COVID-19 has put the subject of infections and pathogens firmly on the centre stage. But it can be difficult to know where to go to find information that is easy to understand and that you can trust. This week Matt talks to Dr Tregoning, author of ‘Infectious: pathogens and how we fight them’, a book that gives a fascinating overview of our ongoing fight against pathogens, uncovering success stories in immunology and virology, and providing some hope in these uncertain times.