Yes, adults can get chickenpox, and it is usually more serious than in children
If you never had chickenpox as a child and were not vaccinated, you can catch it as an adult. The virus does not care how old you are—it spreads the same way through respiratory droplets or direct contact with the rash. What changes with age is how hard the infection hits. Adults tend to develop higher fevers, more extensive rashes, and are at greater risk for complications like pneumonia, encephalitis (brain inflammation), and bacterial skin infections.
The risk of hospitalization from chickenpox rises sharply in adults compared to children. People over 20 have roughly 10 times the rate of pneumonia as a complication. Pregnant women, people with weakened immune systems, and those taking certain medications face even steeper risks. This is why knowing your chickenpox status matters—and why prevention through vaccination is the standard recommendation for unprotected adults.
Key Takeaways
- Adults without prior chickenpox infection or vaccination can catch the virus and typically experience more severe symptoms than children do.
- Complications like pneumonia and encephalitis occur more often in adults, and hospitalization rates are significantly higher.
- A blood test can tell you whether you are immune from past infection or vaccination, or whether you remain unprotected.
- The chickenpox vaccine is available for unprotected adults and is given as two doses spaced four to six weeks apart.
- If you are exposed to chickenpox, antiviral medication started within 24 hours can reduce severity and shorten the illness.
How to know if you are protected against chickenpox
Most adults born in the United States before the 1990s either had chickenpox as a child or do not remember whether they did. If you fall into that group, you are probably immune—but "probably" is not the same as knowing. A blood test called a varicella titer measures antibodies to the chickenpox virus and gives you a definitive answer: immune or not immune.
Ask your primary care doctor for a varicella titer test. It is a standard blood draw, and results usually come back within a few days. If the test shows you are immune, you are done. If it shows you are not immune, you have a clear reason to consider vaccination. Some workplaces, schools, and healthcare settings require proof of immunity or vaccination, so having the test result on file can be useful.
Vaccination for unprotected adults
The chickenpox vaccine (varicella vaccine) is given as two shots spaced four to six weeks apart. After both doses, protection rates are around 90 percent against any chickenpox infection and over 95 percent against severe disease. You can receive the vaccine at your primary care doctor's office, an urgent care clinic, or a pharmacy with a vaccination service.
The vaccine is not recommended if you are pregnant, so if you are planning pregnancy and know you are unprotected, vaccination before conception is the right time. If you are already pregnant and unprotected, you cannot receive the vaccine during pregnancy, but you can receive it after delivery. People with severely weakened immune systems should discuss vaccination with their doctor, as the live vaccine may not be appropriate for them.
What happens if an unprotected adult is exposed to chickenpox
If you know you are unprotected and have been around someone with chickenpox, contact your doctor within 24 hours. An antiviral medication called varicella-zoster immune globulin (VariZIG) or high-dose antiviral drugs like acyclovir can be given after exposure to prevent infection or reduce its severity. The sooner you get treatment after exposure, the more effective it is—waiting more than a few days makes it less likely to work.
If you cannot reach your doctor immediately, call an urgent care clinic or your local health department. They can advise you on whether post-exposure treatment is right for your situation. Do not wait to see if you develop symptoms; the window for prevention is narrow.
Recognizing chickenpox symptoms in adults
Chickenpox starts with fever, fatigue, headache, and body aches—symptoms that feel like the flu. One to two days later, the characteristic rash appears, usually on the face, chest, and back first, then spreading to other parts of the body. The rash begins as red bumps, progresses to fluid-filled blisters, and then crusts over. New bumps continue to appear in waves over several days.
In adults, the rash is often more extensive and the fever higher than in children. Some adults develop a severe rash with hundreds of lesions. If you develop this pattern of fever followed by a spreading rash, especially if you know you were exposed to chickenpox, contact your doctor. Do not assume it is something minor—adult chickenpox needs medical attention.
Treatment and managing chickenpox as an adult
If you develop chickenpox as an adult, antiviral medication is standard treatment. Acyclovir, valacyclovir, or famciclovir are prescribed to reduce the severity of the infection and shorten how long you are sick. These work best when started within 24 hours of the rash appearing, so getting diagnosed quickly matters. Your doctor will prescribe the medication based on your age, weight, and kidney function.
Beyond antivirals, treatment focuses on managing symptoms: fever reducers like acetaminophen or ibuprofen, keeping the rash clean and dry, and avoiding scratching to prevent bacterial infection. Stay home and away from others until all blisters have crusted over—usually about a week after the rash first appears. If you develop difficulty breathing, severe headache, confusion, or signs of a skin infection (increasing redness, warmth, pus), seek emergency care.
Shingles risk after adult chickenpox
After you recover from chickenpox, the virus remains dormant in nerve tissue. Years or decades later, it can reactivate as shingles (herpes zoster), a painful rash that usually appears on one side of the body. Adults who get chickenpox for the first time are at risk for shingles later in life, just as people who had chickenpox as children are.
The shingles vaccine (Shingrix) is recommended for adults 50 and older and is also used for younger adults with certain conditions. If you develop adult chickenpox, ask your doctor about shingles vaccination once you have fully recovered. This is another reason why preventing chickenpox through vaccination in the first place is preferable to catching it as an adult.
Frequently Asked Questions
Can I catch chickenpox twice?
Reinfection is extremely rare. Once you have had chickenpox, your immune system remembers the virus and protects you for life. If you think you have had chickenpox twice, one of those episodes was likely a different illness with a similar rash, or you may not have had chickenpox the first time.
Is the chickenpox vaccine safe for adults?
Yes. The vaccine is a live but weakened virus, and serious side effects are uncommon. Most people experience mild arm soreness or low-grade fever after vaccination. Severe allergic reactions are rare. Discuss any concerns about your specific health situation with your doctor before vaccination.
What if I am pregnant and unprotected?
You cannot receive the vaccine during pregnancy because it is a live virus vaccine. After delivery, you can be vaccinated. If you are exposed to chickenpox while pregnant, contact your doctor immediately—antiviral treatment or immune globulin may be recommended to protect you and your baby.
How long does chickenpox last in adults?
The rash typically appears for about a week, with new bumps forming in waves. Most people feel sick for one to two weeks total. With antiviral treatment, symptoms resolve faster than without it. Some adults experience fatigue or weakness for several weeks after the acute illness ends.
Can I work or go to school if I have chickenpox?
No. You are contagious from about two days before the rash appears until all blisters have crusted over, usually seven to ten days after the rash starts. You must stay home during this time to avoid spreading the virus to others, especially unprotected people, pregnant women, and those with weakened immune systems.