A new generation of vaccines and boosters against SARS-CoV-2 may take a page from the anti-influenza playbook, with shots periodically tailored to target the most commonly circulating virus
‘Breakthrough’ infections can happen because of waning immunity or high viral doses. But our vaccines are still excellent at preventing severe disease and death
An unprecedented level of research has gone into understanding the novel coronavirus. Here’s what we still don’t know Raphael Alves/EPA The pandemic has reached a grim milestone: