Visitors to Washington from 27 US states considered “high-risk” for coronavirus will have to self-quarantine for two weeks, AFP quoted the mayor as saying on Monday.

Mayor Muriel Bowser announced the self-quarantine order on Friday and released the list of states considered “high-risk” on Monday.

The 14-day self-quarantine applies to anyone who has visited a “high-risk” state within the prior 14 days for non-essential activities.

A high-risk state is one where the seven-day moving average of daily new COVID-19 cases is 10 or more per 100,000 persons, the mayor's office said.

There have been 11,780 coronavirus cases in Washington and 581 deaths.

The United States is the hardest-hit country in the world with 4.23 million cases of COVID-19 and nearly 147,000 deaths, according to Johns Hopkins University.