adjective Medicine/Medical.
showing a significant level of serum antibodies, or other immunologic marker in the serum, indicating previous exposure to the infectious agent being tested.

1930–35; sero- + positive Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seropositive (ˌsɪərəʊˈpɔzɪtɪv)
(of a person whose blood has been tested for a specific disease, such as AIDS) showing a serological reaction indicating the presence of the disease

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

seropositive se·ro·pos·i·tive (sēr'ō-pŏz'ĭ-tĭv)
Having a positive reaction to a serological test for a disease; exhibiting seroconversion.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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