An easy clarification is that there are two main issues:
1. The % of the population that is HLA B27 positive (i.e. 5 - 10% approx. of Anglo Saxon ancestry, maybe as suggested 50% of Eskimos, etc.)
2. The % of the population that gets AS.
Just because the Eskimos have a higher % of HLA B27 pos. doesn't necessarily lead to them having a high % of pop. with AS. It simply means that if they are exposed to the trigger that sets of AS (and many believe that to be Klebsiella) then their population will also have a higher % of those with AS.
Don't think you can - KNOW YOU CAN
