Personally I think it is a good idea. We don't live in Hong knog, but travel there frequently, and my husband loves to eat anything, the more exotic the better. He really loves street food too, where as I Don't tend to eat things like that. The children seem to be followinf his love of food, so for peace of mind I like them being protected. We also travel to some other areas of tthe world where Hep A is a problem.