Toxins EXotoxin A: mechaism like diphtheria toxin but much milder Two toxins are structurally and immunologically different Exoenzyme S: also ADP-ribosyltrnasferaser but heat stabile Found in 33. 3 clinical isolates BIOL 533 Lecture 13BIOL 533 8 Lecture 13 Toxins • Exotoxin A: mechaism like diphtheria toxin, but much milder – Two toxins are structurally and immunologically different • Exoenzyme S: also ADP-ribosyltrnasferase, but heat stabile – Found in 33.3% clinical isolates