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_Oman t1_ja4sxrg wrote

Even before COVID-19 there was evidence that fighting off a significant infection can cause a number of post-infection issues. Sometimes the damage is done by the infection, sometimes by the immune system fighting the infection, and sometimes the immune system can be dysfunctional after the infection. COVID-19 is unique in that is spread rapidly to a large portion of the population, and people had such a varied reaction to it.

Don't limit your research to COVID-19, although there has been a lot more research done in the past couple of years because of it.

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https://www.thelancet.com/journals/landia/article/PIIS2213-8587(22)00324-2/fulltext

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