More data on the #COVID19 attack rate in New York. Doctors screened all expectant moms at one NY hospital and found 29/210 (13.8%) were asymptomatic and positive. Exposure in New York to covid could be very high given emerging data on scope of prevalence https://www.nejm.org/doi/full/10.1056/NEJMc2009316

This study suggests that in hot spots like New York City, the level of #COVID19 exposure (and rates of some immunity once serology studies are in place) could be high. Not the 50%-66% needed to confer herd immunity, but much more than 10% in hot spots like parts of New York City.

Summary of data from the analysis.