What if vaccines were designed to spread from one person to another — just like viruses themselves — rather than be injected into each individual to trigger an immune system response? If that were the case, it would mean perhaps only five per cent of the UK population — or three million people — would need to be ‘immunised’. The rest would then ‘catch’ the vaccine as it spread rapidly across the country in airborne droplets passed on via close contact with others, just as colds and flu already spread. … One of the most advanced projects, funded by the...