Updated Wednesday at 11:45 a.m. to include update on St. Charles County cases.

Coronavirus challenged decision-makers across the state Tuesday. Schools closed and reopened. Some patients were cleared and new ones were tested. State legislators rolled up the welcome mat at the state Capitol. By evening, Missouri still had just one confirmed case of the virus.

Going forward, all emergency responders in St. Louis County must wear full protective equipment on medical calls for respiratory ailments, the county health department said Tuesday.

The directive comes in response to federal recommendations for coronavirus prevention amid reports that 10 firefighters in Seattle were potentially exposed to the virus when responding to an outbreak at a nursing home.

Meanwhile, at least two schools in the St. Louis area announced they would halt face-to-face classes in an effort to stop the spread of coronavirus. Maryville University said it was moving its classes online for two weeks, and St. Louis University said it was suspending all in-person courses next week while faculty decide what to do next. Both universities are on spring break this week.

Also on Tuesday, the federal Centers for Disease Control and Prevention confirmed that the college student quarantined at home in Ladue was infected with coronavirus. But there was more promising news: Missouri health director Randall Williams said 11 other tests statewide had come back negative.

In St. Charles County, two residents were awaiting test results on Wednesday from the county health department and had been placed under quarantine in recent days, said Mary Enger, county director of communications. One of them had been to Germany and the other to the state of Washington. Two others who had been to Mexico tested negative on Tuesday. All four people exhibited symptoms of the virus after returning from recent trips to countries or U.S. states that have reported confirmed cases of the virus.