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It is an improvement on the Paul–Bunnell test. [2] The test is specific for heterophile antibodies produced by the human immune system in response to EBV infection. Commercially available test kits are 70–92% sensitive and 96–100% specific, with a lower sensitivity in the first two weeks after clinical symptoms begin. [3] [4]
Heterophile antibodies can cause significant interference in any immunoassay. [3] The presence of a heterophile antibody is characterized by broad reactivity with antibodies of other animal species (which are often the source of the assay antibodies). Such antibodies are commonly referred to as human anti-animal antibodies (HAAA).
Antibody to EBNA slowly appears 2 to 4 months after the onset of symptoms and persists for the rest of a person’s life. [10] When negative, these tests are more accurate than the heterophile antibody test in ruling out infectious mononucleosis. When positive, they feature similar specificity to the heterophile antibody test.
Quest Diagnostics is letting people sign up for antibody tests for the novel coronavirus online. Starting today, people in the US can order the tests on Quest's consumer testing site without ...
Other heterophile antigens are responsible for some diagnostic serological tests such as: Weil-Felix reaction for typhus fever; Paul Bunnell test for infectious mononucleosis; Cold agglutinin test in primary atypical pneumonia; Chemically, heterophile antigens are composed of lipoprotein-polysaccharide complexes.
For example, hemolysis, icterus, lipemia, or heterophile antibodies may confound results obtained by traditional methods such as ion-selective electrodes, enzymatic assays or immunoassays. Alternate methods such as blood gas analysers, point-of-care testing or mass spectrometry may help resolve the clinical question.
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The Forssman antigen is a glycolipid heterophile antigen found in certain animals like dogs, horses, cats, turtles and sheep, and enteric organisms such as pneumococci.In sheep, it is found on erythrocytes but not on tissue and organs, unlike hamsters and guinea pigs whose organ cells do carry the antigen.
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