Triple bladed vaccination lancet, London, England, 1822-1875
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The introduction of vaccine into the body for the purpose of inducing immunity. Coined originally to apply to the injection of smallpox vaccine, the term has come to mean any immunising procedure in which vaccine is injected.
A surgical instrument of various forms, commonly sharp-pointed and two-edged. The lancet is used in venesection (the act of opening a vein for bloodletting), and in opening abscesses.
Clear, slightly yellowish fluid derived from the blood and similar in composition to plasma. Lymph conveys white blood cells and some nutrients to the tissues.
Smallpox is an infectious virus unique to humans. It results in a characteristic skin rash and fluid-filled blisters. After successful vaccination campaigns throughout the 1800s and 1900s, the World Health Organisation certified the eradication of smallpox in 1979. Smallpox is the only human infectious disease to have been completely wiped out.