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 to potential pandemic pathogens.
How the immune system fights infections
The immune system has two main branches: the innate system, which provides a rapid, general response, and the adaptive system, which learns to recognize specific pathogens. Vaccines train the adaptive immune system to remember invaders, but traditional vaccines target only one disease at a time.
Can the immune system be trained to fight more diseases?
New research suggests that by targeting conserved parts of viruses—regions that do not mutate quickly—scientists can design vaccines that trigger broad protection. For example, a universal coronavirus vaccine might target the spike protein’s stable regions, offering immunity against multiple variants and even new coronaviruses.
How scientists are trying to design broader spectrum vaccines
Several approaches are in development, including mosaic vaccines that display pieces of many different viruses, and nanoparticle vaccines that mimic multiple pathogens. Clinical trials are underway for a universal flu vaccine and a pan-coronavirus vaccine.
Could universal vaccines be used alongside specific ones in the future?
Experts believe that universal vaccines could complement existing shots, providing a first line of defense before a tailored vaccine is developed for a specific outbreak. This strategy could buy time during a pandemic and reduce the need for annual boosters.
“What if a universal coronavirus vaccine had existed at the start of the pandemic?” – The Economist
The podcast explores the potential of these next-generation vaccines to transform pandemic preparedness, making the world more resilient against emerging infectious diseases.