645965 external_news 1617216126 1617216126 A week before Pfizer announced its vaccine was so far 100 percent effective in preventing Covid-19 in children ages 12 to 15, 11Alive News wondered why kids weren't included in the first round of vaccine clinical trials. M.G. Finn, Professor and Chair in the School of Chemistry and Biochemistry, and James A. Carlos Family Chair for Pediatric Technology, explained the differences in physiology between adults and children: "The numbers are different, the mechanics are different, the medical hazards and rewards are different," Finn says. 

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