i dont know if that assumption can be made. as certainly in my generation in the UK it was the given we all had our vaccines. i cant think of a single person in the 260 people i went to secondary school who didnt have the vacines we were offered then and to my knowledge only 2 of us have CFS.
i dont think that modern medicine is the healthiest thing for us to be using. but i also think that if you posted on any forum whether it be full of sick people, football fans or photographers you wouldnt find anyone who has never had a vaccine or pharmasutical drug.