COVID-19 vaccine effectiveness and evolving variants: understanding the immunological footprint
In an effort to contain the COVID-19 pandemic, multiple vaccines based on different platforms were rapidly developed and used worldwide. As of April 7, 2023, over 13·3 billion vaccine doses have been administered globally. Although vaccines prevented symptomatic infections with SARS-CoV-2, these vaccines did not offer sterile immunity. In The Lancet Respiratory Medicine, Nana Wu and colleagues1 present findings from a rapid living systematic evidence synthesis and meta-analysis on long-term effectiveness of COVID-19 vaccinations against infection, hospitalisation, and mortality up to 307 days...