I think what the nurse meant is that it is currently unknown how long the chickenpox vaccine is effective - in other words - for life? - or will you need chickenpox boosters as you get older?
Someone who has not had chickenpox can be infected with chickenpox if they come in contact with someone who has shingles.
On the other hand, I don't believe it is possible for someone who has chickenpox or shingles to re-infect someone who has already had chickenpox or shingles.
In the USA, chickenpox vaccinations began in 1995, so almost everyone over the age of 25 has had chickenpox.
Don't think so, but that ain't the weird part. As I explained in my reply #66, she said:
1. If you never get chickenpox or the vaccine, you will never get shingles.
2. If you never get chickenpox, but get the vaccine, you may get shingles.
3. The same vaccine that may give you shingles in a higher dose later in life may keep you from getting shingles.
I ain't no doctor so I don't know if any of this is right but I find the whole matter convoluted and borderline ridiculous.
Note: This all refers to Zostavax, it happened long before Shingrix was introduced.