我同意这个研究没有计算接种和没有接种的人感染的总概率,所以研究结果不能回答疫苗是否有效这个问题,只能说对常规病毒的有效率相对高于对南非变种的有效率。所以报道里的结论 ”This suggests the vaccine is less effective against the South African variant, compared with the original coronavirus and a variant first identified in Britain that has come to comprise nearly all COVID-19 cases in Israel, the researchers said.“ 是对的,但是意义不大。