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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.
It normally takes 14 days for the symptoms of chickenpox to show after you have come into contact with the virus. However, this can vary from person to person â from as little as 7 days, up to 21 days. This is called the incubation period.Someone with chickenpox is most infectious from one to two days before the rash appears, until all the blisters have crusted over. This usually takes five to six days from the start of the rash. Read more about the diagnosis of chickenpox and how to stop chickenpox spreading.owever, this can vary from person to person â from as little as 7 days, up to 21 days. This is called the incubation period. Someone with chickenpox is most infectious from one to two days before the rash appears, until all the blisters have crusted over.