LITTLE ROCK, Ark. (AP) — Civil rights groups filed a lawsuit Tuesday accusing Arkansas of not taking adequate steps to prevent the spread of coronavirus in its prisons after officials said 600 inmates at one facility tested positive.

The NAACP Legal Defense and Educational Fund and the American Civil Liberties Union of Arkansas filed the lawsuit in federal court on behalf of nearly a dozen inmates, including three at the Cummins Unit. Officials on Monday said about a third of the inmates at that facility have tested positive for the coronavirus.

Arkansas has reported at least 1,990 coronavirus cases in the state, with 42 deaths.

For most people, the coronavirus causes mild or moderate symptoms, such as fever and cough that clear up in two to three weeks. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia.