Your immune system uses 50-million-year-old infections to keep you healthy

Your immune system uses 50-million-year-old infections to keep you healthy
At any given moment, your body hosts a number of different potential pathogens that could infect you, like viruses and bacteria. Your immune system acts like the bouncer at a bar that keeps the riffraff out.

March 4, 2016 at 10:09PM
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