This paper is in the following e-collections/theme issues:

Infodemiology and Infoveillance  Medicine 2.0: Social Media, Open, Participatory, Collaborative Medicine 

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Works citing "The Complex Relationship of Realspace Events and Messages in Cyberspace: Case Study of Influenza and Pertussis Using Tweets"

Anna C Nagel, Ming-Hsiang Tsou, Brian H Spitzberg, Li An, J Mark Gawron, Dipak K Gupta, Jiue-An Yang, Su Han, K Michael Peddecord, Suzanne Lindsay, Mark H Sawyer
J Med Internet Res 2013 (Oct 24); 15(10):e237 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.2705):

(note that this is only a small subset of citations)

1. Spitzberg BH. Toward A Model of Meme Diffusion (M3D). Communication Theory 2014;24(3):311 [CrossRef]