Gov. Henry McMaster’s office said Tuesday that he has tested positive for COVID-19. The news comes four days after first lady Peggy McMaster tested positive for the virus.

According to a press release sent just after 12 p.m., the governor learned of his test results late Monday and is experiencing “mild symptoms with a cough and slight fatigue,” while the first lady is asymptomatic. The governor’s office said the first lady tested positive during a routine test on Friday.

The couple is isolating at home as Christmas approaches and remain in good spirits, the press release stated. Governor’s residence employees have also been sent home to quarantine and get tested.

“Peggy and I urge everyone to be extra careful during the Christmas holiday season,” Gov. McMaster is quoted as saying. “This virus spreads very easily.”

State health officials believe “there is no way to pinpoint precisely when or how Gov. McMaster or the first lady contracted the virus,” the governor’s office said.

COVID-19 case counts continue to tick up, with more than 18,000 cases statewide in the past week alone. The 30-day percent-positive rate sits at 18.9%. This week, close-contact healthcare workers and residents of long-term care facilities have gotten the state’s first vaccine doses.