Ewen Callaway A nanoparticle vaccine from South Korean firm SK bioscience, approved in 2022. Nik Spencer/Nature. Adapted from A. C. Walls et al. Cell 183, 1367–1382 (2020). Vaccines against the coronavirus SARS-CoV-2 have been given to billions of people to protect them from COVID-19, and have saved more than 20 million lives. But viral variants...
