A controversial US anti-vaccination campaigner has cancelled her Australian tour, saying she feels threatened by "pro vaccine extremists" and "anti-free-speech terrorists".

Sherri Tenpenny, an osteopath who has infuriated doctors by linking vaccines to a range of disorders including autism, was due to arrive in Australia to run a series of seminars next month.

Sherri Tenpenny has cancelled her Australian tour.

The author of "Saying No to Vaccines" had planned to tour Melbourne, Sydney, Brisbane, Adelaide and the Gold Coast, a hot spot for anti-vaccination parents.

But after a campaign by health professionals and scientists to prevent her spreading dangerous "lies", the Australian organiser of her tour, Stephanie Messenger, issued a statement on Thursday saying she had cancelled her trip because "pro vaccine extremists" had made "continual, anonymous threats of vandalism and violence".