Wrong place ; time: Bacteria are everywher. They protect us from bad bugs by crowding them out or not allowing them to take hold; produce bacteriocidal compounds; help us digest food ; make essential vitamins for us. Unfortunately some bugs are not 'friendly'. If our immune system isnt intact (skin breakdown, chemo, poor nutrition, burns, immune diseases) these bad bacteria overcome our immune system and attack us.
Answered 10/19/2013
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