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Cytomegalovirus complement-fixing IgM antibody.

J C Booth, G Hannington, Y Tryhorn

    Journal of Medical Virology
    |January 1, 1980
    PubMed
    Summary
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    Researchers identified Cytomegalovirus (CMV)-specific IgM antibodies in patients with primary CMV infection. These IgM antibodies fix complement and are detectable using specific viral antigens, aiding in diagnosing CMV infections.

    Area of Science:

    • Virology
    • Immunology
    • Infectious Diseases

    Background:

    • Cytomegalovirus (CMV) is a common virus that can cause serious illness in immunocompromised individuals.
    • Diagnosing primary CMV infection often relies on detecting specific antibodies in patient sera.
    • Understanding the characteristics of CMV-specific antibodies is crucial for accurate serological diagnosis.

    Purpose of the Study:

    • To characterize Cytomegalovirus (CMV)-specific IgM antibodies in patients experiencing primary CMV infection.
    • To determine the complement-fixing ability and antigen-binding properties of these IgM antibodies.

    Main Methods:

    • Sera from five patients with primary CMV infection were analyzed.
    • Complement fixation (CF) tests were performed on serum IgM fractions.

    Related Experiment Videos

  • Antibody behavior was assessed after absorption with aggregated IgG and treatment with 2-mercaptoethanol.
  • Detection assays utilized crude cell-extract antigens, purified enveloped-virion antigen, and CMV-soluble antigens.

    • Main Results:

    • Cytomegalovirus (CMV)-specific IgM that fixes complement was demonstrated in patient sera.
    • The complement fixation reaction was present in the IgM fractions.
    • The reaction was unaffected by aggregated IgG absorption but abolished by 2-mercaptoethanol treatment, confirming IgM specificity.
    • IgM antibodies were detected using crude cell-extract and purified enveloped-virion antigens, but not with soluble CMV antigens.

    Conclusions:

    • Cytomegalovirus (CMV)-specific IgM antibodies capable of complement fixation are indicative of primary CMV infection.
    • The use of crude cell-extract or purified enveloped-virion antigens is effective for detecting these diagnostic IgM antibodies.
    • These findings support the utility of specific IgM detection in the serological diagnosis of CMV infections.