Yes, adults can get chickenpox. It is less common than in children, but when it happens in adulthood the illness tends to be more severe. Adults are more likely to develop complications such as pneumonia, and they take longer to recover than children do.
Chickenpox is caused by the varicella-zoster virus. Once you have had it, the virus stays dormant in your body for life. It can reactivate decades later as shingles, not chickenpox. If you never had chickenpox and never got the vaccine, you remain susceptible as an adult.
How Common Is Chickenpox in Adults?
Most adults in the United States are already immune. Before the varicella vaccine was introduced in the U.S. in 1995, chickenpox was extremely common in childhood, so the vast majority of people born before that era caught it and carry lifelong immunity.
That picture has changed. Children vaccinated since the mid-1990s may never have been exposed to the virus. Some of them reach adulthood without immunity, either because they were never vaccinated or because the vaccine did not produce a strong response. Some research suggests that a small share of vaccinated people lose protection over time, though the vaccine remains highly effective at preventing serious illness.
Adults who grew up in the U.S. before 1995 are usually immune from prior infection. Adults who grew up in tropical countries, where chickenpox tends to occur later in life, are more likely to reach adulthood without having had it. If you are unsure of your status, a blood test can check for antibodies.
Why Is Chickenpox Worse for Adults?
The virus behaves the same way in an adult as in a child, but the body’s response differs. Adults tend to run higher fevers, develop more extensive rashes, and take longer to recover. The main concern is complications.
Varicella pneumonia is the most serious common complication in adults. It is uncommon in healthy children but occurs more often in adults, particularly smokers and pregnant women. Other complications include inflammation of the brain (encephalitis), bacterial skin infections from scratching, and dehydration from fever and poor fluid intake.
Adults with weakened immune systems face the highest risk. That includes people receiving chemotherapy, organ transplant recipients, and people taking certain immune-suppressing medications. For these groups, chickenpox can be life-threatening.
Pregnant women deserve specific mention. Chickenpox during pregnancy can cause serious illness in the mother and, in a small number of cases, can affect the fetus. The risk depends on when in pregnancy the infection occurs. Any pregnant woman exposed to chickenpox should contact her doctor promptly rather than wait for symptoms.
What Are the Symptoms of Chickenpox in Adults?
The illness usually starts with symptoms that feel like a bad cold or flu. Fever, fatigue, headache, and loss of appetite are typical. These can last a day or two before the rash appears.
The rash is the defining feature. It begins as small red bumps that turn into fluid-filled blisters, then crust over. New crops of blisters appear over several days, so you may see bumps, blisters, and scabs at the same time. In adults the rash tends to be more widespread and the blisters more numerous than in children.
Most people feel unwell for roughly a week to ten days. Adults often report feeling exhausted for longer. The contagious period begins about one to two days before the rash appears and lasts until all the blisters have crusted over, which typically takes about five to seven days after the rash starts.
One detail people often miss: you are contagious before you know you are sick. The virus spreads through the air from coughing and sneezing, and through direct contact with blister fluid. That early contagious window is why chickenpox moves so easily through households and schools.
How Is Chickenpox Treated in Adults?
Most healthy adults recover with supportive care. That means rest, fluids, and fever control. Acetaminophen is generally preferred over ibuprofen for fever in chickenpox, because of longstanding concerns that ibuprofen and similar anti-inflammatory drugs may be linked to more severe skin infections in chickenpox. This is a widely held clinical caution rather than a firmly proven causal link, but many clinicians follow it.
Never give aspirin to anyone with chickenpox, child or adult. Aspirin during a viral illness in children and teenagers is linked to Reye’s syndrome, a rare but serious condition affecting the liver and brain. The same caution is generally applied to adults with chickenpox.
Antiviral medication is sometimes used. Acyclovir and related drugs can reduce the severity and duration of chickenpox if started early, ideally within the first day of the rash appearing. Antivirals are more often recommended for adults than children because adults are at higher risk of complications. Whether you need one is a decision for a doctor, based on your age, health, and how sick you are.
Antibiotics do not treat chickenpox, because it is a viral infection. Antibiotics are only relevant if a secondary bacterial skin infection develops.
Can You Prevent Chickenpox as an Adult?
Vaccination is the main way to prevent chickenpox. The varicella vaccine is recommended for children, and it is also available to adults who have never had chickenpox and were never vaccinated. Two doses are typically given, spaced several weeks apart.
The vaccine is not recommended during pregnancy. It is also generally avoided in people with significantly weakened immune systems, though a doctor can advise on individual situations. If you are unsure whether you are immune, getting tested before vaccination is reasonable.
If you are exposed and are not immune, a doctor may discuss options. For some high-risk groups, such as pregnant women or people with weakened immunity, a doctor may consider varicella-zoster immune globulin, which provides temporary antibodies. This is a decision for a clinician and depends on timing and individual risk.
If you do get sick, stay home until all blisters have crusted over. Avoid contact with pregnant women, newborns, and anyone with a weakened immune system. These groups are at the highest risk of severe illness.
Can You Get Chickenpox Twice?
It is rare. Once you have had chickenpox, you generally have lifelong immunity to getting it again. Reinfections do occur in a small number of people, and they are usually milder.
The virus itself never leaves your body. After the initial infection it hides in nerve cells and can reactivate later in life as shingles. Shingles is not the same as chickenpox. It usually appears as a painful rash in a band on one side of the body. Someone with shingles can pass the virus to a person who has never had chickenpox, and that person would develop chickenpox, not shingles.
This is one of the more misunderstood points about the virus. Having had chickenpox protects you from chickenpox again, but it does not protect you from shingles. Shingles can happen to anyone who has had chickenpox, most often after age 50, when immunity to the virus weakens. A separate shingles vaccine is available for older adults and is worth discussing with a doctor.
Frequently Asked Questions
Can you get chickenpox as an adult if you had it as a child?
It is very unlikely. Having chickenpox once usually gives lifelong immunity against getting it again. A small number of people do get reinfected, but it is rare and usually milder.
How serious is chickenpox in adults?
Adults tend to get sicker than children, with more fever, more blisters, and a higher risk of complications like pneumonia. Most healthy adults still recover fully, but the illness is harder on the body.
How long are you contagious with chickenpox?
You are contagious from about one to two days before the rash appears until all blisters have crusted over. That usually works out to about five to seven days after the rash starts.
Should adults get the chickenpox vaccine?
Adults who never had chickenpox and were never vaccinated can get the varicella vaccine, usually in two doses. A doctor can check your immunity first and advise whether it is right for you.
