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Latex agglutination assay of human immunoglobulin M antitoxoplasma antibodies which uses enzymatically treated antigen-coated particles.

Authors :
Cambiaso CL
Galanti LM
Leautaud P
Masson PL
Source :
Journal of clinical microbiology [J Clin Microbiol] 1992 Apr; Vol. 30 (4), pp. 882-8.
Publication Year :
1992

Abstract

An assay of immunoglobulin M (IgM) antitoxoplasma antibodies which is rapid (less than 30 min), homogeneous, and reliable (interassay coefficient of variation, less than 11%) is proposed. Its principle is based on the observation that a suspension of latex particles coated with toxoplasma antigens, after treatment with proteinase K, becomes less agglutinable by IgG antibodies but more agglutinable by IgM antibodies. The difference between the activities of the two classes of antibodies is increased by the addition of a monoclonal antibody directed against the Fc region of IgM. Agglutination is measured with a special instrument which optically counts the particles that remain free after the reaction. Turbidimetric reading, although less sensitive, is also suitable. No significant interferences either by IgG antitoxoplasma antibodies or by rheumatoid factor or antinuclear antibodies were observed. The sensitivity was similar to that of the immunosorbent agglutination assay.

Details

Language :
English
ISSN :
0095-1137
Volume :
30
Issue :
4
Database :
MEDLINE
Journal :
Journal of clinical microbiology
Publication Type :
Academic Journal
Accession number :
1572975
Full Text :
https://doi.org/10.1128/jcm.30.4.882-888.1992