@mskathleenquinn @greg_travis Not the clinical trials, since they didn't measure infection.
But the observational studies in the first few months showed vaxes stopping infection and nearly 100% effective against severe disease and that drove everything that followed.
@mskathleenquinn @greg_travis 不是临床试验，因为它们没有测量感染。
但最初几个月的观察性研究表明，vaxes 可以阻止感染并且对严重疾病几乎 100% 有效，这推动了随后的一切。