hi,
all those with compromised immune systems should avoid contact with chickenpox, even if you have had it already. the virus is close to if not identical to that which causes shingles.
for those that have had transplants developing shingles can be problematic. it is a very unpleasant virus at the best of times even for the 'healthy'......
however, if you have a normal(ish) white cell count, as most on glivec do, then you should not worry about it.
i think you should just be aware and not put yourself at risk if you can possible avoid it.
hope this answers your question,
try this link to wikipedia
en.wikipedia.org/wiki/Shingles
sandy C ;o)