The compelling story of vaccination.

We may fear terrorist attacks, but in truth humans have always had far more to fear from infections. In 1919, Spanish flu killed over 50 million people, more than died in both world wars combined. In 1950, an estimated 50 million people caught smallpox worldwide, of whom 10 million died. In 1980, before measles vaccine was widely used, an estimated 2.6 million children died of measles every year. Today we are hostage to a new pandemic disease -the seemingly unstoppable COVID-19.

Less than 100 years ago, losing a child to an infection like diphtheria or polio was a dreaded but almost inevitable sorrow faced by all parents, from the richest to the poorest. Today, these killer diseases are almost never seen in industrialised countries, thanks to the development of vaccines. Immunisation has given modern parents peace of mind their ancestors could not imagine.

The history of vaccination is rich with trial, error, sabotage and success. It encompasses the tragedy of lives lost, the drama of competition and discovery, the culpability of botched testing, and the triumph of effective, lifelong immunity. Yet with the eradication in the first world of some of humanity's deadliest foes, complacency in some quarters has set in. COVID-19 has us again racing for a vaccine. The story of past achievements and failures helps us keep the race - and the hope - in perspective.

This is a book for everyone who wants to understand our past - and cares about our future.