having received a vaccine to protect against a disease; the treatment where a weakened or inactive form of a disease is given to build immunity.
From Latin 'vacca' (cow), because the first vaccine (against smallpox) used material from cowpox. Edward Jenner developed it in 1796, and the term 'vaccination' was coined to honor this origin.
Jenner's 1796 cowpox experiment was shockingly unethical by modern standards—he tested the vaccine on an 8-year-old boy—yet it led to the eradication of smallpox, one of humanity's greatest medical achievements and proof that vaccines save millions of lives.
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