Chickenpox is an infection caused by the varicella-zoster virus. It causes an itchy rash with small, fluid-filled blisters. Chickenpox is highly contagious to people who haven’t had the disease or been vaccinated against it. Today, a vaccine is available that protects children against chickenpox. Routine vaccination is recommended by the U.S. Centers for Disease Control and Prevention (CDC).
Symptoms
The itchy blister rash caused by chickenpox infection appears 10 to 21 days after exposure to the virus and usually lasts about five to 10 days. Other signs and symptoms, which may appear one to two days before the rash, include:
- Fever
- Loss of appetite
- Headache
- Tiredness and a general feeling of being unwell (malaise)
Once the chickenpox rash appears, it goes through three phases:
- Raised pink or red bumps (papules), which break out over several days
- Small fluid-filled blisters (vesicles), which form in about one day and then break and leak
- Crusts and scabs, which cover the broken blisters and take several more days to heal
New bumps continue to appear for several days, so you may have all three stages of the rash — bumps, blisters and scabbed lesions — at the same time. You can spread the virus to other people for up to 48 hours before the rash appears, and the virus remains contagious until all broken blisters have crusted over.
The disease is generally mild in healthy children. In severe cases, the rash can cover the entire body, and lesions may form in the throat, eyes, and mucous membranes of the urethra, anus and vagina.
Treatment
In otherwise healthy children, chickenpox typically needs no medical treatment. Your doctor may prescribe an antihistamine to relieve itching. But for the most part, the disease is allowed to run its course.
If you’re at high risk of complications
For people who are at high risk of complications from chickenpox, doctors sometimes prescribe medications to shorten the length of the infection and to help reduce the risk of complications.
If you or your child are at high risk of complications, your doctor may suggest an antiviral drug such as acyclovir (Zovirax, Sitavig). This medication might lessen the severity of chickenpox when given within 24 hours after the rash first appears. Other antiviral drugs, such as valacyclovir (Valtrex) and famciclovir, also may lessen the severity of the disease, but might not be approved or appropriate for everyone.
In some instances, your doctor may recommend getting the chickenpox vaccine within three to five days after you’ve been exposed to the virus. This can prevent the disease or lessen its severity.
Treating complications
If complications develop, your doctor will determine the appropriate treatment. He or she may prescribe antibiotics for skin infections and pneumonia. Brain inflammation (encephalitis) is usually treated with antiviral drugs. You may need to be hospitalized.
