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The first symptoms of chickenpox usually develop about 14 to 16 days after contact with a person infected with the virus. Most people feel sick and have a fever, a decreased appetite, a headache, a cough, and a sore throat. The itchy chickenpox rash usually appears about 1 or 2 days after the first symptoms start. After a chickenpox red spot appears, it usually takes about 1 or 2 days for the spot to go through all its stages.
Most people have chickenpox as a child. Most children get chickenpox before the age of 10. About 9 in 10 people have had it by the age of 15. It is uncommon for adults to have chickenpox.hickenpox causes spots (a rash) and can make you feel unwell. Symptoms tend to be worse in adults than in children. Treatments can ease the symptoms until the illness goes. An antiviral drug may limit the severity of the illness if the drug is started within 24 hours of the rash first starting.