Moderna COVID-19 vaccine may be better than Pfizer against Delta variant; breakthrough cases rise with time<blockquote>Moderna新冠疫苗可能比辉瑞更好对抗德尔塔变异毒株；突破性案例随着时间的推移而增加</blockquote>
According to two reports published in medRxiv, the mRNA vaccine developed by Pfizer and BioNTech SE