In the second of this two-part series, Lionel Kelleway examines the on-going battle to control and eradicate parasites. Far from being simple hitch-hikers, parasites are remarkably sophisticated and successful organisms able to outwit immune systems and overcome the body's defence mechanisms. And, even if eradication of all parasites were possible, it may not be desirable, as some scientists suggest that we may need them as much as they need us.
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