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Nearly 30 patients with long COVID symptoms, but who tested negative for COVID, took part in a new study at Northwestern Medicine's COVID-19 clinic.
Potentially millions of people across the U.S. showed so-called long-COVID symptoms in 2020 even though they initially tested negative for the virus back then, researchers find.
Despite common symptoms that former hospitalized and nonhospitalized long COVID patients share, the researchers found notable differences between the groups.