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Rat droppings from New York City. Poop from dog parks in Wisconsin. Human waste from a Missouri hospital. These are some of the materials that are readying us for the next chapter of the coronavirus saga. More than four years into the pandemic, the virus has loosened its hold on most people’s bodies and minds. But a new variant better able to dodge our immune defenses may yet appear, derailing a hard-won return to normalcy. Scientists around the country are watching for the first signs. Sign up

United statesUniversity of missouriNew yorkSarah cobeyAkiko iwasakiMarc johnsonKatia koelleEmily martinUniversity of michiganFred hutchinson cancer centerEmory university in atlantaYale universityCenters for diseaseUniversity of chicagoUniversity of washingtonYork times company