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Understanding chickenpox
Audience: patients-public, students-learners ยท Review state: published
What it is
Chickenpox is a very contagious infection caused by the varicella-zoster virus. It used to be a near-universal childhood illness, but vaccination has made it far less common.
It is usually mild in healthy children, but it can be serious in newborns, adults, pregnant women, and people with weakened immune systems.
Symptoms and spread
The classic sign is an itchy rash of small fluid-filled blisters that appear in waves over several days, then form scabs. Fever, tiredness, and loss of appetite often come first.
The virus spreads easily through the air and by touching the blisters. A person is contagious from a day or two before the rash appears until every blister has crusted over, which is why children are kept home during that time.
Care at home
Most healthy children recover with simple care: rest, fluids, keeping nails short to limit scratching, and soothing measures such as cool baths and calamine lotion. Fever reducers may be used, but aspirin must never be given to children with chickenpox because of the risk of Reye's syndrome, a rare but dangerous reaction.
Scratching can cause skin infections and scarring, so itch control matters.
When to seek help, and prevention
Medical advice is needed if the ill person is an adult, a newborn, pregnant, or has a weakened immune system, or if there are signs of complications such as a high or persistent fever, spreading skin redness, confusion, stiff neck, or breathing difficulty. Antiviral medicines can help higher-risk patients when started early.
The chickenpox vaccine is the best protection and is part of routine childhood immunization in many countries. After infection, the virus stays dormant in the body and can reactivate years later as shingles.
Limitations
General educational overview, not medical advice and not a diagnosis. Higher-risk patients and any sign of complications need prompt medical care.