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We summarize representative and dependable English-language Web sites that focus on parasitic infections, selected on the basis of high-quality content and usability. Web sites were categorized according to users' interests, as follows: Web sites with information for clinicians (pathogenesis, pathophysiology, diagnosis, and treatment of parasitic infections); Web sites with information for epidemiologists; Web sites with information for educators; and Web sites with information for researchers. At least 60 Web sites were identified that contained comprehensive and high-quality information about helminths and protozoa. These Internet resources provide invaluable information for the infectious disease practitioner.