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The word "not" was omitted from a sentence in the special contribution titled "Smallpox Immunization in the United States" (194:161-166 [Oct 11] 1965). On p 165, in the paragraph beginning "Vaccination Reaction," the third sentence should read "If this vesicle is not present, vaccination must be repeated with fresh vaccine applying a few more strokes of the needle."
Not Slip. JAMA. 1965;194(10):1048. doi:10.1001/jama.1965.03090230016003