Like any medical drug, vaccines are tested in large-scale randomised controlled trials.
The efficacy of vaccines is estimated from trials, using statistical techniques.
Because the vaccine may not stop transmission of the virus.
Yes the approved vaccines are safe. If you balance the risks, then taking the vaccine is much safer than taking your chances with COVID-19.
We are all longing to go into a lower tier, but this can come at a high price later on.
Our favourite communicator of risk talks about the statistics of COVID-19, the quality of government briefings, and how to counter misinformation.
New research shows that ventilation is crucial and that masks are effective.
The second part of this article looks at reducing students's contacts and face-to-face teaching.
What can maths tell us about how to make universities safe from COVID-19?
How can we all get back to work safely in the face of a lingering pandemic?