Its really very simple. It is called mathematics. The case fatality rate is the percentage of confirmed cases that result in death. The current observed case fatality rate in the US is 4059 deaths/188,647 confirmed cases = .0215 which is the same as 2.15 %. In other words, as of now 2.15% of individuals known to have contracted covid-19 have died from it. Here is the source for that figure: https://www.worldometers.info/coronavirus/#countries During the H1N1 "swine flu" pandemic the CDC estimated that there had been 60.8 million cases in the US between April 2009 and April 2010. There were nearly 12,500 US deaths during that same time period. Here is a source for that information: https://www.livescience.com/covid-19-pandemic-vs-swine-flu.html So given those figures from the CDC the US case fatality rate for the H1N1 swine flu pandemic was approximately 12,500 deaths/60,800,000 infections = .0002 which is the same as .02%. The observed case fatality rate for covid-19 in the US currently stands at 2.15 % and that for the swine flu was .02%. 2.15/.02 = 107.5. So the observed case fatality rate for covid-19 in the US is currently about 100 times greater than that estimated by the CDC for the H1N1 pandemic. That is not opinion, it is simply what the numbers show. Now many are going to say but, but, but that observed case fatality rate for the US is not realistic because there are thousand or even millions of people who have actually already contracted the virus in the US and had minimal symptoms or no symptoms at all and have therefore not yet been tested. If there have been very many undocumented cases of covid-19 that did not result in death and will not result in death, then that observed case fatality rate would certainly eventually drop. That would be a cheery happening and I sincerely hope it comes to pass. But consider this. If that were the case, as covid-19 testing becomes more prevalent throughout the US we should be picking up those previously undocumented cases with mild symptoms and the case fatality rate should be expected to continuously drop. Testing has been becoming more widely available. But the US observed case fatality rate has been going up, not down. Last week it was running around 1.6% and now it is 2.15%, a 34% increase from last week. Consider also the experience from South Korea. They are about the only country that did extensive population-based testing, including screening in urban areas, that was not limited to individuals with symptoms or those considered to be at higher risk due to travel history or known contacts. So they should have picked up a whole bunch of those mild cases and have a much lower observed case fatality rate. Well, South Korea's observed case fatality rate is a bit lower than the current US rate. As of today it is 165 deaths/9887 confirmed cases = .0167 or 1.67%. That is about where the US was a few days ago. It is certainly no where near the 0.1% case fatality rate that many hope will be the eventual CFR for covid-19 in the US when all those thousands of trivial cases show up, that would show that it was no more lethal than plain old influenza. But even an eventual case fatality rate of .1% for covid-19 would still be 5 times what was observed for the swine flu.