English physician and scientist (1749-1823) often called the ‘father of immunology,’ who successfully tested his smallpox inoculation in 1796. Ink signature, "Affectionately yours, E. Jenner, P.S. If your head gets better, the plan you are pursuing, go on with it,” on a white 4 x 2.75 slip clipped from an autograph letter; the reverse also bears writing in Jenner's hand. In fine condition, with central vertical and horizontal folds. Accompanied by two unsigned engravings and a provenance note indicating that the autograph was obtained from one of Jenner's family members.
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