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This stretch of Spike is important because of its proximity to a region key for virulence," Vaughn Cooper, one of the study’s senior authors and director of the University of Pittsburgh’s Center for Evolutionary Biology and Medicine, told CNN. sean wotherspoon 2020 UNITED AND AMERICAN AIRLINES OFFERING COVID-19 VACCINE FOR CHICAGO O’HARE EMPLOYEESThe CDC issued a mandate in January saying that passengers on airplanes and public transportation must wear masks as part of efforts to curb the spread of COVID-19. sean wotherspoon 2020 Some people have voiced concern over the vaccine, which is 72% effective compared to the much higher efficacy of the Moderna and Pfizer vaccines, although the Johnson & Johnson vaccine only requires one shot, as opposed to two for the others. sean wotherspoon 2020 BUCKINGHAM PALACE RESPONDS TO MEGHAN MARKLE BULLYING ALLEGATIONS REPORT: 'WE ARE CEALY VERY CONCERNED'"I'm just really relieved and happy to be sitting here, talking to you with my wife by my side," the royal says in a clip released last weekend. sean wotherspoon 2020