https://www.ndm.ox.ac.uk/covid-19/covid-19-infection-survey/results/new-studies
最近牛津大學研究團隊分析了英國2020年12月到2021年五月的疫情，並且比較每個人打的疫苗，並且比較各個疫苗對於變種病毒的防護能力。
(原文：The dynamics of immunity following second doses differed significantly between BNT162b2 and ChAdOx1, with greater initial effectiveness against new PCR-positives but faster declines in protection against high viral burden and symptomatic infection with BNT162b2.)
