In studying about pandemics and plagues I learned this relatively recently.
First of all, European genetics carry Neaderthal blood which is very very strong immunologically of 3% to up to 6%. This is a major factor.
On top of this plagues of various kinds from 500 years before Christ to the early 1900s and beyond killed hundreds of millions of people (possibly as many as 700 million to 1 billion people total).
So, this is why the ONLY ones who survived all this had incredible immune systems and then passed it onto their descendants. Some of these pandemics killed off 95% of all people they touched.
Because of all this Europeans and their descendants tend to have the best immune systems on earth.
For example, when Europeans first came to America 90% of native americans here or 90 million of them died within the first 50 years of contact with any white people at all. the first were the trappers who first met with Indians and this killed 90% of them within a few months from flu and colds and smallpox.
Europeans had natural immunities to these things but were also carriers of these diseases much like young healthy people are carriers of coronavirus and are killing their parents and grandparents because they are too young to be very disciplined about their behaviors.
However, after they accidentally from non-discipline kill their parents and grandparents and aunts and uncles they might be. Because they likely will have to carry this guilt the rest of their lives, unfortunately.
This is just the way life actually is these days.
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