The human micro-zoo

Scientists have begun to find tantalizing clues to the roles that different ecosystems of microbes play in keeping people healthy and making them sick. Read related article.

A look at microbes in the human body.
Sources: New York University, California Institute of Technology, National Institutes of Health, University of Maryland, CDC. Graphic: The Washington Post. Published on October 9, 2011, 7:39 p.m.
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