"If and when we have an effective vaccine, we must also use it effectively ... In other words, the first priority must be to vaccinate some people in all countries, rather than all people in some countries," he said.
In order to take care of those who are at higher risk, Adhanom added that priority should be given to healthcare workers, the elderly, and those with underlying conditions.
Several countries hope to have available vaccines as soon as possible. As of today, about 26 million people worldwide have been infected with the virus, and 878,963 people have died.