Symbiotic microbes induce profound genetic changes in their hosts

Though bacteria are everywhere — from the air we breathe and the food we eat to our guts and skin — the vast majority are innocuous or even beneficial, and only a handful pose any threat to us. What distinguishes a welcome microbial guest from an unwanted intruder?

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<p><a href="http://www.physorg.com/news136483814.html">Symbiotic microbes induce profound genetic changes in their hosts</a></p> <p>Though bacteria are everywhere — from the air we breathe and the food we eat to our guts and skin — the vast majority are innocuous or even beneficial, and only a handful pose any threat to us. What distinguishes a welcome microbial guest from an unwanted intruder?</p>