True, I'm interested in getting some real data about the blood group and COVID-19 as well; I even planned to contribute data on it - https://news.ycombinator.com/item?id=23464244 incase me/my family got infected. Fortunately, it hasn't happened so far and I would like to have it that way!

Also in question are the true impact of Vitamin-D/C on immunity against COVID-19, it's now being treated as common knowledge by the medical fraternity in my region that Vitamin-D/C boosts immunity against COVID-19, so much so that the Vitamin-D/C tablets are being distributed as 'festival gift' via Public Distribution System.