Why does salmonella typhimurium cause inflammation?

Tetrathionate is S4O62-, but can be produced by the oxidation of thiosulphate (S2O32-). As it turns out, there's a lot of thiosulphate in the guts. Bacteria in the colon produce significant amounts of hydrogen sulphide (H2S), a very toxic gas, which is converted to the safer thiosulphate in the mucous membranes of the cecum.

Letter d i believe letter d