Chickenpox is one of the classic childhood diseases. A child or adult with chickenpox may develop hundreds of itchy, fluid-filled blisters that burst and form crusts. Chickenpox is caused by a virus.
The virus that causes chickenpox is varicella-zoster, a member of the herpesvirus family. The same virus also causes herpes zoster (shingles) in adults.
Alternative NamesVaricella; Chicken pox
Causes, incidence, and risk factorsIn a typical scenario, a young child is covered in pox and out of school for a week. The first half of the week the child feels miserable from intense itching; the second half from boredom. Since the introduction of the chickenpox vaccine, classic chickenpox is much less common.
Chickenpox can be spread very easily to others. You may get chickenpox from touching the fluids from a checkenpox blister, or if someone with chickenpox coughs or sneezes near you. The vaccine usually prevents the chickenpox disease completely or makes the illness very mild. Even those with mild illness may be contagious.
When someone becomes infected, the pox usually appear 10 to 21 days later. People become contagious 1 to 2 days beforebreaking out with pox. They remain contagious while uncrusted blisters are present.
Most cases of chickenpox occur in children younger than 10. The disease is usually mild, although serious complications sometimes occur. Adults and older children usually get sicker than younger children do.
Children whose mothers have had chickenpox or have received the chickenpox vaccine are not very likely to catch it before they are 1 year old. If they do catch chickenpox, they often have mild cases. This is because antibodies from their mothers' blood help protect them. Children under 1 year old whose mothers have not had chickenpox or the vaccine can get severe chickenpox.
Severe chickenpox symptoms are more common in children whose immune system does not work well. This may be caused by an illness or medicines such as chemotherapy and steroids.
SymptomsMost children with chickenpox act sick, with symptoms such as a fever, headache, tummy ache, or loss of appetite for a day or two before breaking out in the classic pox rash. These symptoms last 2 to 4 days after breaking out.
The average child develops 250 to 500 small, itchy, fluid-filled blisters over red spots on the skin.
Most pox will not leave scars unless they become infected with bacteria from scratching.
Some children who have had the vaccine will still develop a mild case of chickenpox. They usually recover much more quickly and have only a few pox (less than 30). These cases are often harder to diagnose. However, these children can still spread chieckenpox to others.
Signs and testsChickenpox is usually diagnosed from the classic rash and the child's medical history. Blood tests, and tests of the pox blisters themselves, can confirm the diagnosis if there is any question.
TreatmentIn most cases, it is enough to keep children comfortable while their own bodies fight the illness. Oatmeal baths in lukewarm water provide a crusty, comforting coating on the skin. An oral antihistamine can help to ease the itching, as can topical lotions. Trim the fingernails short to reduce secondary infections and scarring.
Safe antiviral medicines have been developed. To work well, they usually must be started within the first 24 hours of the rash.
DO NOT GIVE ASPIRIN to someone who may have chickenpox. Use of aspirin has been associated with a serious condition called Reyes Syndrome. ibuprofen has been associated with more severe secondary infections. Acetaminophen may be used.
Until all chickenpox sores have crusted over or dried out, avoid playing with other children, going back to school, or returning to work.
Expectations (prognosis)The outcome is generally excellent in uncomplicated cases. Encephalitis, pneumonia, and other invasive bacterial infections are serious, but rare, complications of chickenpox.
Once you have had chickenpox, the virus usually remains dormant or asleep in your body for your lifetime. About 1 in 10 adults will experience shingleswhen the virus re-emerges during a period of stress.
ComplicationsCall your health care provider if you think that your child has chickenpox or if your child is over 12 months of age and has not been vaccinated against chickenpox.
PreventionBecause chickenpox is airborne and very contagious before the rash even appears, it is difficult to avoid. It is possible to catch chickenpox from someone on a different aisle in the supermarket, who does not even know they have chickenpox!
A chickenpox vaccine is part of the routine immunization schedule.
Almost no one will develop moderate or severe chickenpox if they have received the chickenpox vaccine. The small number of children who do develop chickenpox after they have received the vaccine have only a mild case.
The chickenpox vaccine does not require a booster later in life. However, a similar but different vaccine given later in life may reduce the incidence of herpes zoster (shingles).
Talk to your doctor if you think your child might be at high risk for complications and might have been exposed. Immediate preventive measures may be important. Giving the vaccine early after exposure may still reduce the severity of the disease.
ReferencesMyers MG, Seward JF, LaRussa PS. Varicella-zoster virus. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 250.
American Academy of Pediatrics Committee on Infectious Diseases. Recommended immunization schedules for children and adolescents--United States, 2008. Pediatrics.2008;121:219-220.
This article uses information by permission from Alan Greene, M.D., © Greene Ink, Inc.
Chickenpox is a viral infection in which a person develops extremely itchy blisters all over the body. It used to be one of the classic childhood diseases. However, it has become much less common since the introduction of the chickenpox vaccine.
Alternative NamesVaricella; Chicken pox
Causes, incidence, and risk factorsChickenpox is caused by the varicella-zoster virus, a member of the herpesvirus family. The same virus also causes herpes zoster (shingles) in adults.
Chickenpox can be spread very easily to others. You may get chickenpox from touching the fluids from a chickenpox blister, or if someone with the disease coughs or sneezes near you. Even those with mild illness may be contagious.
A person with chickenpox become contagious 1 to 2 days before their blisters appear. They remain contagious until all the blisters have crusted over.
Most cases of chickenpox occur in children younger than 10. The disease is usually mild, although serious complications sometimes occur. Adults and older children usually get sicker than younger children.
Children whose mothers have had chickenpox or have received the chickenpox vaccine are not very likely to catch it before they are 1 year old. If they do catch chickenpox, they often have mild cases. This is because antibodies from their mothers' blood help protect them. Children under 1 year old whose mothers have not had chickenpox or the vaccine can get severe chickenpox.
Severe chickenpox symptoms are more common in children whose immune system does not work well because of an illness or medicines such as chemotherapy and steroids.
SymptomsMost children with chickenpox have the following symptoms before the rash appears:
The chickenpox rash occurs about 10 to 21 days after coming into contact with someone who had the disease. The average child develops 250 to 500 small, itchy, fluid-filled blisters over red spots on the skin.
Most pox will not leave scars unless they become infected with bacteria from scratching.
Some children who have had the vaccine will still develop a mild case of chickenpox. They usually recover much more quickly and have only a few pox (less than 30). These cases are often harder to diagnose. However, these children can still spread chieckenpox to others.
Signs and testsYour health care provider can usually diagnose chicken pox by looking at the rash and asking questions about the person's medical history. Small blisters on the scalp usually confirms the diagnosis.
Laboratory tests can help confirm the diagnosis, if needed.
TreatmentTreatment involves keeping the person as comfortable as possible. Here are things to try:
Medications that fight the chickenpox virus are available but not given to everyone. To work well, the medicine usually must be started within the first 24 hours of the rash.
DO NOT GIVE ASPIRIN OR IBUPROFEN to someone who may have chickenpox. Use of aspirin has been associated with a serious condition called Reyes syndrome. Ibuprofen has been associated with more severe secondary infections. Acetaminophen (Tylenol) may be used.
A child with chickenpox should not return to school or play with other children until all chickenpox sores have crusted over or dried out. Adults should follow this same rule when considering when to return to work or be around others.
Expectations (prognosis)Usually, a person recovers without complications.
Once you have had chickenpox, the virus usually remains dormant or asleep in your body for your lifetime. About 1 in 10 adults will have shingles when the virus re-emerges during a period of stress.
ComplicationsRarely, serious bacteria infections such as encephalitis have occured. Other complications may include:
Cerebellar ataxia may appear during the recovery phase or later. This involves a very unsteady walk.
Women who get chickenpox during pregnancy can pass the infection to the developing baby. Newborns are at risk for severe infection.
Calling your health care providerCall your health care provider if you think that your child has chickenpox or if your child is over 12 months of age and has not been vaccinated against chickenpox.
PreventionBecause chickenpox is airborne and very contagious before the rash even appears, it is difficult to avoid.
A vaccine to prevent chickenpox is part of a child's routine immunization schedule. For information, see: Chickenpox vaccine
The vaccine usually prevents the chickenpox disease completely or makes the illness very mild.
Talk to your doctor if you think your child might be at high risk for complications and might have been exposed. Immediate preventive measures may be important. Giving the vaccine early after exposure may still reduce the severity of the disease.
ReferencesMyers MG, Seward JF, LaRussa PS. Varicella-zoster virus. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 250.
American Academy of Pediatrics Committee on Infectious Diseases. Recommended immunization schedules for children and adolescents--United States, 2008. Pediatrics.2008;121:219-220.
This article uses information by permission from Alan Greene, M.D., © Greene Ink, Inc.
Reviewed ByReview Date: 08/02/2011
Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
There is no chickenpox RNA; chickenpox is a DNA virus.
A person with a history of chickenpox or history of chickenpox vaccine will typically have a positive antibody test for chickenpox.
Chickenpox vaccine is useful. It reduces the risk of chickenpox, of complications, hospitalizations, and deaths from chickenpox, and of shingles.
Chickenpox is not an autoimmune disease. Chickenpox is a viral communicable disease.
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Yes, you can give chickenpox vaccine in the same area as other vaccines.
Yes, anybody can get chickenpox.
Chickenpox is an illness. It has no advantages.
Chickenpox rates have decreased 90% since the use of chickenpox vaccine.
Pandas don't get chickenpox. Chickenpox affects humans and a few other primates.
There is no "chickenpox procedure." There is a diagnosis code for chickenpox, but no CPT code. There are CPT codes for chickenpox titer, culture, and immunization.
If you had chickenpox as a child, there is no special care required if you are pregnant and were exposed to chickenpox.