Bacteria: Good or Bad?
Is bacteria good for you?
both good and bad. Without bacteria we would die, but
some bacteria could easily kill us: it all depends
which ones they are. The good ones, those we need to
survive, are there to digest our food (in our
intestines) and to live on our skin and in our mouth.
By doing so they provide a protection against bad
bacteria, that make you sick, and these are called
'pathogenic bacteria'. Those bugs take their chance if
your immune system is weakened, or if they manage to
get into your body in large amounts, by contaminated
food for instance.
Anyway, the simple question has a complicated answer.
If you're interested, read more about bacteria, both
good and bad, at www.bacteriamuseum.org
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Update: June 2012