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| curl-6 said: It's not as cut and dried as that; antibodies naturally diminish over time as they're no longer needed once an infection is cleared; what's more important to lasting immunity are Memory T Cells and B Cells as these last much much longer and 'remember' past pathogens so that a fast and effective immune response can be mounted if it is ever encountered again. It's still not quite clear how long Acquired Immunity lasts for COVID, including after vaccination, but there is some evidence for lasting and durable immunity thanks to these memory cells. https://www.news-medical.net/news/20200908/Memory-B-cells-indicate-durable-immunity-in-COVID-19.aspx |
Unfortunately there is also evidence that people can get re-infected and even someone who died after getting covid-19 for a second time.
The problem is, it simply takes time to find this out.
