Imagine 30 percent of hospital staff become immune to Covid-19 from constant exposure, this is from a finding in a few Russian hospitals where the ICU staff are getting infected, but antibody tests find a lot more people exposed than the actual number of confirmed cases when doctors and nurses get infected by care and support of patients with Covid-19, over 25% of all of Russia's confirmed cases are medical staffers, which is the same in the USA and other countries.
Another group of essential workers who work in grocery and retail stores (the minimal level of risk when you're near people you interact in public during a pandemic), a recent serological study in the USA finds an estimated 9,000 of these workers tested positive for antibodies from SARS-CoV-2, the virus that causes Covid-19, but only 1,100 confirmed cases nationwide and 65 deaths, and we need grocery and retail stores to remain open, but we do this safely.
International health officials put the percent of Covid-19 fatalities in two ways: IFR-Infection Fatality Rate (diagnosed and undiagnosed cases) which is 0.1-0.5% depending on country and the CFR-Case Fatality rate (based on a nation's confirmed cases) at 1-10%, again depending on country. Is the total global Covid-19 fatality rate at 1-2% or 6.5% going by actual confirmed number of cases vs. serological antibody exposure studies? Yes, it is deadlier than the flu (0.1-0.9% depending on strains), but 1-2% may be realistic instead of 6.5%.