Each of us is home to approximately 100 trillion microbes, from 10,000 different species. They outnumber human cells 10-to-1 and together are called the microbiome. The National Institutes of Health’s Human Microbiome Project just last month released its initial map of a “normal” microbial makeup. Yet our microbes are under threat — and the enemy is us. More: Our microbes, ourselves.  (Illustration by Suzy Parker / USA TODAY)

Each of us is home to approximately 100 trillion microbes, from 10,000 different species. They outnumber human cells 10-to-1 and together are called the microbiome. The National Institutes of Health’s Human Microbiome Project just last month released its initial map of a “normal” microbial makeup.

Yet our microbes are under threat — and the enemy is us.

More: Our microbes, ourselves. 

(Illustration by Suzy Parker / USA TODAY)

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