Scholars at the National Archives of Nepal have successfully deciphered a rare 12th-century manuscript written in the Nevari script, unveiling a sophisticated system of preventative medicine. The text, titled Vyadhi-Prashamana, describes a form of early variolation or inoculation against smallpox-like pathogens using attenuated viral matter harvested from survivors, a technique previously thought to have matured much later.
This research, featured in the Journal of Sanskrit and Heritage Studies, highlights the advanced state of medical epistemology in the medieval Kathmandu Valley. The manuscript provides specific instructions on the purification of instruments and the seasonal timing of procedures, suggesting a deep empirical understanding of pathogen transmission and host immunity that predates Western immunology by several centuries.