Comment by aristophenes

Does this mean that it was much more contagious than thought, if it spreads so fast while so many already have some immunity? Also, if 1/4 of New York City has already had covid-19, then maybe there is only ~1/4 left who wouldn't have immunity. Which would imply that if all restrictions were lifted (in NYC) the "curve" of new infections would be much lower than the first one.