All of my grandparents quarantined from before Purim. They are all locked in.
They all checked for anti-bodies and ALL of them have high levels of it. Which means they had the virus without symptoms and successfully fought it.
Also, one of them has a serious history with multiple heart surgeries and more. When he told his doctor that he has so much antibodies, his doctor refused to believe and told him to test again by a different lab. And yes, after testing again he got the same results.