Two-thirds of anti-vaccination propaganda posted online is created by just 12 so-called influencers, research has found.

Different to those who describe themselves vaccine hesitant, anti-vaxxers tend to employ aggressive methods to persuade others not to get injections designed to help prevent disease.

The list was compiled by the Centre for Countering Digital Hate (CCDH) and found most of the figures, who claim to be political or medical leaders, are based in America.

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