How does the varicella zoster spread?

Spread by.. Varicella zoster (chicken pox, shingles, zoster) spread by contact exposure and very rarely by airborne droplets.
Airborn/ contact. The varicella virus is passed by new active cases by droplet (cough or secretions) and by contact with debris from blisters. It is estimated that as few as 30 minutes in a room with a kid with chicken pox may spread it to susceptable persons.