Chickenpox

(Varicella)

Definition

Chickenpox is a virus that spreads easily to others. It results in an itchy rash.

Chickenpox

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Causes

A virus called varicella-zoster virus (VZV) causes this illness. It spreads through:

  • Breathing airborne droplets that have the VZV virus
  • Direct contact with fluid from a chickenpox rash

A pregnant mother can also pass it to her fetus.

Risk Factors

The main risk factor is contact with someone who has chickenpox. It is most common in children under 10 years of age. It is also more common in winter and spring.

Other things that may raise the chance of chickenpox infection are:

  • No history of chickenpox infection in the past
  • No history of chickenpox (varicella) immunization
  • Health problems or medicines that lower the ability to fight infection, such as cancer, HIV infection, or an organ transplant
  • Maternal exposure during pregnancy

Symptoms

Symptoms start about 10 to 21 days after contact. They are worse in adults.

A person may begin by having:

  • Mild headache
  • Mild fever
  • Cough
  • Sore throat
  • Severe itch
  • Lack of hunger
  • Belly pain

The rash appears within 1 to 2 days after the first symptoms. The rash:

  • Starts with small, flat, red spots:
    • Spots become raised and form a round, very itchy, fluid-filled blister
    • Blisters happen in clusters, with new ones forming over 5 to 6 days
  • Starts in patches on the skin above the waist, such as the scalp
  • May also appear on the eyelids, in the mouth, upper airway, voice box, or on the genitals
  • Crusts over by day 6 or 7 and goes away within 3 weeks

Diagnosis

The doctor will ask about your symptoms and health history. A physical exam will be done. The rash is often enough to make the diagnosis.

Treatment

Chickenpox is mild in most people. It will pass on its own. In most, it will last for 1 to 3 weeks. Others may have serious problems from it.

The goal of treatment is to manage symptoms. Choices are:

  • Supportive care, such as wet compresses
  • Medicines to:
    • Ease itching, such as over the counter creams or lotions or oral antihistamine medicine
    • Shorten the infection and severity of the infection, such as antiviral medicine or varicella-zoster immune globulin

Prevention

To lower the risk of this problem:

RESOURCES:

Centers for Disease Control and Prevention
http://www.cdc.gov
Family Doctor—American Academy of Family Physicians
http://familydoctor.org

CANADIAN RESOURCES:

About Kids Health—The Hospital for Sick Children
http://www.aboutkidshealth.ca
College of Family Physicians of Canada
http://www.cfpc.ca

References:

Chickenpox. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/chickenpox. Accessed October 28, 2020.
Gershon AA, Breuer J, Cohen JI, et al. Varicella zoster virus infection. Nat Rev Dis Primers. 2015 Jul 2;1:15016.
Immunization schedules. Centers for Disease Control and Prevention website. Available at:
...(Click grey area to select URL)
Accessed October 28, 2020.
Varicella (chickenpox) vaccination. Centers for Disease Control and Prevention website. Available at:
...(Click grey area to select URL)
Accessed October 28, 2020.
Last reviewed September 2020 by EBSCO Medical Review Board James P. Cornell, MD
Last Updated: 10/28/2020

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