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Bulent Ertugrul, another virologist, said that until a vaccine is developed, "face masks have to become an extension of our daily clothing".

Business registration will be entirely processed online before the end of the year. Separate registration of corporate domiciles and business premises will be piloted and a company may register more than one business premises.

Bruce Dart told a news conference that he had recommended the event be postponed until it was safer to bring large groups together indoors. He also urged people over age 60 who wanted to attend to "please stay home. Seek other ways to participate virtually."

Boyer said he was grateful for wooden pallets and plastic tarps donated by local residents to evacuees to help keep their tents off the ground and dry when the rains come, though he said the showers would still make a mess.

Bruce Aylward, senior advisor to Tedros, defended the WHO's relationship with China in another news briefing on Wednesday. He said that its work with China was important to understand the outbreak, which began in Wuhan in December.