<span style="color: #222222;">The US Secretary of State Antony Blinken tested positive on Wednesday for Covid-19 and will shift to a virtual work schedule, the State Department said.<br />''<br />''The Secretary is fully vaccinated and boosted against the virus and is experiencing only mild symptoms, the department said in a statement.<br />''<br />''Blinken has not seen President Joe Biden in person for several days and Biden is not considered a close contact, it said.<br />''<br />''Spokesman Ned Price said that Blinken would no longer deliver a long-awaited speech on China policy scheduled for Thursday.<br />''<br />''Blinken was among guests who packed into a Washington hotel on Saturday evening for the annual White House Correspondents' Association dinner.</span>