I heard the same thing. We had to go see my husband's grandmother who, at the time, was in her 2nd year of active shingles. Our son was 3 at the time so we wanted to protect him as much as possible. As a result, we got his 2nd chicken pox vaccine about a month before we went on the trip. Our doctor said if the shingles has an open wound it can give someone chicken pox if they have not had it nor had the 2 vaccines.
About the shingles vaccine, it is not available to those under 60 and those over 60 have to go a year with no active break out before they can get it. My mom has had 2 cases of shingles - the 2nd one was last Aug and she's over 60 now. Once the year passes, then they will let her get the vaccine.