The Rev. Jesse Jackson and his wife, Jacqueline Jackson, were "responding positively" to treatment Sunday — one day after being hospitalized with COVID-19, their son said.

Details: Physicians at the Northwestern Memorial Hospital in Chicago were "carefully monitoring" the 79-year-old civil rights leader and Jacqueline Jackson "especially because of their ages," said Jonathan Jackson in a statement Sunday.

• The two-time presidential candidate and his 77-year-old wife were both vaccinated against the virus in January.
• Jonathan Jackson did not disclose the treatment that his parents were receiving.

The big picture: People who have not been vaccinated against the virus comprise the vast majority of coronavirus cases and hospitalizations in the U.S.

Editor's note: This article has been updated with more details on the Jacksons' conditions and further context on COVID-19 cases and hospitalizations in the U.S.