In Good Health? Thank Your 100 Trillion Bacteria

[caption id="" align="alignleft" width="240" caption="Disease? (Photo credit: armigeress)"][/caption]

For years, bacteria have had a bad name. They are the cause of infections, of diseases. They are something to be scrubbed away, things to be avoided.

But now researchers have taken a detailed look at another set of bacteria that may play

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