Hi Tam,I have a theory that people in underdeveloped nations have been already exposed to a large variety of bacteria and viruses, and may already be predisposed for heightened immunity to all diseases.
I'm not a medical worker , but from what I saw and experience ,Your theory has been proven to have some truth. People used to hardship and poverty may have develop some kind of immune system cause they're more expose to the element. Climate may also played a part as most of those underdeveloped nation are situated in the tropics or hot region.
And we will experience more of these, as the wealth gap between the haves and have not grew. If you lived in a big city , you will see it all around you, ghettos and homeless people living alongside the rich. Mother nature had a way of leveling the playing field by having the rich suffered more as they enclosed themselves in their secluded and air conditioned apartment or condo.
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