does anyone know why the fatality rate was so high in Wuhan and then reduced ? Is that usual in an outbreak ?
I believe it was due to initial under identifying of mild cases. If you initially only recognise the severe cases the death rate will be higher. Eg if out of every 100 cases 10 are severe and 1 will die. If you just spot the severe ones then death rate will seem to be 10%. However once you see all the cases it would drop to 1%.
And with my experience of Swine Flu. In my family only 1 person out of 5 was diagnosed with it, and our GP didn't bother with the official test for them. However pretty much all of the rest of us had a "bug" around the same time, we just didn't have the spiking fever.