Trump supporters are more likely to believe conspiracy theories and hold anti-vaccination views, a University of Queensland study on American internet usershas found.

UQ researcher Professor Matthew Hornsey said Mr Trump had sent dozens oftweets linking vaccinations with autism before he became President, despitethis link being a long-discredited myth.

“Trump supporters are considerably more vaccine-hesitant than other Americans,and are more likely to be concerned about side-effects,” Professor Hornseysaid.

The research team also asked 518 Americans to what extent they believed famousconspiracy theories, such as suggestions Diana, Princess of Wales, wasmurdered and the September 11 attacks were an inside job organised by the Bushadministration.

The team found Trump voters were more likely to believe these conspiracytheories than other Americans.

“There’s a certain conspiratorial worldview held by Trump voters that makesthem more likely to be anti-vaccination,” Professor Hornsey said.

“Conspiracy theorists do not trust the official word on vaccination.

“They think the government or the drug companies are lying, or both.

“Trump has spread several conspiracy theories in the past, including thatBarack Obama faked his birth certificate, that climate change is a hoaxinvented by the Chinese and Ted Cruz’s father helped assassinate JFK,” hesaid.

The research team conducted further studies to test if reading Mr Trump’s oldanti-vaxx tweets still had an impact on the public.

“Trump voters became more anti-vaxx after reading his old tweets but they hadno effect on anyone else,” Professor Hornsey said.

Trump has stopped making anti-vaxx statements since he became President andlast year encouraged parents to vaccinate their children in the face of ameasles outbreak.

“We’re hoping this is a permanent change of heart,” Professor Hornsey said.

“Every President since Roosevelt has swung behind the science on vaccination,and it’s promising that Trump appears to have turned a corner on this issuebecause his words can save lives.”

This research was a collaboration between UQ’s School of Psychology and theUniversity of Exeter.

The study is published in the Journal of Experimental Social Psychology(DOI: 10.1016/j.jesp.2019.103947).


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