Top US military leaders are under self-quarantine after a senior Coast Guard official tested positive for coronavirus.
The chairman of the Joint Chiefs of Staff, General Mark Milley, was among those affected, officials said.
Military leaders who were in contact with Admiral Charles W Ray, the vice commandant of the Coast Guard, have been tested, Pentagon spokesman Jonathan Hoffman said in a statement.
None have exhibited symptoms or have so far tested positive.
Mr Hoffman said the quarantining of leaders will not affect "the operational readiness or mission capability of the US armed forces".
"Senior military leaders are able to remain fully mission capable and perform their duties from an alternative work location," he said.
While Mr Hoffman’s statement did not identify those affected, multiple US officials told the Associated Press news agency that besides General Milley, they included the chiefs of the Army, Navy and Air Force, as well as the head of US Cyber Command.
It is not known how Admiral Ray contracted the virus but it is not believed to be related to the outbreak affecting President Donald Trump and others at the White House, the officials said.
The Coast Guard said in a statement that Admiral Ray felt mild symptoms over the weekend and was tested on Monday.
Up to 14 officials are believed to have been potentially exposed to the virus after meetings last week with Admiral Ray. The officials were informed about the positive test on Monday.
Mr Trump tested positive for the virus on Friday and was injected with an experimental antibody cocktail at the White House before being taken to a military hospital.
He returned to the White House from Walter Reed National Military Medical Center on Monday.
Cover image: General Mark Milley was among those affected, according to officials (Picture: US Department of Defense).