A U.S. soldier has tested positive for coronavirus, the Department of Defense confirmed Tuesday.

It’s the first time a member of the U.S. military has tested positive for COVID-19, the disease caused by the coronavirus.

The 23-year-old male is quarantined in his off-base home at Camp Carroll in South Korea. Health professionals are currently working to determine whether others may have been exposed.

(U.S. Forces in Korea) “is implementing all appropriate control measures to help control the spread of COVID-19 and remains at risk level “high” for USFK peninsula-wide as a prudent measure to protect the force,” the DOD said in a statement.

Some 1,150 cases of coronavirus have been reported in South Korea, the largest number outside of mainland China.

Military personnel in the region are asked to practice proper hygiene such as washing hands with soap and water, avoiding unnecessary contact with others and cleaning common-use areas.

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