Chickenpox (Varicella)

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The incubation period—the time from exposure to the chickenpox virus until you have symptoms—is usually 14 to 16 days but can be from 10 to 21 days. The first symptoms of chickenpox infection include:

  • A fever of 100.4°F (38°C) to 103°F (39.4°C).
  • Feeling sick, tired, and sluggish.
  • Little or no appetite.
  • Headache and sore throat.

The first symptoms are usually mild in children, but they can be severe in teens and adults. These symptoms may continue throughout the illness.

About 1 or 2 days after the first symptoms of chickenpox appear, an itchy rash Click here to see an illustration. develops. During a typical course of chickenpox:

  • Red or swollen spots or bumps appear and turn into blisters that are filled with clear or cloudy fluid and that look like pimples.
  • The blisters break open, often leaking fluid.
  • A dry crust forms over the broken blisters as they heal.

Chickenpox is most contagious from 2 to 3 days before the rash appears until all the blisters have crusted over.

Other conditions may cause a similar rash.

By: Healthwise StaffLast Revised: July 30, 2010
Medical Review: Susan C. Kim, MD - Pediatrics
Thomas Emmett Francoeur, MDCM, CSPQ, FRCPC - Pediatrics

© 1995-2011 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

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