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You never get something for nothing, especially not in health care. Every test, every incision, every little pill brings benefits and risks.
Nowhere is that balance tilting more ominously in the wrong direction than in the once halcyon realm of infectious diseases, that big success story of the 20th century. We have had antibiotics since the mid-1940s — just about as long as we have had the atomic bomb, as Dr. Martin J. Blaser points out — and our big mistake was failing long ago to appreciate the parallels between the two.