One of the biggest reasons the rate may be too high is the method of attribution. For example, in Italy, post-mortem testing of people who were origially pres

One of the biggest reasons the rate may be too high is the method of attribution. For example, in Italy, post-mortem testing of people who were origially presumed dead of other illnesses accounted for a large portion of testing. When it turned out they had COVID-19 at the time of death, the cause was attributed to COVID-19 regardless of comorbidities: https://www.bloomberg.com/news/articles/2020-03-18/99-of-those-who-died-from-virus-had-other-illness-italy-says https://www.bloomberg.com/news/articles/2020-03-18/99-of-tho... In other words, many of those who died today would have died within the year. Many were already in and out of hospitals for serious diseases. So, not only is the IFR wildly unknown without serology tests. The CFR itself is also severely biased. Currently in the U.S. you cannot get tested unless you have severe, life-threatening illnesses. The fact that the U.S. has such a low CFR speaks very well of healthcare in the U.S.... considering the majority of those tested have severe symptoms.