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	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

To the Editor: Health care professionals have expressed concerns about the quality and veracity of information individuals receive from Internet-based sources.¹ One area of controversy is the use of Internet sites to communicate information on immunization.² YouTube is a video-sharing Internet Web site created in 2005 that provides free video streaming. It allows users to share multimedia clips that contain information related to the risks and benefits of immunization. To our knowledge, no studies have examined the content of these videos. We conducted a descriptive study to characterize the available information about immunization on YouTube.

Methods

On February 20, 2007, we searched YouTube (www.youtube.com) using the keywords vaccination and immunization. We included all unique videos with English-language content that contained any message about human immunization. We extracted information on the type of video, clip length, and scientific claims made by the video. We measured the users' interaction with . . . [Full Text of this Article]

Jennifer Keelan, PhD
Department of Public Health Sciences
University of Toronto
Toronto, Ontario

Vera Pavri-Garcia, PhD
Division of Natural Science
York University
Toronto, Ontario

George Tomlinson, PhD
Department of Public Health Sciences
University of Toronto
Toronto, Ontario

Kumanan Wilson, MSc, MD
kumanan.wilson@uhn.on.ca
Department of Medicine
University of Toronto

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