Mike, you cannot catch shingles. It is the same virus as the chickenpox virus so it is possible to catch chickenpox from someone who has shingles, but only if you have never had chickenpox before. The virus remains in the system after a chickenpox infection and can later re-emerge as shingles during times of stress, poor health etc. Therefore you can have chickenpox and shingles, but you cannot have chickenpox more than once. You have only copied part of Alex's quote, which takes it out of context - what she said was
As I understand it, you can catch chickenpox from a person who has shingles, but not shingles......that is assuming that you have not had chicken pox before. If you have had chickenpox , you are at no risk.
You can catch chickenpox from a person who has shingles....if you have had chickenpox you are at no risk. Does that make it clearer?