The WHO said only 2% to 3% of people tested have COVID-19 antibodies, suggesting that 'immunity passports' may not be an effective policy https://www.businessinsider.com/coronavirus-who-warns-2-3-percent-population-have-antibodies-2020-4 The WHO director-general on Monday said that data suggests no more than 2% to 3% of the population have the antibodies to show they were infected by the coronavirus. These antibodies are needed to have immunity to the coronavirus before a vaccine is developed. A second WHO expert said the figure is less than expected, and undermines plans to create "immunity passports" as a route back to normal life. The WHO has also warned there's no evidence the coronavirus antibodies offer long-term immunity and that not all people who recover have the antibodies. (More at above url)
it should be noted that the underlying data supporting the WHO assertions seem to only cover hot zones where sampling testing has been done. There are many places in the world that have little to no testing for COVID-19.
New york city will be higher. Somewhere between 10 and 20%, maybe even 30% They are testing at the moment in New York city. A more accurate figure will give an indication of how deadly CV is.
11000 dead at 1% kill rate would mean 1.1 million infected, thats more than 10% of the population. 11000 dead at 0.5% kill rate would mean would mean > 2 million infected, thats about 25% of NYC
Im not sure if anyone thinks its that high when you consider all infection cases, not just the known ones. But if it is 2%, then we are in trouble until we find a vaccine.
Let's look at the world's COVID-19 mortality rate today - 177,439 dead / 2,556,421 reported cases = 6.94%
We know those exact numbers for new york as well. But Anti body testing will tell us how many people with mild or no symptoms also got infected. For new york it could be anywhere from 5 to 50% of the population depending on what the real kill rate of CV is (the real kill rate, not just deaths among known cases)