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  2. Blood compatibility testing - Wikipedia

    en.wikipedia.org/wiki/Blood_compatibility_testing

    In a rare phenomenon known as "acquired B antigen", a patient whose true blood type is A may show a weak positive result for B in the forward grouping. This condition, which is associated with gastrointestinal diseases such as colon cancer [ 1 ] : 139 and intestinal obstruction , [ 24 ] : 126 results from conversion of the A antigen to a ...

  3. ABO blood group system - Wikipedia

    en.wikipedia.org/wiki/ABO_blood_group_system

    The cis-AB phenotype has a single enzyme that creates both A and B antigens. The resulting red blood cells do not usually express A or B antigen at the same level that would be expected on common group A 1 or B red blood cells, which can help solve the problem of an apparently genetically impossible blood group. [33]

  4. Blood type - Wikipedia

    en.wikipedia.org/wiki/Blood_type

    A complete blood type would describe each of the 45 blood groups, and an individual's blood type is one of many possible combinations of blood-group antigens. [3] Almost always, an individual has the same blood group for life, but very rarely an individual's blood type changes through addition or suppression of an antigen in infection, malignancy, or autoimmune disease.

  5. Diego antigen system - Wikipedia

    en.wikipedia.org/wiki/Diego_antigen_system

    The Diego antigen (or blood group) system is composed of 21 blood factors or antigens carried on the Band 3 glycoprotein, also known as Anion Exchanger 1 (AE1). The antigens are inherited through various alleles of the gene SLC4A1 ( Solute carrier family 4), located on human chromosome 17 .

  6. Adaptive immune system - Wikipedia

    en.wikipedia.org/wiki/Adaptive_immune_system

    Artificially Acquired Active Immunity – is done by vaccination (introducing dead or weakened antigen to the host's cell). Artificially Acquired Passive Immunity – This involves the introduction of antibodies rather than antigens to the human body. These antibodies are from an animal or person who is already immune to the disease.

  7. Do at-home flu tests really work? Here's everything you need ...

    www.aol.com/lifestyle/home-flu-tests-really...

    The FDA says that at-home COVID antigen tests are less precise than molecular tests (i.e., the PCR tests that needed to be done in a hospital or clinic), and false negatives may be more likely to ...

  8. Rh blood group system - Wikipedia

    en.wikipedia.org/wiki/Rh_blood_group_system

    Rh antibodies are Immunoglobulin G (IgG) antibodies which are acquired through exposure to Rh-positive blood (generally either through pregnancy or transfusion of blood products). The D antigen is the most immunogenic of all the non-ABO antigens.

  9. Severe combined immunodeficiency - Wikipedia

    en.wikipedia.org/wiki/Severe_combined...

    Severe combined immunodeficiency (SCID), also known as Swiss-type agammaglobulinemia, is a rare genetic disorder characterized by the disturbed development of functional T cells and B cells caused by numerous genetic mutations that result in differing clinical presentations. [2]