Is a person with chickenpox infectious ?
A person with chickenpox is very infectious. The virus spreads in the air from person to person. For example, if you have not already had chickenpox, you stand a good chance of catching it if:
* you are in the same room as someone with chickenpox for more than 15 minutes, or
* you have any "face-to-face" contact with someone with chickenpox , such as a conversation.
It takes 11-20 days to develop symptoms after catching the virus (the "incubation period").
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