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MedlinePlus is an online health information resource from the National Library of Medicine. Find quality, trusted health information in English and Spanish.

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Find technical information for web developers, including MedlinePlus Web Service, XML files, RSS feeds, and MedlinePlus Connect for electronic health records.

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Find a list of organizations and agencies whose materials appear on MedlinePlus health topic pages.

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Some content on MedlinePlus is in the public domain and some is copyrighted. Learn the rules for linking to and using public domain and licensed content.

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MedlinePlus links to health information from U.S. federal government agencies and selected other websites. Become familiar with MedlinePlus selection criteria.

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Chickenpox is a contagious disease caused by the varicella-zoster virus. It causes an itchy rash with blisters. Learn about vaccines and treatment.

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Find easy to read health information on MedlinePlus. These materials are easier for people with limited health literacy to read, understand, and use.

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Could that itchy, tickly feeling on your head be head lice? Learn about these tiny insects, such as how to tell if you have them, and how to treat it.