Chickenpox

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Protection that helps keep children, families, and communities healthy

Chickenpox (also known as varicella) is a highly contagious viral illness that spreads through the air or by close contact. It often causes an itchy rash with fluidfilled blisters and can lead to serious complications, including pneumonia, encephalitis (brain swelling), and skin infections. Complications are more likely in infants, adults, pregnant people, and those with weakened immune systems. 

At Marshfield Clinic, our Family Medicine, Pediatric, and Internal Medicine providers include chickenpox vaccination as part of routine preventive care. We take time to review immunization history, answer questions, and recommend vaccines based on age, health needs, and risk factors.


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View immunization history

You can view your immunization history by logging into My Marshfield Clinic.


Symptoms

Chickenpox symptoms often begin before the rash appears and may include:

  • Fever
  • Fatigue or feeling unwell
  • Itchy rash that turns into fluid-filled blisters
  • Loss of appetite

Complications

While chickenpox is often mild in children, it can become serious, especially for certain groups. Possible complications include:

  • Infected blisters
  • Bleeding disorders
  • Encephalitis (brain swelling)
  • Pneumonia

Who's at risk?

Chickenpox can affect anyone, but the risk of severe illness is higher for:

  • Infants and young children
  • Adults who never had chickenpox or the vaccine
  • People with weakened immune systems
  • Pregnant women

Vaccine recommendations

The chickenpox vaccine is the most effective way to prevent varicella and its complications.

  • Children: Two doses beginning at age 1 (varicella or MMRV vaccine)
  • Teens and adults: Catchup vaccination if they were not fully vaccinated earlier

Frequently asked questions

Can adults get chickenpox?

Yes. Adults who haven’t had chickenpox or the vaccine can get the infection, and symptoms are often more severe than in children.

Is the chickenpox vaccine safe?

Yes. The vaccine is well studied and closely monitored. Most side effects are mild, such as soreness at the injection site or a low-grade fever.

Can my child get vaccinated if they’re mildly sick?

Often, yes. Your provider can help decide if it’s best to vaccinate now or wait.

Trusted resources

CDC chickenpox info: https://www.cdc.gov/chickenpox/index.html

Vaccine Safety: https://www.cdc.gov/vaccine-safety/ 

WHO Varicella Guidelines: https://www.who.int/news-room/fact-sheets/detail/chickenpox
 

Reviewed by Marshfield Clinic Health System medical experts