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In fact all invasors shall be identified by the body defenders as dangerous invaders, except those ones that are part of the body's normal living microorganisms like the gut flora for instance. They are lactobacillus found in yougurts.

If they are more aggresive, a lot of defenders are sent to the battle field to fight them.

There are no "friendly" invaders when the subject are microorganisms, except those ones mentioned above.

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Q: How does your bodys immune system identify dangerous germs?
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