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. 2023 Feb 24;25:e42227. doi: 10.2196/42227

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©Francesco Pierri, Matthew R DeVerna, Kai-Cheng Yang, David Axelrod, John Bryden, Filippo Menczer. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 24.02.2023.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on https://www.jmir.org/, as well as this copyright and license information must be included.

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Timelines of prevalence of vaccine information on Twitter. Trends were evaluated with the nonparametric Mann-Kendall test. Colored bands correspond to a 14-day rolling average with 95% CIs. (A) Daily number of vaccine tweets sharing links to news articles from low-credibility sources. There is a significant increasing trend (P<.001). (B) Daily number of vaccine tweets sharing links to news articles from mainstream sources. There is a significant decreasing trend (P<.001). (C) Ratio between the volumes of tweets sharing links to low-credibility and mainstream sources. There is a significant increasing trend (P<.001). (D) Daily percentage of tweets sharing links to inaccessible YouTube videos among all tweets sharing links to YouTube. There is a significant decreasing trend (P<.001).