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The Hygiene Hypothesis, Part 3. Are Parasitic Worms Friend or Foe?
... damages our own tissues in the process. We also learned how helminths like pig whipworm might constitute an exciting ... . The question we're now looking at is: why? 'Why' questions in biology require evolutionary explanations; it is ... system has also evolved an elaborate control system to stop it from getting out of hand and causing excessive damage ...