• Vol. 36 No. 8, 708–709
  • 15 August 2007

Of Worms and Men

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During its early development the human embryo may be considered an obligatory parasite, drawing its food and oxygen from the blood of the mother and bypassing all the immunological and other defense mechanisms of the latter. While subsequently leading independent lives, human beings, in turn, become the hosts of many a parasite.

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