Categories Articles Pfizer COVID-19 vaccine may be less effective in young children ages 5-11, new data shows Post author By crystalg Post date February 28, 2022 Business Insider Business Insider Tags Ages, Children, COVID19, Data, Effective, Less, Pfizer, shows, Vaccine, Young ← Markets Bid Up from Session Lows; ZM, HPQ Beat Earnings → More than 5 million children worldwide have lost a parent or caregiver from COVID-19