Could a single vaccine protect against multiple diseases? Ainslie Johnstone, The Economist’s data and science correspondent, joins Alok Jha, host of The Babbage podcast, to examine the latest advances in broad-spectrum vaccines and explain how they work with the immune system. These so-called “universal” jabs aim to defend against a range of threats, from respiratory viruses and bacterial infections to even allergens, offering a promising new way to reduce the impact of future pandemics. 00:00 -