[DennisP]

12.3% when they completed their antibody survey. Taking their death count a week later (because 2 weeks to develop antibodies, 3 weeks to die), and comparing to 12.3% of the NYS population, that equates to 1.1% fatality. An antibody survey in Spain got the same answer.

Herd immunity won't happen until about half the population has had the virus, and 1.1% of 330M is 1.8 million people dead. I'd call that fairly dangerous.

Also consider that many of the survivors end up with serious long-term health problems.