Brady Collins
Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV). It is usually a mild illness, but it can lead to serious complications and even death in some cases. The chickenpox vaccine is a live attenuated vaccine, which means it contains a weakened form of the virus that stimulates the immune system to build antibodies. While the vaccine is very effective in preventing chickenpox, it is still possible to get infected after being vaccinated, although this is rare and symptoms are typically milder. This occurrence is known as breakthrough chickenpox, and it can happen if an individual is not fully vaccinated with two doses. So, do vaccinated kids shed the chickenpox virus? Let's find out.
| Characteristics | Values |
|---|---|
| Chickenpox vaccine type | Live attenuated (weakened form of the virus) |
| Chickenpox vaccine protection | Prevents severe illness in almost all vaccinated children |
| Chickenpox vaccine effectiveness | Not 100% guaranteed, but has prevented millions of infections annually since its introduction in 1995 |
| Chickenpox vaccine dosage | Two doses recommended, with the first dose given between 12-15 months and the second dose given between 4-6 years |
| Chickenpox vaccine side effects | Mild pain, redness, or swelling at the injection site; fever; very small risk of febrile seizures and allergic reaction |
| Chickenpox vaccine and shedding | Very low risk of vaccinated children spreading chickenpox to unvaccinated children |
| Chickenpox vaccine and wild-type infection | Immunized children have 95% protection against serious illness |
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What You'll Learn
Chickenpox vaccine effectiveness
Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV). The chickenpox vaccine is highly effective in preventing severe illness and even death. Before the routine administration of the chickenpox vaccine, there were about 4 million cases annually in the United States, resulting in approximately 100 preventable deaths and 10,000 hospitalizations.
The chickenpox vaccine is available in two forms: a single-antigen varicella vaccine (Varivax®) and a combination measles, mumps, rubella, and varicella (MMRV) vaccine (ProQuad®). Both vaccines contain live, attenuated varicella-zoster viruses derived from the Oka strain. 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 12-15 months old, and the second dose is given at 4-6 years old, with at least three months between the two doses.
The effectiveness of the varicella vaccine has been studied extensively. A case-control study conducted from 1997 to 2003 found 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%. Another study reported that the effectiveness of one dose ranged from 55% to 87%, while two doses resulted in effectiveness ranging between 84% and 98%. A clinical trial also showed that children who received two doses were protected even ten years after vaccination.
While the vaccine is highly effective, there is a small chance of still contracting chickenpox, known as breakthrough chickenpox. However, symptoms are typically mild, with fewer blisters, low or no fever, and sometimes only red spots. In rare cases, vaccinated children may experience a very mild illness lasting a few days after receiving the vaccine, but it is extremely unlikely to lead to any complications seen in wild-type chickenpox infections.
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Chickenpox vaccine safety
Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV). The illness causes an itchy rash and can sometimes lead to serious complications. Before the introduction of the chickenpox vaccine in 1995, about 4 million people, mostly children, would contract the illness annually. Of these, up to 13,500 would require hospitalisation, and up to 150 would die each year.
The chickenpox vaccine is a two-dose series of shots that protect children and adults from contracting chickenpox. The first dose is given when a child is 12 to 15 months old, and the second dose is administered when the child is 4 to 6 years old. The vaccine is safe and well-tolerated by most people, with side effects usually being mild and going away on their own. These side effects may include soreness, redness, and swelling at the injection site, and a mild fever. In rare cases, a vaccinated person may develop a mild case of chickenpox, known as a breakthrough infection, with symptoms such as a few red spots but no blisters or fever.
The introduction of the vaccine has drastically improved the situation regarding chickenpox infections. Between 1995 and 2019, hospitalisations dropped by 94%, and deaths by 97% among people aged 50 and younger. During this period, it is estimated that the vaccines prevented 91 million cases of chickenpox, 238,000 hospitalisations, and nearly 2,000 deaths.
The chickenpox vaccine is a live attenuated vaccine, meaning it contains a weakened form of the virus that stimulates an immune response. This type of vaccine carries a very small risk of infection, and it is possible for a vaccinated person to develop a mild case of chickenpox shortly after receiving the vaccine. However, the body of scientific evidence overwhelmingly supports the safety of the chickenpox vaccine.
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Chickenpox transmission
Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV). It is spread when tiny droplets of the virus enter the air through coughing or sneezing, or through physical contact with the rash. Chickenpox is considered a common childhood illness, but adults can also contract it.
The chickenpox vaccine is a live attenuated vaccine, meaning it contains a weakened form of the virus. The vaccine may be given at the same time as other vaccines, and two doses are recommended for children by doctors as the best way to protect against chickenpox. The first dose is usually given when children are between 12 and 15 months old, with a booster shot for further protection at 4 to 6 years of age.
While it is uncommon, it is possible to get chickenpox after being vaccinated. This is known as breakthrough chickenpox and occurs when an infection develops at least six weeks after vaccination. Symptoms of breakthrough chickenpox are usually milder and shorter-lived, with fewer lesions and a lower risk of serious complications. However, vaccinated individuals may still experience symptoms such as red spots, mild rashes, pain, redness, or swelling at the injection site, and fever.
The risk of transmitting chickenpox from a vaccinated individual to an unvaccinated individual is extremely low. In the rare event that a vaccinated person develops breakthrough chickenpox, their illness is generally much milder, and the risk of transmission is significantly reduced. According to medical literature, there have been only five reported cases of transmission from vaccinated to unvaccinated individuals over the course of 55 million doses of chickenpox vaccine injections.
Therefore, while it is theoretically possible for vaccinated children to transmit chickenpox to others through shedding, the risk is extremely low. Vaccination provides a high level of protection against the disease and significantly reduces the chances of transmission, even in rare cases of breakthrough infections.
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Chickenpox symptoms
Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV). It is typically characterised by a very itchy red rash all over the body, which turns into fluid-filled blisters and then scabs. The rash may first appear on the chest, back, and face, before spreading to the rest of the body, including the mouth, eyelids, and genital area.
Other symptoms of chickenpox may begin to appear 1 to 2 days before the rash, and the illness usually lasts about 4 to 7 days. Vaccinated people who get chickenpox typically experience milder symptoms, with fewer or no blisters, and mild or no fever. They are also sick for a shorter duration than unvaccinated individuals. However, in rare cases, vaccinated people may experience disease severity similar to unvaccinated individuals.
Chickenpox can be serious, even life-threatening, during pregnancy and in babies, adolescents, adults, and immunocompromised individuals. Complications from chickenpox can include bacterial infections of the skin and soft tissues, such as Group A streptococcal infections. In some cases, hospitalisation may be required. While rare, deaths from chickenpox still occur in unvaccinated children and adults.
To relieve the itchiness and discomfort associated with chickenpox, cool wet compresses or baths in lukewarm water every 3 to 4 hours can help during the first few days. Oatmeal bath products and calamine lotion (avoiding the face and eyes) can also alleviate itching. Pain-relieving creams may be applied to sores in the genital area under medical guidance.
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Chickenpox treatment
Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV). The best way to protect against chickenpox is to get the chickenpox vaccine. The vaccine may be given at the same time as other vaccines and is recommended for children as young as 12 months old. Two doses of the vaccine are recommended for children by doctors as the best way to protect against chickenpox. Most people who get the vaccine will be protected for life and will not get chickenpox. If a vaccinated person does get chickenpox, the symptoms are usually mild. Vaccinated people often experience fewer to no blisters and low or no fever, but red spots may occur.
If your child has chickenpox, there are several things you can do to help relieve their symptoms:
- Give them cool or lukewarm baths for 10 minutes as often as needed. Do not use soap, as it can cause dry skin and make the itch worse.
- Apply calamine lotion to the itchy spots or use an ice cube on them for 10 minutes.
- If the itching becomes severe, give a dose of Benadryl (for children 1 year and older).
- Trim your child's fingernails and remind them not to scratch the sores, as this can lead to infection.
- Give acetaminophen (such as Tylenol) for a fever higher than 102° F (39° C). Do not give aspirin or ibuprofen products, as these can increase the risk of complications.
For people who are more likely to develop dangerous illnesses, antiviral medication is recommended. This includes people with a weakened immune system due to disease or medication. Antiviral medication works best if given as early as possible, preferably within the first 24 hours after the rash starts.
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Frequently asked questions
Yes, it is possible to get chickenpox after being vaccinated. This is known as breakthrough chickenpox. However, symptoms are usually mild and short-lived.
Symptoms include red spots, a rash, and fewer blisters. There may also be a low or no fever. Symptoms are generally much milder than wild-type chickenpox.
Breakthrough chickenpox is rare, affecting about 1% of vaccinated children. Since the introduction of the vaccine in 1995, the incidence of chickenpox has decreased by 97%.
