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. 2011 May 4;6(5):e19467. doi: 10.1371/journal.pone.0019467

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Signorini et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The red line represents the number of H1N1-related tweets (i.e., containing keywords swine, flu, influenza, or h1n1) as a percentage of the observed daily tweets, while the green line shows the number of confirmed or probable H1N1 cases. Note that the volume of tweets pertaining to influenza steadily declined even though the number of cases continued to grow, reflecting a lessening of public concern about the severity of the pandemic.