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Because a virus goes and attack a host body cell, making a person feel bad.

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14y ago
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13y ago

viruses attack the cells of their host. first they inject their DNA into the cell and go from there. Slowly it weakens the immune system and you get sick.

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13y ago

it makes you ill because it is not your own antibodies so you gain symptoms of the antibodies trying to dispose of the virus. if u need more information check on a biological website

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Q: How virus make humans sick?
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