Chicken pox is actually only infectious for 48 to 72 hours before the spots break out. I think Zoe may be getting confused with the incubation period which is 2 to 3 weeks. (Hope that doesn't sound rude x)
It then remains infectious until all the blisters have scabbed over as has been said (usually about 5 to 7 days).
It can be spread by contact or via droplets in the air. You can get chicken pox more than once although this is unlikely and depends on how severe the first time was. (My son has had them twice, I have never had them)
Once they have gone the virus lies dormant in the body for life. It can resurface in the future in the form of Shingles, this usually only happens in adults but can happen in kids.
As has already been said exclusion is usually until blisters have scabbed.
Probably more info than you were looking for, lol!
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