The speedy rollout is thanks to a combination of foresight, hard work and lucky breaks
The speed at which effective Covid-19 vaccines have come through to authorisation has caused surprise. Compared with previous vaccines, the process has been very fast and so, naturally, people are asking how can it have happened without some kind of compromise on standards and care. Explaining it all as simply a result of the wonders of the latest scientific advances seems vague. So how has it actually come about? In reality, there are at least 10 reasons: some are about good planning, some good science and some just good luck.