Historical medical term for inoculation against smallpox using material from human smallpox lesions, practiced before modern vaccination. Also referred to as 人痘種痘法.
See also: 人痘種痘法
During the Edo period, variolation was used to prevent smallpox.
Compound of 人痘 (human smallpox) + 接種 (inoculation) + 法 (method). The term reflects the historical practice of using human smallpox material for immunization.