This breakout just happened, for a year there has been remarkable success at keeping everyone here safe, the most recent breakout just started around two months ago.
Obesity...the lack thereof. Asian countries are notoriously some of the least obese countries on the planet. It shouldn't be surprising that their death rate relative to infection rate is lower than it has generally been in the west, which is home to some of the fattest people on earth.
Vietnam's obesity rate is 21.5%. The obesity rate in the US is 28.5. We rank 176th out of 196 countries, which is to say we're the 20th fattest country whereas Vietnam is 179th (ish) fattest country.
Africa is also generally a very 'thin' continent. But, there is one country that did see a larger death rate than its neighbors: South Africa. South Africa also happens to be one of the fattest countries in Africa. I think the fattest.