Not only were vaccines stopped in the early 1970s (1972-3 IIRC), but the vaccine is not generally (possibly: legally) available in the US anymore. Putatively because of the epidemiologic risk -- there are a certain number of negative reactions, and deaths, from the vaccine, not worthwhile in an environment w/o live virus. However this does create a large susceptible population.
Also hear the vaccine needs to be boosted at ~30 year intervals, so that scar may not tell much of a story any more.