Podcast
How do you calculate herd immunity?
Listen to Plus editor Rachel Thomas explain herd immunity on the Guardian Weekly Science podcast.
What is herd immunity and what does it have to do with a number called R0?
We look at a crafty mathematical device which, among other things, has helped people understand what causes cholera.
How do mathematical models of COVID-19 work and should we believe them? We talk to an epidemiologist, who has been working flat out to inform the government, to find out more.