Chickenpox is very infectious and spreads from person to person by direct contact with fluid from the rash or through the air from an infected person’s cough or sneeze. A person with chickenpox is contagious from 1-2 days before the rash appears until all blisters have formed scabs. It takes from 10-21 days after contact with an infected person for someone to develop chickenpox (this is the incubation period).
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