoTD (7–9 days after challenge) volunteers, no significant differences were observed when comparing low- and high-dose TD volunteers at 48–96 h (Figures 6D,E; Figure S18 in Supplementary Material).