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Chickenpox is infectious from one to two days before the rash starts, until all the blisters have crusted over (usually five to six days after the start of the rash).hickenpox is infectious from one to two days before the rash starts, until all the blisters have crusted over (usually five to six days after the start of the rash).
How Long Is Chicken Pox Contagious? Chicken pox is caused by the varicella-zoster virus and causes an itchy, blistering, rash. Knowing how to prevent the spread and transmission of chicken pox is important during an outbreak and also when a vaccine is given.