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HAA

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abbreviation for
hepatitis-associated antigen; an antigen that occurs in the blood serum of some people, esp those with serum hepatitis
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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