1/n So, the rate of seropositivity in NYC is 20-25%. Not far from what we had guessed. Open the city, and it will be 50%. But that means countenancing another several 1000 deaths.

2/n So..masks, social distancing and school closures must still be in place. New data suggests that subways and closed spaces are sites of infection.

3/n No simple way out of this one. Low tech solutions are probably better. Mask, hand hygeine, distance, isolate the vulnerable. But a 0.7% -1% IFR is what we are looking at.

And wait for drugs and a vaccine... until they come !!