The immune system can work in two ways: the innate immune system reacts to any foreign invaders that are identified by immune cells that look for such pathogens; but the acquired or adaptive immune system responds to an infection that it has encountered before, and now ‘remembers.’ Vaccines can help train the acquired immune system, so it has such a memory of an infection, without the body needing to actually be infected.
The Bacille Calmette-Guérin…
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News Source: www.labroots.com

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