Zika virus concerns

Rio 2016: Olympics should move due to Zika virus concerns

To press on with the Games in Rio, the second most affected city in Brazil by the Zika crisis, would be "irresponsible" and "unethical," the letter argued.

"Our greater concern is for global health. The Brazilian strain of Zika virus harms health in ways that science has not observed before," said the letter, signed by experts in the United States, Britain, Australia, Canada, Norway, the Philippines, Japan, Brazil and South Africa, among others.