Varicella
Chickenpox, or varicella, is a highly contagious infection caused by varicella-zoster virus. It typically causes an itchy blistering rash. Although many people recover without major problems, illness can be serious, especially in babies, adults, pregnant people, and those with weakened immune systems. After recovery, the virus can remain in the body and later cause shingles.
Prevention: Vaccine
Symptoms
- An itchy rash that becomes fluid-filled blisters
- New spots appearing while other blisters form scabs
- A rash that often begins on the chest, back, or face before spreading
- Sometimes fever and feeling unwell before the rash
Transmission
- Breathing in virus particles or touching blister fluid from someone with chickenpox
- Contact with blister fluid or inhaling virus particles from shingles blisters can cause chickenpox in someone without protection
Prevention
Vaccination helps prevent chickenpox and severe illness. Avoid intentionally exposing children to infection. An infected person can spread the virus before the rash appears and until the lesions have crusted; follow professional advice about avoiding contact with others.
Diagnosis and care
A healthcare professional can advise on symptom relief and whether antiviral treatment is needed. People at increased risk of severe illness should seek advice promptly.
Source
- About Chickenpox
Based on CDC information
Source language: English
Source reviewed: April 22, 2024
Source accessed: May 17, 2026
- CDC: Clinical Overview of Chickenpox (Varicella)
Based on CDC information
Source language: English
Source accessed: October 7, 2026
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