variolation

Variolation was an old method used to protect people from smallpox by deliberately giving them a very mild form of the disease.

• How it was done: Material (like dried scab or pus) from a smallpox sore was put into a small scratch on a healthy person’s skin.
• Why it could work: If the person got only a mild infection and recovered, their immune system “remembered” the germ and could fight smallpox better later (a kind of acquired immunity).
• Who did it: In India, people who carried out this practice were called teekedaars.
• Important difference from vaccines: Variolation used the actual smallpox material, while modern vaccines use weakened/killed germs or harmless parts—so vaccines are designed to be much safer.
• Risk involved: Because it used real smallpox, variolation could sometimes cause a serious case and could also spread the disease to others.

Variolation is remembered as an early step in the journey toward modern vaccination—showing that people understood, even long ago, that the body can be “trained” to fight disease.