An anti-vaccination group's plans to have an exhibit at the Sunshine Coast Healthy Lifestyle Expo has sparked national outrage.

An organiser of next weekend's event, Annie Infinite, said the expo had received so much hate mail since allowing the Australian Vaccination-sceptics Network a paid booth at the event, organisers had called police.

Nearly 500 people have signed a petition for the expo to ban the AVN and its chief proponent, Meryl Dorey.

Messages to the Expo have included "you should just die for supporting her" and "we are going to take you all down, all you natural therapist c****."

Despite the barrage of complaints, Ms Infinite said she would not cancel Ms Dorey's stall without an official written request from an authority.

Read more at the Sunshine Coast Daily