He was a physician. He lived in the 8^th century. His work is the Nidana.

Contributions

Ayurvedic innoculation for smallpox. Treatment was done by inoculation with year-old smallpox matter. The inoculators would travel all across India pricking the skin of the arm with a small metal instrument using “variolous matter” taken from pustules produced by the previous year’s inoculations. The effectiveness of this system was confirmed by the British doctor Howell based on his residence in Bengal.

Classification of diseases, causes, symptoms and complications

Chapter on Masurika (Small Pox)