A nurse prepares a booster dose of the Oxford-AstraZeneca Covid-19 vaccine during a vaccination drive for people over 60, in Mexicali, Mexico, on January 3. Fast-tracked regulatory approval and the ability to run clinical trials concurrently helped ensure the vaccine was developed for use within a year. Photo: Reuters
A nurse prepares a booster dose of the Oxford-AstraZeneca Covid-19 vaccine during a vaccination drive for people over 60, in Mexicali, Mexico, on January 3. Fast-tracked regulatory approval and the ability to run clinical trials concurrently helped ensure the vaccine was developed for use within a year. Photo: Reuters