Madison Clarke
Chickenpox is a mild disease for many children, but it can have serious complications and even lead to death in rare cases. Before the introduction of the chickenpox vaccine in the US in 1995, there were around 4,000,000 cases per year, with 10,500-13,000 hospitalizations and 100-150 deaths, mostly among young children. The vaccine has been highly effective in preventing severe illness in almost all vaccinated children, and millions of infections are prevented each year. In this article, we will explore the topic of chickenpox vaccination in the US, including vaccine types, effectiveness, and recommendations for children.
| Characteristics | Values |
|---|---|
| Chickenpox vaccine availability in the US | Varivax® and ProQuad® are approved for use in the US |
| Varivax® protection | Protects only against chickenpox |
| Varivax® eligibility | Children 12 months and older and adults |
| ProQuad® protection | Protects against measles, mumps, rubella, and chickenpox |
| ProQuad® eligibility | Children 12 months through 12 years old |
| Number of doses | Two doses |
| Time between doses | Children 12 years and younger: at least three months; People 13 years and older: at least 28 days |
| Side effects | Soreness, redness, or swelling at the injection site; Mild rash at the injection site; Temporary joint pain and stiffness; Fever; Febrile seizures |
| Vaccine effectiveness | 70% to 90% effective for preventing chickenpox; More than 95% effective for preventing severe chickenpox |
| Vaccine impact | Reduced chickenpox cases, hospitalizations, and deaths |
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What You'll Learn
Chickenpox vaccines in the US
Chickenpox is a highly contagious illness that can be spread by direct contact, through the air by sneezing or coughing, or by coming into contact with fluid from chickenpox blisters. It usually causes an itchy rash that forms between 200 and 500 blisters all over the body, as well as headaches, coughing, and irritability. While chickenpox is often mild, it can be serious during pregnancy, in infants under 12 months old, adolescents, adults, and people with weakened immune systems. In rare cases, some people get so sick that they need to be hospitalized and may even die from chickenpox.
Chickenpox vaccines have been available in the US since 1995, and they have prevented millions of infections every year. The vaccines provide immunity from chickenpox without the risk of serious complications caused by the disease itself. There are two chickenpox vaccines approved for use in the US: Varivax® and ProQuad®. Varivax® is a single-dose vaccine that protects against chickenpox and is approved for children 12 months and older and adults. ProQuad® is an MMRV vaccine that protects against chickenpox, measles, mumps, and rubella. It is approved for children between 12 months and 12 years old. Both vaccines provide the same level of protection against chickenpox, but ProQuad® has a slightly higher risk of causing a fever or febrile seizure as side effects when given as the first dose to children under 48 months. Therefore, the US Centers for Disease Control and Prevention (CDC) recommends that children under 48 months old receive two separate shots of Varivax and the MMR vaccine at the same appointment.
The CDC recommends that all children receive the chickenpox vaccine at 12 months of age if they do not have evidence of immunity. Children under 13 years old should receive two doses of the vaccine, with at least three months between doses for children 12 years and younger, and at least 28 days apart for people 13 years and older. The second dose strengthens immunity and provides better protection if exposed to the chickenpox virus. While the chickenpox vaccine is very safe, mild side effects may include soreness, redness, or swelling at the injection site, and a mild rash. More severe side effects are rare but may include a severe rash.
Overall, the chickenpox vaccine is an important tool to protect children in the US from chickenpox and its potential complications. It is recommended that parents consult with their healthcare providers to determine the appropriate vaccination schedule for their children.
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Side effects and risks
Chickenpox is usually a mild disease, but it can be serious for infants under 12 months old, adolescents, adults, pregnant women, and people with weakened immune systems. In rare cases, some people get so sick that they need to be hospitalized, and chickenpox can even be fatal.
The chickenpox vaccine is part of the childhood immunization schedule in the US, and most kids receive two doses of the vaccine by age 6. The two vaccines approved for use in the US are Varivax® and ProQuad®. Both vaccines provide the same level of protection against chickenpox, but ProQuad also protects against measles, mumps, and rubella.
Like all vaccines, there is a possibility of side effects. However, side effects of the chickenpox vaccine are usually mild and may include:
- Soreness, redness, or swelling at the injection site
- Mild rash at the injection site
- Temporary joint pain and stiffness
Serious side effects are rare but may include:
- Severe rash
- Infections of the lungs or liver
- Meningitis
- Seizures, often associated with fever (febrile seizures)
- General severe infection with the virus strain from the vaccine
In addition to the above, there is a very remote chance of a severe allergic reaction, which could be life-threatening. Symptoms of a severe allergic reaction include hives, swelling of the face and throat, difficulty breathing, a fast heartbeat, dizziness, and weakness.
The chickenpox vaccine is a live virus vaccine, which means that the vaccinated person can pass the virus to others. Therefore, vaccinated individuals should avoid close contact with people at high risk for getting chickenpox for six weeks after receiving the vaccine. People who are most at risk include pregnant women, newborn babies, and immunocompromised individuals.
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Chickenpox in adults
Chickenpox is a mild disease for many children, but it can be serious in adolescents, adults, and pregnant women. Adults who catch chickenpox usually have a more severe illness and take longer to recover. Chickenpox symptoms in adults are similar to those in children, but they can become more severe. The disease progresses through symptoms that start one to three weeks after exposure to the virus. These include flu-like symptoms such as fever, fatigue, loss of appetite, body aches, and headaches. These symptoms typically start a day or two before a rash appears.
The rash starts with red spots on the face and chest, eventually spreading over the entire body. The red spots develop into itchy, fluid-filled blisters. The blisters weep, become sores, form crusts, and then heal. As some of the blisters form crusts, it is not unusual for more red spots to appear, for a total of 250 to 500 blisters. For adults, new chickenpox spots often stop appearing by the seventh day.
Chickenpox is very contagious for anyone who is not immune. If you have been vaccinated or have had chickenpox in the past, you are unlikely to catch it again. However, even if you had chickenpox as a child, it is still possible to contract it as an adult, especially if you live with unvaccinated children under 12. If you are unvaccinated and believe you have been exposed to chickenpox, you should see a doctor, even if you have no symptoms.
There is a two-dose chickenpox vaccine (Varivax) that is about 94% effective at preventing the disease for life. Adults who haven't had chickenpox will get two doses about one month apart. The vaccine is generally very safe, but like all vaccines and medications, there is a possibility of side effects. Side effects of the chickenpox vaccine are usually mild and include soreness, redness, or swelling at the injection site.
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Chickenpox vaccine development
Chickenpox is an illness caused by the Varicella Zoster virus. It was once a nearly universal childhood disease, but it is now much less common in the United States due to widespread vaccination. Chickenpox is usually mild, but it can be severe in infants under 12 months old, adolescents, adults, and people with weakened immune systems. In rare cases, it can be fatal.
The chickenpox vaccine is a two-dose series of shots that protect children and adults from chickenpox. The first dose is typically given around a child's first birthday, and the second dose is administered when the child is between the ages of four and six. The doses should be at least three months apart for children under 13 years old, and at least 28 days apart for people 13 years and older.
The development of the chickenpox vaccine began in the early 1970s when Michiaki Takahashi and his colleagues in Japan developed a live attenuated varicella vaccine, the Oka strain. In 1981, American vaccinologist Maurice Hilleman and his team developed a chickenpox vaccine in the United States based on the Oka strain. The vaccine first became commercially available in 1984, and it was first licensed for use in the US by Merck in 1995 under the brand name Varivax.
There are currently two chickenpox vaccines approved for use in the US: Varivax and ProQuad. Varivax is a single vaccine that protects against chickenpox and is approved for children 12 months and older and adults. ProQuad, also known as the MMRV vaccine, protects against chickenpox, measles, mumps, and rubella. It is approved for children between 12 months and 12 years old. Both vaccines provide the same level of protection against chickenpox, but ProQuad offers protection against three additional diseases. However, it has a slightly higher risk of causing a fever or febrile seizure as side effects when given as the first dose to children under 48 months. Therefore, the CDC recommends that children under 48 months old receive two separate shots (Varivax and the MMR vaccine) at the same appointment.
The chickenpox vaccine is highly effective, preventing almost all cases of severe illness. It is estimated to be between 70% to 90% effective for preventing chickenpox and more than 95% effective for preventing severe cases. Most people do not experience any side effects from the vaccine, and those who do typically only have mild symptoms such as soreness, redness, or swelling at the injection site. However, in rare cases, the vaccine can cause more serious side effects such as a severe rash. Additionally, there is a small risk of developing herpes zoster (shingles) following vaccination, but this risk is lower than the risk associated with a natural chickenpox infection.
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Chickenpox vaccine effectiveness
Chickenpox is usually a mild disease, but it can be serious for infants under 12 months old, adolescents, adults, and people with weakened immune systems. Some people get so sick that they need to be hospitalized, and chickenpox can even be fatal. Chickenpox can also lead to serious complications in adults.
The chickenpox vaccine is highly effective in preventing the disease. Two doses of the vaccine are recommended, with a pooled estimate of 92% effectiveness assessed five years after vaccination. A case-control study conducted from 1997 to 2003 showed that one dose of the vaccine was 97% effective in the first year after vaccination and 86% effective in the second year. From the second to eighth year after vaccination, the effectiveness remained stable at 81% to 86%. A clinical trial showed that the protection lasted at least 10 years after vaccination for children who received two doses. The vaccine also lowers a person's risk of developing shingles later in life compared to those who had a chickenpox infection.
In the United States, the chickenpox vaccine is part of the childhood immunization schedule. The CDC recommends two doses of the vaccine for children, adolescents, and adults who do not have evidence of immunity. The first dose is typically given at 12 months, and the second dose is given at 4 to 6 years old. Children 12 years and younger need at least three months between doses, while people 13 years and older need a gap of at least 28 days.
The chickenpox vaccine is generally very safe, but like all vaccines, there is a possibility of side effects. These side effects are usually mild and may include soreness, redness, or swelling at the injection site, a mild rash, and temporary joint pain and stiffness. Serious side effects are rare but may include a severe rash.
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Frequently asked questions
Yes, most children in the US are vaccinated against chickenpox. The vaccine was introduced in 1995 and has since prevented millions of infections every year.
The CDC recommends that children receive the chickenpox vaccine at 12 months of age. The second dose should be received when the child is between 4 and 6 years old.
Side effects of the chickenpox vaccine are usually mild and may include soreness, redness, or swelling at the injection site. A mild rash may also occur.
Rarely, more serious side effects can occur, including a severe rash. There is also a very small risk of febrile seizures, especially after the MMRV vaccine.
Chickenpox can be serious in infants under 12 months old, adolescents, adults, and people with weakened immune systems. The vaccine helps to prevent severe illness and hospitalization in these high-risk groups.
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