Biology
Biology, 25.10.2019 18:43, dondre54

As a child, you contracted hand, foot, and mouth disease, which is caused by a virus. several years later, your sibling also contracted the same virus. why don't you get sick a second time?

you have antibodies that already recognize the virus.
white blood cells released histamines and killed the virus.
your skin prevented the virus from entering your body.
stomach acid inactivated the virus, preventing its spread.

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As a child, you contracted hand, foot, and mouth disease, which is caused by a virus. several years...

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