after a person has been exposed to chickenpox how long till they are contagious?!

Question:

Answers:
A person infected with chickenpox can spread the virus before developing any symptoms. Chickenpox is most contagious from 2 to 3 days before the rash develops until all the blisters have crusted over.

Other Answers:
ABOUT A WEEK, IF YOU OR WHOMEVER HAS RECIEVED THE POX SHOT, THEY CAN STILL CARRY THE DIS, BUT IT WILL NOT SHOW ON THEIR BODY.

i thought there was a incubation period of three weeks
Answers:

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after a person has been exposed to chickenpox how long till they are contagious?!

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