Eager to know when parts of America are finally approaching herd immunity against COVID-19? Then pay close attention to what’s happening in New York, New Jersey, Massachusetts and Connecticut.
Triggered by reopenings and fueled by the rise of more contagious variants, COVID numbers suddenly shot up across all four states last month. But then, just as suddenly, cases began to plummet right at the start of April — and they’re still plummeting today, even as restrictions are being lifted.
Could this swift reversal — which occurred despite rising mobility and mixing — herald the local onset of something like herd immunity (that is, the point when the virus starts to run