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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Viral infections can often be resolved by the body’s own immune system, which fights off the virus and clears it from the body. This process can take several days or even weeks, depending on the specific virus and the individual’s immune system. In the case of a common cold or the flu, the body’s immune system typically responds to the infection by producing inflammation, which helps to fight the virus and protect against further damage. This inflammation can cause symptoms like fever, which can be relieved with anti-inflammatory medications. As the body continues to fight the virus, the immune system becomes more effective at eliminating the virus, and the symptoms of the infection eventually start to improve. In some cases, the body may develop immunity to the virus, which means that it is better able to fight off future infections with that virus.

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