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Sources:

CDC. Chickenpox.
<http://children.webmd.com/chickenpox-directory>

CDC. Chickenpox Complications.
<http://www.cdc.gov/chickenpox/about/complications.html>

CDC. Chickenpox Transmission.
<http://www.cdc.gov/chickenpox/about/transmission.html>

CDC. Chickenpox (Varicella). Overview.
<http://www.cdc.gov/chickenpox/about/overview.html>

CDC. Chickenpox (Varicella). Overview.
<http://www.cdc.gov/chickenpox/about/overview.html>

National Vaccine Information Center. Varicella Zoster (Chickenpox).
<http://www.nvic.org/Vaccines-and-Diseases/Chickenpox.aspx>

CDC. Chickenpox vaccine. What everyone should know.
<https://www.cdc.gov/vaccines/vpd/varicella/public/index.html>

Vaccines.gov. Chickenpox.
<http://www.vaccines.gov/diseases/chickenpox/>

CDC. Chickenpox (Varicella). When is a person contagious?
<http://www.cdc.gov/chickenpox/about/transmission.html>

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