If this is accurate, it would = ~ 2.7M New York residents having had the virus (about 10x # of confirmed cases).

Given 15K deaths, that would be ~0.55% mortality rate. With caveat that deaths lag behind infections. https://twitter.com/nygovcuomo/status/1253352837255438338

Infection rate will obviously have been much lower in other parts of the country. Seems a lot of serology studies are settling on 2-4%.