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Chickenpox (Varicella)

Chickenpox is a very contagious disease that causes a red, itchy rash with blisters. The rash can spread over the entire body. Chickenpox can be spread by touch or by inhaling the virus after an infected person coughs, breathes, or talks. Although usually mild to moderate, the disease can be serious and even life-threatening. The chickenpox vaccines have greatly reduced the number of people who get it and the serious consequences of chickenpox.source: 1

The best way to protect your child against chickenpox is to get them vaccinated. Because most kids get chickenpox vaccines, the number of cases, hospitalizations, and deaths from chickenpox has dropped by over 90% since the vaccines were introduced.source: 1 There are two vaccines that protect people from chickenpox:source: 2 (1) the chickenpox vaccine protects kids and adults from chickenpox alone, and (2) the MMRV vaccine protects kids 12 months through 12 years old from measles, mumps, rubella, and chickenpox (varicella).source: 3

Why does my child need to be vaccinated against chickenpox?

Chickenpox spreads easily from person to person. Although symptoms are normally mild, it can sometimes cause serious conditions like pneumonia (a lung infection), encephalitis (swelling of the brain), and even death.source: 2,source: 4 Babies and children with weakened immune systems are also at a higher risk for severe disease.source: 4 Vaccinating your child against chickenpox helps protect them. Pregnant women are also at high risk for complications if they get chickenpox.source: 4

The chickenpox virus can cause shingles later in life. Shingles is a painful skin rash that can affect the nervous system in severe cases. Kids who get the chickenpox vaccine may have a lower risk of developing shingles later in life.source: 5

How safe are the vaccines?

The chickenpox vaccines are safe and have been in use since 1995.source: 6 Severe allergic reactions are rare, occurring in less than 1 dose out of every million.source: 7 Learn more about vaccine safety.

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VPD Chickenpox-baby and doctor

How effective are the vaccines?

After two doses, the vaccines are more than 90% effective against the chickenpox virus.source: 8 Although it is not common, some children can still get chickenpox even after they’re vaccinated. But if this happens, then they will usually have milder symptoms with fewer or no blisters, a mild fever or no fever, and they won’t be sick for as long as people who don’t get vaccinated for chickenpox.source: 4

The vaccines prevent more than 4 million cases of chickenpox every year. That’s about the same as the number of kids born every year in the United States.source: 9,source: 10 Before the vaccines, more than 10,000 people went to the hospital each year for chickenpox.source: 9 Since then, the number has dropped to fewer than 1,400 hospitalizations each year, and chickenpox now causes 90% fewer deaths.source: 9

What are the vaccines’ side effects?

Most parents report their children had no side effects. Your child might experience mild side effects like a sore arm, a fever, or a rash. Serious reactions are rare.source: 7

Understanding the risks

Getting Chickenpox vs. Getting Vaccinated

Chickenpox

Vaccines to Prevent Chickenpox

Common: Mild to Moderate Symptoms or Side Effects

Symptoms can last about a week:

  • Itchy, blistering rash
  • Fever
  • Tiredness
  • Loss of appetite
  • Headache

If side effects occur, they are usually mild and last 1–3 days:

  • Soreness, swelling, and redness where the vaccine was given
  • Fever
  • Mild rash

More Serious Symptoms, Complications, or Side Effects

Serious effects from chickenpox can include:

  • Bacterial infections
  • Pneumonia
  • Central nervous system complications
  • Reye syndrome (swelling of the liver and brain)
  • Encephalitis (swelling of the brain)
  • Bleeding problems
  • Sepsis (life threatening extreme reaction to an infection)
  • Diarrhea
  • Fatigue
  • Rash
  • Swollen glands (uncommon, affecting 1 in 100 people)

When does my child need the vaccines?

Your child will need to get a chickenpox vaccine as part of their routine vaccine schedule once they are 12 months and older. Kids can get the chickenpox or MMRV vaccines at the same time as other vaccines. Children need two doses of the vaccine to receive the most protection.

Children over 4 years old who are not caught up on the chickenpox vaccine can get their second dose 3 months after the first dose. If your child missed their chickenpox vaccines, then talk with your child’s doctor about getting your child caught up.source: 11

First Dose

Between 12 and 15 months

Second Dose

Between 4 and 6 years