Centers for Disease Control (CDC) has developed a Controlled Health Thesaurus with an
ultimate aim of using the concepts on web content to provide better access and
navigation to the information. The CDC Web site at http://www.cdc.gov averages over 8
million visits each month and reaches citizens, public health providers, partners,
congressional staff, news agencies, researchers, and clinicians. In public health
emergencies, the site is a chief source of credible information as evidenced by the spike
of visits to 14 million during SARS. The Thesaurus is part of a larger framework to
facilitate the intuitive finding and accessing of information on the site.