CD8A and typhoid fever: We and others have studied the relative contribution of serum antibodies, secretory IgA (SIgA), CD4+, CD8+, and other T-cell subsets (e.g., MAITs, TRM), including the interaction between T, B, and APC which together are likely to contribute to an effective immune response against typhoid fever [reviewed in Sztein et al., 2014].