Virologists and laboratory doctors at the university Lübeck give a first attempt to estimate values at what accumulation of antibody immunity against Covid-19 can be assumed to exist. The international unit for measuring antibodies, is BAU (Bindign Antibody Units). Based on general virus experiences, experiences with Corona and Covid-19 and empirical data from Covid19 patient records, they say a BAU belows 21.8 means you have no immunity against Covid 19, whereas a BAU above 44 indicates you have. A BAU of 1000 means they advise that you do not go for a third refreshign jab. They admit everything between 21.8 and 44 is a grey zone that slowly gets scouted and specified.
I read it as that even if you are above 44, say 50, your immunitiy nevertheless may be weak. The higher the better, I assume.
You can get your antibody levels tested, for example after you recovered, or got vaccinated. Ask your doctor, its a simple blood test, AFAIK.
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