Here we see that the overall decrease is much lower, with the non-PCV7 bacteria taking up a lot of the slack left by the bacteria that were vanquished by the vaccine.

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The 42-year-old secretary and mother of three in Chandler, Arizona, had developed a nasty intestinal infection, the kind that sometimes occurs when antibiotics kill your body's good bacteria along with the bad and lower your defenses to other invaders.

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