目 Mechanism of Action曹 Level of toxicity Work at extremely low levels; include strongest poisons known 1 g tetanus botulinus or Shiga toxin is enough to kill 10 million people 100-fold more is required for diptheria 1000-fold more for pseudomonas a BIOL 533 Lecture 9BIOL 533 13 Lecture 9 Mechanism of Action • Level of toxicity – Work at extremely low levels; include strongest poisons known • 1 g tetanus, botulinus, or Shiga toxin is enough to kill 10 million people • 100-fold more is required for diptheria • 1000-fold more for Pseudomonas A