https://ourworldindata.org/covid-deaths"Remember the question we asked at the beginning: if someone is infected with COVID-19, how likely is it that they will die? The answer to that question is captured by the infection fatality rate, or IFR."
The IFR is the number of deaths from a disease divided by the total number of cases. If 10 people die of the disease, and 500 actually have it, then the IFR is [10 / 500], or 2%.3,4,5,6,7
To work out the IFR, we need two numbers: the total number of cases and the total number of deaths.
"To understand the risks and respond appropriately we would also want to know the mortality risk of COVID-19 – the likelihood that someone who catches the disease will die from it."
If I catch this virus, I surely hope that infection fatality rates are dropping. And if the drop is a result of changes in treatment or appropriate responses, I'm all for it. Ventilators aren't used as they were initially when better outcomes were seen with different therapies.