Intensive Care Unit nurse Subramanya Kirugulige prepares a bed for an arriving COVID-19 patient at Roseland Community Hospital in Chicago in December. A large study has found that people with severe initial cases of COVID-19 tend to be at greater risk of more health problems later on.

CHICAGO, ILLINOIS – DECEMBER 14: (EDITORIAL USE ONLY) Intensive Care Unit nurse Subramanya Kirugulige prepares a bed for an arriving COVID-19 patient at Roseland Community Hospital on December 14, 2020 in Chicago, Illinois. Roseland Community Hospital is situated in the Roseland neighborhood on the city’s far south side. The neighborhood’s population is 95 percent black. The COVID-19 death rate among black residents in Chicago is nearly double that of the city’s white residents. Today, the United States recorded its 300,000 COVID-19 death. (Photo by Scott Olson/Getty Images)