> the share of severe cases seems to stay the same or even increase
I can't read the dashboard, but as I indicated this is what you would expect if you have a vaccine that broadly works at controlling the most severe forms of the disease. Vaccinated people whose infections manifest as nothing or a day or two of lethargy are not going to get counted in the statistics.
> I expected change in fatality rate
your expected change in the fatality rate needs to take into account that the real-world denominator has changed and that will not be apparent if you just divide number of fatalities by number of cases. (Because vaccinated people may be more likely to be asymptomatic, and we expect them to not get sick enough to ever present as a case.)
It's important to look at the number of people hospitalized or dying.
One again, out of population who are responsible for 90% of deaths (and 10% of cases), more than 80% are vaccinated. Everyone else, like 25%. This got to result in disproportionate change in number of cases and number of deaths.
I can't read the dashboard, but as I indicated this is what you would expect if you have a vaccine that broadly works at controlling the most severe forms of the disease. Vaccinated people whose infections manifest as nothing or a day or two of lethargy are not going to get counted in the statistics.
> I expected change in fatality rate
your expected change in the fatality rate needs to take into account that the real-world denominator has changed and that will not be apparent if you just divide number of fatalities by number of cases. (Because vaccinated people may be more likely to be asymptomatic, and we expect them to not get sick enough to ever present as a case.)
It's important to look at the number of people hospitalized or dying.