2scenta> Just because someone had covid in the past does not make them immune, there are a lot of people that got covid twice.
true, my hypothesis is that maybe first round creates some invisible damage in the body, making it easier to get seriously sick second time around. Also, statistically speaking, a person who got covid, is a person who is in a risky environment due to some combination of health status, work condition, housing situation, and personal stubbornness – as most of these, including stubbornness, do not usually improve from COVID, likelihood of a repeat are high. They should take at least one doze, I think.