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Pfizer-BioNTech and Moderna Coronavirus vaccines are 94 percent effective at preventing symptomatic Covid-19 disease, according to a new study of 1,800 US healthcare workers.The research the Centers for Disease Control and Prevention…

The Pfizer BioNTech coronavirus vaccine is extremely effective in adolescents ages 12 to 15, perhaps even more effective than it is in adults, the companies reported on Wednesday. No symptomatic infections were found in children who…