Pick one: a mass-vaccination centre in Leipzig, Germany, offers the COVID-19 vaccines made by Moderna (red dish), Pfizer–BioNTech (green) and AstraZeneca (yellow).Credit: Jens Schlueter/Getty COVID vaccine comparison shows how jabs stack up A head-to-head comparison shows that the COVID-19 vaccines made by Pfizer and Moderna outperform those from Johnson & […]