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1996-02-26
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Document 0655
DOCN M9620655
TI Value of specific immunoglobulin A detection by two immunocapture assays
in the diagnosis of toxoplasmosis.
DT 9602
AU Foudrinier F; Marx-Chemla C; Aubert D; Bonhomme A; Pinon JM; Laboratoire
de Parasitologie-Mycologie, Institut National de la; Sante et de la
Recherche Medicale U314, Centre Hospitalier; Universitaire, Hopital
Maison Blanche, Reims, France.
SO Eur J Clin Microbiol Infect Dis. 1995 Jul;14(7):585-90. Unique
Identifier : AIDSLINE MED/96047083
AB The diagnosis of Toxoplasma gondii infection is currently based on
immunological tests, but tests for IgG and IgM antibodies alone are
often insufficient to assess the risk of active disease, especially
during pregnancy and in immunodeficient subjects. The supplementary
diagnostic value of testing for antitoxoplasmic IgA in cases of acute,
chronic, congenital and reactivated toxoplasmosis, relative to classical
immunological tests, was evaluated using two immunocapture tests, one
based on tachyzoite agglutination and the other on an immunoenzymatic
complex recognizing the membrane protein P30 of Toxoplasma gondii. A
total of 4,541 sera from 395 uninfected subjects, 468 immunized subjects
with chronic infection, 117 subjects with acute infection and 403
children, 103 of whom had congenital toxoplasmosis, was tested. Specific
IgA tests were negative in the nonimmune population, but tests for this
immunoglobulin subtype became positive very rapidly during primary
infection, and IgA disappeared more rapidly than IgM. In the children
infected in utero, specific IgA was detected more frequently than IgM.
In contrast, in a population of HIV-seropositive subjects with clinical
toxoplasmosis, tests for IgA were poorly sensitive. The two tests for
specific IgA produced similar results, except in the early stages of
primary infection, in which immunoenzymatic testing for anti-P30 IgA was
less sensitive than the agglutination method.
DE Agglutination Tests Animal Antibodies, Protozoan/*BLOOD Child Child,
Preschool Female Human IgA/*BLOOD Immunoenzyme Techniques Infant
Infant, Newborn Mice Pregnancy Support, Non-U.S. Gov't
Toxoplasma/*IMMUNOLOGY Toxoplasmosis/*DIAGNOSIS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).