World Pfizer Says Its Vaccine Is Highly Effective in 5- to 11-Year-Olds October 22, 2021October 22, 2021Aina J. KhanComments Off on Pfizer Says Its Vaccine Is Highly Effective in 5- to 11-Year-Olds The companies reported that a lower dose of the vaccine had a 90.7 percent efficacy rate in preventing symptomatic Covid-19 in a clinical trial.
