Vaccines save lives. Yet vaccine opponents and conspiracy theorists continue to make dangerous claims that put the public in danger. Worryingly, the most prominent of these voices are using their anti-establishment platform to perpetuate myths that have been previously debunked. Those children remaining unvaccinated by choice are now not only at risk themselves, but are risking the lives of others who, for genuine medical reasons, cannot be vaccinated. Why is society, which usually stops us from harming strangers, tolerating such antisocial behaviour? Microbiologist Clare Taylor (Edinburgh Napier University) will be on hand to inject some sense.