What can be done to reduce misperceptions about COVID-19 vaccines? We present results from experiments conducted simultaneously on YouGov samples in 10 countries (N = 10 600), which reveal that factual corrections consistently reduce false beliefs about vaccines. With results from these 10 countries, we find that exposure to corrections increases belief accuracy by 0.16 on a 4-point scale, while exposure to misinformation decreases belief accuracy by 0.09 on the same scale. We are unable to find evidence that either misinformation or factual corrections affect intent to vaccinate or vaccine attitudes. Our findings on effect duration are less conclusive; when we recontacted participants two weeks later, we observed 39% of the initial accuracy increase, yet this result narrowly misses conventional thresholds of statistical significance (p = 0.06). Taken together, our results illustrate both the possibilities and limitations of factual corrections. Evidence from 10 highly diverse populations shows that exposure to factual information reduces belief in falsehoods about vaccines, but has minimal influence on subsequent behaviours and attitudes.
Keywords: COVID-19 vaccines; belief updating; misinformation; multi-country study.
© 2023 The Authors.