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Spearman correlations with Centers for Disease Control and Prevention\u2013reported measles cases and differenced smoothed cumulative case counts over this period were reported (using time series bootstrap confidence intervals). A total of 58,078 Facebook posts and 82,993 tweets were identified from 4 January 2009 to 27 August 2016. Pro-vaccination posts were correlated with the US weekly reported cases (Facebook: Spearman correlation 0.22 (95% confidence interval: 0.09 to 0.34), Twitter: 0.21 (95% confidence interval: 0.06 to 0.34)). Vaccine-hesitant posts, however, were uncorrelated with measles cases in the United States (Facebook: 0.01 (95% confidence interval: \u22120.13 to 0.14), Twitter: 0.0011 (95% confidence interval: \u22120.12 to 0.12)). These findings may result from more consistent social media engagement by individuals expressing vaccine hesitancy, contrasted with media- or event-driven episodic interest on the part of individuals favoring current policy.<\/jats:p>","DOI":"10.1177\/1460458217740723","type":"journal-article","created":{"date-parts":[[2017,11,17]],"date-time":"2017-11-17T06:55:27Z","timestamp":1510901727000},"page":"1116-1132","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":72,"title":["Facebook and Twitter vaccine sentiment in response to measles outbreaks"],"prefix":"10.1177","volume":"25","author":[{"given":"Michael S","family":"Deiner","sequence":"first","affiliation":[{"name":"University of California, San Francisco, USA"},{"name":"University of California, San Francisco, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cherie","family":"Fathy","sequence":"additional","affiliation":[{"name":"Vanderbilt University, USA"},{"name":"University of California, San Francisco, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jessica","family":"Kim","sequence":"additional","affiliation":[{"name":"University of California, San Francisco, USA"},{"name":"University of California, San Francisco, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katherine","family":"Niemeyer","sequence":"additional","affiliation":[{"name":"Icahn School of Medicine at Mount Sinai, USA"},{"name":"University of California, San Francisco, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Ramirez","sequence":"additional","affiliation":[{"name":"University of California, San Francisco, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah F","family":"Ackley","sequence":"additional","affiliation":[{"name":"University of California, San Francisco, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fengchen","family":"Liu","sequence":"additional","affiliation":[{"name":"University of California, San Francisco, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas M","family":"Lietman","sequence":"additional","affiliation":[{"name":"University of California, San Francisco, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Travis C","family":"Porco","sequence":"additional","affiliation":[{"name":"University of California, San Francisco, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2017,11,17]]},"reference":[{"key":"bibr1-1460458217740723","doi-asserted-by":"publisher","DOI":"10.1001\/jama.1991.03470110093039"},{"key":"bibr2-1460458217740723","doi-asserted-by":"publisher","DOI":"10.3949\/ccjm.77a.09123"},{"key":"bibr3-1460458217740723","doi-asserted-by":"publisher","DOI":"10.1086\/377712"},{"key":"bibr4-1460458217740723","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(10)62352-5"},{"key":"bibr5-1460458217740723","volume-title":"Red Book 2015. 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