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Agglutination of red blood cells.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the agglutination and subsequent precipitation of red blood cells, caused by hemagglutinins, bacteria, viruses, and agents capable of being adsorbed onto the surface of red blood cells.

Clusters of red blood cells, distinguishable to the naked eye as heaps, lumps, and clumps, are formed during hemagglutination. Hemagglutination is caused by the interaction of the agglutinogens present in red blood cells with plasma that contains agglutinins. Each agglutinogen has a corresponding agglutinin. The term “isohemagglutination” is used to designate the hemagglutination that takes place during the interaction of different blood groups in animals of the same species; “heterohemagglutination” is the term applied to the process in animals of different species. The laws of blood transfusion and identification of blood groups are based on the hemagglutination reaction. After the transfusion of incompatible blood, hemagglutination may occur in the bloodstream and cause severe (sometimes fatal) complications. In forensic medicine the hemagglutination reaction is used to determine the source of blood stains and as an additional test in cases of disputed paternity. In microbiology and immunology, the hemagglutination reaction is used to determine antiserum activity, for example, or type of virus. A distinction is made between active hemagglutination, which is caused by the direct action of an appropriate agent on the red blood cells, and passive hemagglutination, caused by a specific antiserum to the antigen previously adsorbed by the red blood cells. Hemagglutination may be caused by antibodies acting against one’s own red blood cells (auto-hemagglutination) or against red blood cells of the same species (homoagglutination) as well as by the polysaccharides of the causative bacteria of tuberculosis, plague, and tularemia, by the polysaccharides of the colon bacillus, and by the viruses of influenza, mumps, pneumonia of white mice, swine and horse influenza, smallpox vaccine, yellow fever, and other diseases.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
When mice began to show signs of illness, the brain tissue was examined for West Nile virus by hemagglutination (HT) and hemagglutination inhibition tests (HIT).
Since 1964, seroepidemiologic studies with the hemagglutination inhibition test (HI) have been conducted routinely for clinically suspected cases.
These were confirmed only serologically, by the hemagglutination inhibition test.
We then tested AIV-seropositive backyard flocks for H5 antibodies by using the same IDVet ELISA kit, and we used hemagglutination inhibition tests to detect clade H5 or other H5 Eurasian viruses (Appendix Table 1, https://wwwnc.cdc.gov/EID/article/25/3/18-1040App1.pdf).
Serum specimens of occupational population were collected and detected antibody levels for H5N1 and H7N9 by hemagglutination inhibition tests, respectively.

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