Diseases that were largely eradicated forty years ago are returning. Across the world children are dying from preventable conditions, because nervous parents are skipping their children's vaccinations. Yet the stories of vaccine injury are frightening, with rare cases of people being seriously hurt by vaccines. This documentary looks at the growing trend of vaccine hesitancy around the world, exploring the reasons for complacency and concerns, and highlighting the impact of delaying or refusing immunisation.

"To vaccinate, or not? What would you do to protect the ones you love?"