"28.1 per 100,000 population"
You are looking at the number for pregnant women I think.
Even still, I think you are misinterpreting.
28.1 per 100,000 is unselective, probably includes all living persons.
So grandmas, babys, kids, and all of those who are not sexually active.
So the risk, while still low, is higher than you would think on first glance.