That's why they got it.
And they travel, period.
Maybe I should have explained what I was referrencing. There was a Chinese study that showed people were far more likely to get the disease if they had A+ blood type which is most common among ethnic European groups and less common among most ethnic African populations (for example, 40% of American whites have A+ blood, while only 27% of American blacks do). It was a legitimate study of 2,100 people confirmed to have COVID-19, but of couse even studies can be wrong sometimes.
If it is correct, however, it would be entirely expected for there to be different rates of infection among different groups of people even at the same level of exposure. That’s all I was talking about (and a speculative article that had been posted to Free Republic on melanin as a protective anti-oxidant). We’ll probably see soon enough, but it seems a little early to say the very different infection and death rates so far are solely due to travel, although they certainly could be.