남미의 어느 해변의 브랑코씨

주요내용 Johnson & Johnson said Wednesday that studies show a booster dose of its vaccine offered a ninefold increase in antibodies compared with the vaccine on its own. The studies, released by Johnson & Johnson, come as the U.S. gears up next month to offer a third dose for those who received the Pfizer and Moderna vaccines. The announcement came as CDC studies show vaccines are less effective aga..