A D.C. public school was closed Monday after city officials determined that a staff member had close contact with a person who tested positive for coronavirus, the school system announced Sunday evening.

Another public charter school announced it would also close Monday after a staff member had contact with someone who attended the D.C. church where the top clergy member tested positive for the virus.

In all, at least three public schools — School Without Walls High School, DC International School and Mundo Verde Public Charter School — are closed in the nation’s capital Monday so crews can deep clean the campuses before students are expected to return Tuesday.

On Sunday evening, city officials announced the first school closure after learning that an employee at School Without Walls High School had close contact with someone who had tested positive for the virus. The employee tested negative for coronavirus and has displayed no symptoms.

The person who tested positive for the virus stayed in the District for one night after arriving in the United States from Nigeria, according to city officials.

They said the staff member was one of three people who stayed in the same residence as the person who tested positive.

D.C. Public Schools Chancellor Lewis D. Ferebee said the high school — which serves about 600 students from all wards of the city — would be closed Monday so crews could thoroughly clean the campus.

The school system expects the school to reopen Tuesday.

“She has, and continues to be, asymptomatic,” Ferebee wrote in a letter to students and families. “Therefore, there is no immediate risk to students and staff. However, out of the outmost of caution, we are closing the school for one day.”

DC International School, a charter school that serves middle and high school students, announced Monday morning it would close so it can undergo a thorough cleaning. An employee at the school had contact with someone who attended Christ Church Georgetown — the Episcopal church whose rector tested positive for the virus Saturday, according to Tomeika Bowden, spokeswoman for the D.C. Public Charter School Board.

The rector oversaw church services on March 1.

D.C. Mayor Muriel E. Bowser urged Monday for the hundreds of people who attended Christ Church Georgetown to self-quarantine for 14 days since their last visit to the church.

A third school Mundo Verde Public Charter School will be closed so it can receive a thorough cleaning. The charter network has two campuses and only closed its main campus in Northwest Washington.

School Without Walls at Francis-Stevens — an elementary and middle school that shares some administrative staff with School Without Walls high school but is in a separate facility — remained open Monday.

All other campuses in the traditional public school system opened on a normal schedule on Monday.

The District has 62 separate charter school networks and each network can make its own decisions about whether it will close.