Her mother Toni could not watch as medical staff unhooked her daughter from the hopelessly inadequate life support system, but her husband Dave did, and crumpled with grief.

"Dave was screaming," says Toni.

"I told him to be quiet. I just wanted to soothe my child."

As Toni held her tiny baby, she couldn't comprehend the loss, or how they would survive the sorrow.

Little did they know then that Dana's death from whooping cough, and the media coverage that followed, came to represent a very inconvenient truth to the anti-vaccination lobby - and thus began an extraordinary campaign against this grieving family.

The McCafferys are today breaking their silence on the cyber bullying,the anonymous letters and the cruelty of some members of the anti-vaccination movement.

The couple has been accused of being on the payroll of drug companies; they have had their daughter's death questioned and mocked; they have even been told to "harden the f . . . up" by an opponent of vaccination.