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What do popular YouTube TM videos say about vaccines?

BACKGROUND: The unregulated social network YouTube TM has become an increasingly popular source of information on health topics such as vaccine safety. With a reach of over one billion users per month, the potential for misinformation is significant.

METHODS: Using the keywords 'vaccine safety' and 'vaccines and children', 87 of the most widely viewed YouTubeTM videos were identified and analyzed for content, author status and view count.

RESULTS: The range of view counts was 25 532 to 6 229 835, with a median of 62 075 views per video. Most videos (n = 74, 85.1%) were devoted exclusively to the topic of vaccination. The three most common sources of these YouTubeTM videos were consumers (27.6%), TV-based or Internet-based news (26.4%) and individual health professionals (25.3%). Top topics covered were autism causality (47.1% of videos), undisclosed or poorly understood risks (42.5%), adverse reactions (40.2%) and thimerosol or mercury in vaccines (36.8%). The majority of videos (65.5%) discouraged the use of vaccines.

CONCLUSION: Health professionals should be aware of the widely disseminated vaccination information available on the Internet and should appreciate its possible effect on the public.

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