The World Health Organization urged caution for countries considering vaccination certifications, including the potential use of “vaccine passports.”

Dr. Michael Ryan: “We have to be exceptionally careful, because right now we’re dealing with a tremendously iniquitous situation in the world, where the likelihood of you being offered or getting a vaccine is very much to do with the country you live in, very much to do with the level of wealth, the level of influence that you or your government has on global markets.”