We used only HlyE IgG and IgA to estimate seroincidence because lipopolysaccharide antibody responses were lower among S Paratyphi A cases (figure 1C) and we identified elevated lipopolysaccharide antibody responses among patients with invasive non-typhoidal Salmonellosis (appendix 4 p 11),21, 22 suggesting possible cross-reactivity. Here, CD79A is linked to salmonellosis.