I don't think theres any inherent danger in the vaccine itself however, I do believe they hype up the danger of certain illnesses to sell vaccines. Theres a scare and a new vaccine for it every 3-4 years. This new "chinese" flu could be limited to a few thousand people half way across the world but they will make it seem like the new bird flu to sell their wares.
Now if the time comes when they decide to sneak some kinda computer chip or nano device into you for whatever reason, vaccines are the way to go