The Rev. Jesse L. Jackson and his wife, Jacqueline, were being treated at a Chicago hospital Saturday after being diagnosed with COVID-19, their representatives said in a statement.
The Rainbow Push Coalition, a civil rights organization founded by Jackson, did not say why Jackson, 79 and Jacqueline, 77, had to be hospitalized.
"Doctors are currently monitoring the condition of both," the organization said. "Anyone who has been around either of them for the last five or six days should follow the CDC guidelines."
The two were being treated at Northwestern Memorial Hospital.
Jackson received the Pfizer COVID-19 vaccine in January and used the occasion to encourage Black people to get vaccinated.
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Although the coronavirus vaccines can prevent transmission and hospitalization, the virulent Delta variant has been the source of a small proportion of "breakthrough" cases that can affect older and immunocompromised people.
Jackson announced in 2017 that he had Parkinson's disease.
Well-wishers Saturday included Bernice King, daughter of Jackson mentor Martin Luther King Jr., and U.S. Rep. Joaquin Castro (D-Texas).
King tweeted she was "praying" for the reverend and his wife, and Castro tweeted, similarly: "Sending strength and prayers to Rev. Jesse Jackson and his wife Jacqueline."
Jackson ran for president unsuccessfully in 1984 and 1988, and some historians credit the campaigns with setting the stage for the presidency of Barack Obama.
This article was originally published on NBCNews.com.