British Prime Minister Boris Johnson, who tested positive for COVID-19, was admitted to the hospital due to “persistent symptoms of coronavirus,” the BBC reported Sunday.

A government spokeswoman described the move as a “precautionary step” that was “on the advice of his doctor.”

Johnson, 55, has been isolating after being diagnosed with coronavirus 10 days ago.

He has been self-quarantining separately from his pregnant girlfriend, who said Saturday she was “on the mend” after suffering symptoms over the past week.