Shouting at each other into the void: A linguistic network analysis of vaccine hesitance and support in online discourse regarding California law SB277

Kali DeDominicis, Alison M. Buttenheim, Amanda C. Howa, Paul L. Delamater, Daniel Salmon, Saad B. Omer, Nicola P. Klein

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


In 2015, California passed Senate Bill 277 and became the third state in the United States to ban all nonmedical exemptions from school immunization requirements, effectively prohibiting religious and personal belief exemptions. This attracted grassroots opposition and considerable debate among vaccine hesitant factions online. This mixed-methods study used quantitative linguistic analysis, semantic network analysis, and content analysis techniques to examine 2424 online documents drawn from newspapers, blogs, health websites, government information pages, web forums, personal websites, Facebook groups, among others. The study examined which words and phrases were used most frequently by vaccine skeptics, vaccine defenders, and more neutral media accounts to illuminate how groups with different attitudes towards vaccination discuss and disseminate information about vaccines and vaccine policy online. We proposed an innovative methodology for examining online discourse surrounding vaccine hesitance, as well as for studying the online dissemination of misinformation about vaccines. Our findings highlighted discrepancies in the narratives between what vaccine supporters believe causes vaccine skepticism and the issues that vaccine skeptics actually discuss within their own digital spaces. For example, in these exchanges, the importance of parental rights overshadowed that of children's rights; supporters of vaccines brought up autism in more distinct documents than skeptics do; distrust of government regulators and researchers seemed to unite vaccine skeptics and defenders; and politicians, doctors, and even celebrities often served as proxies in heated exchanges about factual evidence, believability, and the importance of expertise in public discourse.

Original languageEnglish (US)
Article number113216
JournalSocial Science and Medicine
StatePublished - Dec 2020


  • Anti-vaccination movement
  • California SB 277
  • Digital research
  • Internet discourse
  • Semantic network analysis
  • Vaccine hesitance
  • Vaccine policy
  • Vaccines

ASJC Scopus subject areas

  • Health(social science)
  • History and Philosophy of Science


Dive into the research topics of 'Shouting at each other into the void: A linguistic network analysis of vaccine hesitance and support in online discourse regarding California law SB277'. Together they form a unique fingerprint.

Cite this