Updated with new cases from Sunday.
Missouri saw its largest one-day increase of COVID-19 cases for a second straight day as health officials reported 413 positive tests Sunday a day after 389 new cases were reported statewide.
The seven-day average of new cases is now at its highest point since the start of the pandemic at 289.
The previous high for a one-day total was 368 on May 4. The seven-day average of new cases reached 254 three days later.
The previous highest seven-day average was 256 cases on April 12.
There have been 956 deaths associated with the virus, an increase of eight over the last two days.
Missouri has seen 18,003 confirmed cases in all.
Butler County has reported 24 new cases in the last eight days, including two more Sunday, to reach 78 total.
Ripley County health officials reported three new cases over the same period to reach 14 total.
Carter (6 total cases), Reynolds (3) and Wayne (1) counties remained the same Saturday, as did Stoddard (122) and Dunklin (73).
The Associated Press reports that health officials are investigating a virus outbreak that has infected 21 at state prison in Bonne Terre.
A total of 2,986 inmates and staff at the Eastern Reception, Diagnostic and Correctional Center have been tested so far with results pending, the St. Francois County Health Department said.
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, including other adults or people with existing health problems, it can cause more severe illness, including pneumonia. The majority of people recover. Missouri has reported 948 deaths as of Friday.
Some people with the virus are asymptomatic and do not show any signs they are infected but they can still spread it.