It's not available yet, but a CDC Advisory Committee to vote on Wednesday for final approval. Author: Vanessa Croix Updated: 5:21 PM CDT May 11, 2021 SAN ANTONIO — This week, the FDA expanded emergency use authorization of the Pfizer vaccine to include children ages 12 to 15. “Most importantly, it draws us this much closer to getting herd immunity for the entire population. When we say that 70 or 80 percent of the population needs to be vaccinated, that includes children,” said Dr. Robert Leverence, Chief Medical Officer for UT Health Physicians at UT Health San Antonio. Pfizer representatives said the vaccine is 100 percent effective in preventing illness among those in that age group.