Understanding vaccination resistance

Vaccine search term selection bias and the valence of retrieved information

Jeanette B. Ruiz, Robert A Bell

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Dubious vaccination-related information on the Internet leads some parents to opt out of vaccinating their children. Objectives: To determine if negative, neutral and positive search terms retrieve vaccination information that differs in valence and confirms searchers' assumptions about vaccination. Methods: A content analysis of first-page Google search results was conducted using three negative, three neutral, and three positive search terms for the concepts "vaccine," "vaccination," and "MMR" 84 of the 90 websites retrieved met inclusion requirements. Two coders independently and reliably coded for the presence or absence of each of 15 myths about vaccination (e.g., "vaccines cause autism"), statements that countered these myths, and recommendations for or against vaccination. Data were analyzed using descriptive statistics. Results: Across all websites, at least one myth was perpetuated on 16.7% of websites and at least one myth was countered on 64.3% of websites. The mean number of myths perpetuated on websites retrieved with negative, neutral, and positive search terms, respectively, was 1.93, 0.53, and 0.40. The mean number of myths countered on websites retrieved with negative, neutral, and positive search terms, respectively, was 3.0, 3.27, and 2.87. Explicit recommendations regarding vaccination were offered on 22.6% of websites. A recommendation against vaccination was more often made on websites retrieved with negative search terms (37.5% of recommendations) than on websites retrieved with neutral (12.5%) or positive (0%) search terms. Conclusion: The concerned parent who seeks information about the risks of childhood immunizations will find more websites that perpetuate vaccine myths and recommend against vaccination than the parent who seeks information about the benefits of vaccination. This suggests that search term valence can lead to online information that supports concerned parents' misconceptions about vaccines.

Original languageEnglish (US)
Pages (from-to)5776-5780
Number of pages5
JournalVaccine
Volume32
Issue number44
DOIs
StatePublished - Oct 7 2014

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Selection Bias
Vaccination
Vaccines
vaccination
vaccines
Measles-Mumps-Rubella Vaccine
Autistic Disorder
childhood
Internet
Immunization
immunization
statistics
Parents

Keywords

  • Content analysis
  • Internet search terms
  • Vaccine resistance
  • Vaccine websites

ASJC Scopus subject areas

  • Immunology and Microbiology(all)
  • Infectious Diseases
  • Public Health, Environmental and Occupational Health
  • veterinary(all)
  • Molecular Medicine

Cite this

Understanding vaccination resistance : Vaccine search term selection bias and the valence of retrieved information. / Ruiz, Jeanette B.; Bell, Robert A.

In: Vaccine, Vol. 32, No. 44, 07.10.2014, p. 5776-5780.

Research output: Contribution to journalArticle

Ruiz, Jeanette B. ; Bell, Robert A. / Understanding vaccination resistance : Vaccine search term selection bias and the valence of retrieved information. In: Vaccine. 2014 ; Vol. 32, No. 44. pp. 5776-5780.
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abstract = "Dubious vaccination-related information on the Internet leads some parents to opt out of vaccinating their children. Objectives: To determine if negative, neutral and positive search terms retrieve vaccination information that differs in valence and confirms searchers' assumptions about vaccination. Methods: A content analysis of first-page Google search results was conducted using three negative, three neutral, and three positive search terms for the concepts {"}vaccine,{"} {"}vaccination,{"} and {"}MMR{"} 84 of the 90 websites retrieved met inclusion requirements. Two coders independently and reliably coded for the presence or absence of each of 15 myths about vaccination (e.g., {"}vaccines cause autism{"}), statements that countered these myths, and recommendations for or against vaccination. Data were analyzed using descriptive statistics. Results: Across all websites, at least one myth was perpetuated on 16.7{\%} of websites and at least one myth was countered on 64.3{\%} of websites. The mean number of myths perpetuated on websites retrieved with negative, neutral, and positive search terms, respectively, was 1.93, 0.53, and 0.40. The mean number of myths countered on websites retrieved with negative, neutral, and positive search terms, respectively, was 3.0, 3.27, and 2.87. Explicit recommendations regarding vaccination were offered on 22.6{\%} of websites. A recommendation against vaccination was more often made on websites retrieved with negative search terms (37.5{\%} of recommendations) than on websites retrieved with neutral (12.5{\%}) or positive (0{\%}) search terms. Conclusion: The concerned parent who seeks information about the risks of childhood immunizations will find more websites that perpetuate vaccine myths and recommend against vaccination than the parent who seeks information about the benefits of vaccination. This suggests that search term valence can lead to online information that supports concerned parents' misconceptions about vaccines.",
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