Shingles is most contagious through open wounds. The rash is only the initial part of the infection.
http://www.shinglesremedy.co.uk/shingles-rash.php
Hello,
Shingles is an infection caused by the varicella-zoster virus, which is the virus that causes chickenpox. Shingles occurs in people who have had chickenpox and represents a reactivation of the dormant varicella-zoster virus. The first sign is usually a tingling feeling, itchiness, or stabbing pain on the skin. After a few days, a rash appears as a band or patch of raised dots in a particular dermatome.So shinglescannot spread from one dermatome to another just by touching.
Hope it helps.Take care and regards.
Except in the immuno suppressed shingles rash would be confined to a single nerve distribution only.No other way it spreads and the fears are unfounded.No worry please.