@Kyhala @sujayjaswa @BallouxFrancois There have been many studies that showed reduced infection and transmission. The effect differed (and differs) by time, variant, type of vaccine, and number of doses. These were all done after the original trials.
@Kyhala @sujayjaswa @BallouxFrancois 有许多研究表明感染和传播减少。效果因时间、变体、疫苗类型和剂量数而不同（并且不同）。这些都是在最初的试验之后完成的。