I find it interesting to note that the only places with a CFR in the single digits (as I have calculated it) are in Asia. I don't know what that means. It could be simply bad data reporting. Or it could be a genetic factor.
Designed into the virus?
And...
Might a country planning a bio-weapon attack, given the technology, release a less virulent strain among their own populace prior to the attack on their enemy? This would would serve as a smoke screen, as well as to inoculate the majority of its own population from the more virulent and deadly strain to be released upon their enemy, shortly after.
They may have thought the less virulent strain would develop immunity, but were surprised to find out it was partial immunity ? The more virulent was vectored to the Diamond Princess, Iran and Itay. Unfortunately just the cutouts. Intended targets being Japan, Canada and Europe.