A World Health Organization (WHO) official says its “best estimates” show that the new coronavirus may have infected about one in 10 people worldwide. Michael Ryan is a doctor and the head of emergencies at the United Nations’ health agency. He was speaking on Monday at a special meeting of the agency’s executive board dealing with COVID-19. The group’s 34 member countries provide much of the money used to pay for WHO operations. Dr. Ryan told the meeting the infection rates vary from cities to rural areas, and between different groups. And he said the new estimate means “the vast majority of the world remains at risk.” “Our current best estimates tell us that about 10 percent of the global population may have been infected by this virus,” he said.