Eli5 : How do viral infections phase out after 3-5 days?

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Say with covid or any regular influenza like infection, generally we are just prescribed anti inflammatory drugs for fever, and after a few days the infection phases out on its own.. how does that work?

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Some take longer, like Epstein-Barr, or don’t at all, like HIV. The ones that do, your body releases white blood cells to fight the virus, they eventually “learn” how to do it better or more effectively the more that they successfully kill. Eventually the virus gets overwhelmed and isn’t able to reproduce as fast as the antibodies are destroying them in combination with the fact that your body now knows how to handle them and it isn’t as much of a threat.

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