Definition
Variolization is essentially the same as variolation: an early method of immunization against smallpox where material from smallpox sores is introduced to a healthy person. It's like a controlled exposure to a dangerous substance. This aimed to cause a mild case of smallpox, leading to immunity. This predates modern vaccination but involved significant risks. It's the historical precursor to safer immunization methods. Think of it as a high-stakes gamble with immunity.