![www.theatlantic.com](/proxy.php?image=https%3A%2F%2Fcdn.theatlantic.com%2Fthumbor%2FHvx-LJDsH7vDrSWAeWbCTk_7-tY%3D%2F0x0%3A2496x1300%2F1200x625%2Fmedia%2Fimg%2Fmt%2F2021%2F09%2Fhospitalizations%2Foriginal.jpg&hash=348b42b81887f24c176b4704eede36d3&return_error=1)
Our Most Reliable Pandemic Number Is Losing Meaning
A new study suggests that almost half of those hospitalized with COVID-19 have mild or asymptomatic cases.
The study found that from March 2020 through early January 2021—before vaccination was widespread, and before the Delta variant had arrived—the proportion of patients with mild or asymptomatic disease was 36 percent. From mid-January through the end of June 2021, however, that number rose to 48 percent. In other words, the study suggests that roughly half of all the hospitalized patients showing up on COVID-data dashboards in 2021 may have been admitted for another reason entirely, or had only a mild presentation of disease.
For two separate studies published in May, doctors in California read through several hundred charts of pediatric patients, one by one, to figure out why, exactly, each COVID-positive child had been admitted to the hospital. Did they need treatment for COVID, or was there some other reason for admission, like cancer treatment or a psychiatric episode, and the COVID diagnosis was merely incidental? According to the researchers, 40 to 45 percent of the hospitalizations that they examined were for patients in the latter group.