Jan.21 -- U.S. infectious-disease chief Anthony Fauci speaks to the WHO by video link, marking the first effort by the Biden administration to mend ties with an agency crucial to fighting the coronavirus pandemic. "I am honored to announce that the United States will remain a member of the World Health Organization," Fauci said. He also said the U.S. will join Covax, the 92-nation collaboration seeking to deploy Covid-19 vaccines around the world.