But lets focus on a top few.
CFR is calculated as # dead ➗ # confirmed cases. If you test a lot, the bottom number gets bigger - so your % will get smaller! Germany & S Korea are doing *lots* of testing!
If only sick tested, bottom number gets smaller - % gets larger
#COVID19 doesn't kill suddenly - it takes days/weeks to die. So the # dead will always be a few weeks behind # cases. At beginning of outbreak this effect can be particularly strong as not as many people have died as will eventually
#COVID19 is most risky for elderly people. In countries were the population is older, or where its introduced more into elderly groups, the # deaths will be higher. This effect can be stronger at begin of epi, if elderly groups infected 1st
In places where the outbreak is very bad (Spain, Italy, Iran), hospitals are struggling to cope. They don't have enough staff/beds/supplies. This means people who might have been saved otherwise, will die - increasing the CFR.
Help do your part 2 reduce CFR: #StayHomeSaveLives!