Vaccine maker Pfizer said Friday that trials of its vaccine in children ages 2 to 5 show it did not provide the expected immunity in kids this age and it is adding a third dose to the regimen.
원문출처 : https://www.cnn.com/2021/12/17/health/pfizer-vaccine-children/index.html
원문출처 : https://www.cnn.com/2021/12/17/health/pfizer-vaccine-children/index.html