What did Baruch s Blumberg that later won him a nobel prize in 1976?

Baruch Samuel Blumberg (*July 28, 1925 - *April 5, 2011) was an American physician, geneticist, and the discoverer of the hepatitis B virus (HBV) and its association with liver cancer.

Blumberg and his colleagues initially characterized the presence of Australia antigen in the serum of an Aboriginal Australian in Western Australia. Australia antigen was later found to be a marker of hepatitis B infection.

For this discovery, he shared the 1976 Nobel Prize in Physiology or Medicine with Daniel Carleton Gajdusek.