[hn_throwaway_99]

> But you cannot expect a vaccine to work similarly in people of two different regions having major differences in their diet, climate and lifestyles.

Can you? Do you have any examples of successful vaccines that are only given in one region because they have been proven ineffective in a different region?

[bluGill]

Cholesterol medication is given at lower doses to those with Asian background. Not a vaccine, and what is important is genetics not region.