My brother (11) sister (14) and I (18) have never gotten chickenpox or the vaccine before. Could this just be luck or could we be immune to it? And how many people are immune to chickenpox without having it before? I know they say 90-99% of adults are immune because they had it as children, what about those who did not?The reason I ask is because my grandma was just diagnosed with shingles and I wanted to visit her. For safety's sake I'm not going to know, but it got me wondering.Oops, meant *now*