# Johnson & Johnson

A health worker prepares an injection of the AstraZeneca/Oxford Covid-19 vaccine at the Mignot Hospital in Le Chesnay near Paris on February 7, 2021. Photo: Alain Jocard / AFP
A health worker prepares an injection of […]

Vaccine rollout raises real-world questions

As several Covid vaccines are rolled out across the world, questions such as whether different jabs can be used in the same patient are being asked as governments try to deliver them to millions