- The definition of an australia antigen is a substance in the blood of some people with one form of hepatitus that causes the human body to make antibodies.
HBsAg is the name of the surface molecule that is found in the blood of people with Hepatitus B and is an example of the Australia-antigen.
Origin: because first identified inch(es) an Australian Aborigine
Used by arrangement with John Wiley & Sons, Inc.
australia antigen - Medical Definition