evidence: About 7 million adolescents, ages 12 to 17, have been fully vaccinated so far, according to the latest data published Thursday by the US Centers for Disease Control and Prevention. Fully vaccinated means two weeks since the completion of a second dose of the Pfizer/BioNTech coronavirus vaccine. Based on recent trends, another 600,000 or so adolescents may be fully vaccinated in the next two weeks, around the time many of them may be heading back to school in August. If that happens, then the number of adolescents fully vaccinated by that time will represent only about 30% of the roughly 25 million 12- to 17-year-olds in the United States.