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an antigen so called because first recognized in an Australian aborigine, but now known to be a subunit of the hepatitis B virus surface antigen.
1 an envelope antigen known as hepatitis B surface antigen (HBsAg), found in acute or chronic hepatitis B. See also hepatitis.
2 a serological marker on the surface of the hepatitis B virus.
Australia antigen, Australian antigen
A term formerly used for hepatitis B surface antigen.
See also: antigen