I thank you for your efforts. I applied for a new Wikidata property
entitled "Countries with high prevalence". This relation highlights which countries have a high prevalence of a particular gene or disease. You can find it in https://www.wikidata.org/wiki/Wikidata:Property_proposal/Countries_with_high_prevalence.
Please vote for it as it can provide an absolutely excellent advances to the field of epidemiology.