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I received one when I was six and again when I was 18 in order to enter nursing school. They had a plastic shield with air holes to put over the lesion. It looked like the blister packaging you see today.
My children both received it when they were five. (son b. '70, dtr. b.'68)
I have given hundreds and hundreds of them and the reactions varied from none to raging fever and pain. One poor kid had acne really bad and in scratching he spread the vaccinia to several places on his neck and shoulders. I never heard of any of our patients dying.