One thing we're all hoping for is that the new coronavirus vaccines will give us 'herd immunity' - this would mean that so many people are immune to the virus that it would start to die away as it can't find new hosts to infect. But how does herd immunity work in practice, and are the vaccines we have likely to put us in this fortunate position? Eva Higginbotham spoke with Peter English, a consultant in communicable disease control, to find out... Like this podcast? Please help us by supporting the Naked Scientists