Push against anti-vaxxers

A huge new study of more than half a million children found no link between the measles, mumps and rubella vacination and autism. Despite this, the author of the discredited study Andrew Wakfields, continues to peddle and promote his film Vaxxed, which has made more than $1.2m at the box office. Vaccinologist Helen Petousis-Harris explains why the anti-vaxxer movemtn is so powerful.