When their four-week-old baby daughter Dana died from whooping cough Toni and David McCaffery sought love and healing to ease their grief.

Instead, they say they were subjected to a campaign of harassment and abuse at the hands of anti-vaccination campaigners, a group who were yesterday labelled a serious threat to the public's health and safety.

Dana McCaffery ... died from whooping cough aged four weeks.

The Health Care Complaints Commission issued a public warning against the Australian Vaccination Network after it refused to display a disclaimer on its website to inform readers its information should not be taken as medical advice.

Earlier this month the commission investigated the network, run out of Bangalow on the north coast by Meryl Dorey, and found its website presented incorrect and misleading information that was solely anti-vaccination and quoted selectively from research suggesting that vaccination may be dangerous.