People will naturally worry that safety might have been compromised in the tearing hurry for a vaccine. In fact, the current researchers are standing on the shoulders of many who have gone before. The existing technologies are being adapted to Covid-19. Science does not start with a blank sheet of paper every time. The process of regulatory approval has, indeed, been speeded up, but that does not mean its hurdles have been lowered. The Medicines and Healthcare products Regulatory Agency is emphatic that this is not the case. All vaccines approved will be closely monitored, as is the usual practice, and then reviewed in a year’s time.