其實都好難拗...
https://bmcinfectdis.biomedcentral.com/articles/10.1186/s12879-022-07418-y
Research
Open Access
Published: 07 May 2022
SARS-CoV-2 vaccine effectiveness against infection, symptomatic and severe COVID-19: a systematic review and meta-analysis
打完針過左120日, 開似會有負數感染保護力...
但都叫做有 70% RRR 防重症....
但我想知防重症 ARR 係幾多...