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Journal of Clinical Microbiology, June 2001, p. 2267-2271, Vol. 39, No. 6
Service de Parasitologie-Mycologie, CHU
Hôpital Maison Blanche, UPRES EA 2070, IFR53, 51092,
Reims,1 Service de
Parasitologie-Mycologie, Groupe Hospitalier de la Timone, 13385,
Marseille,2 Laboratoire de
Parasitologie-Mycologie, CHU Rangueil, 31054,
Toulouse,6 Laboratoire de
Parasitologie-Mycologie, Hôpital de I'Archet, 06202,
Nice,7 Laboratoires d'analyses
de Biologie Médicale Levy, 75014 Paris,10 Laboratoire de Microbiologie,
CH Saint Philibert, 59462, Lomme,12
Service de Parasitologie-Mycologie, CHU A. Michallon,
38043, Grenoble,14 and Institut
de Parasitologie et de Pathologie Tropicale, INSERM U 392, 67000,
Strasbourg,15 France; Staten Serum
Institut 5 Artillerivej, 2300 Copenhagen,3
and Department of Gynecology and Obstetrics, University
Hospital Hvidovre, 2650 Copenhagen,4
Denmark; Institut de Microbiologie, 1011 Lausanne,
Switzerland5; Department of
Medical Microbiology, St. George's Hospital,
London,8 and Public Health
Laboratory, Singleton Hospital, Swansea SA2
80A,11 United Kingdom; Clinique
ParaUnivers Saint Pierre, 1340 Ottignies,
Belgium9; and Institut für
Virologie, Infektiologie und Epidemiologie, 70193 Stuttgart,
Germany13
Received 15 December 2000/Returned for modification 1 February
2001/Accepted 2 April 2001
In a study involving 14 laboratories supported by the European
Community Biomed 2 program, we evaluated immunologic methods for the
postnatal diagnosis of congenital toxoplasmosis (CT). Among babies born
to mothers who seroconverted to positivity for toxoplasmosis during
pregnancy, we analyzed 55 babies with CT on the basis of persistent
anti-Toxoplasma immunoglobulin G (IgG) at 1 year of life
and 50 control babies without anti-Toxoplasma IgG at 1 year
of life in the absence of curative treatment with pyrimethamine-sulfonamides. We tested in-house methods such as the
enzyme-linked immunofiltration assay (ELIFA) or Immunoblotting (IB) for
the detection of IgG or IgM; these methods allowed comparison of the
immunologic profiles of the mothers and the infants. We compared ELIFA
and IB with a commercial enzyme immunoassay (EIA) or in-house
immunosorbent agglutination assay (ISAGA) for the detection of IgM or
IgA. The performances of combinations of methods were also assessed. A
cumulative sensitivity of 98% during a 1-year follow-up was obtained
with the ELIFA plus ISAGA combination. Only one case of CT was missed
by the ELIFA plus ISAGA combination, whereas three cases were missed by
the IB plus ISAGA combination, even though 48% of patients with CT
were treated with pyrimethamine-sulfonamides, which are known to
inhibit antibody neosynthesis. A similar performance was obtained with
either ELIFA or IB in combination with EIA. The difference in
performance between ELIFA plus ISAGA and IB plus ISAGA was not
statistically significant (P = 0.31), and we conclude
that both combinations of tests can be used for the diagnosis of CT in newborns.
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.6.2267-2271.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Strategy for Diagnosis of Congenital Toxoplasmosis:
Evaluation of Methods Comparing Mothers and Newborns and Standard
Methods for Postnatal Detection of Immunoglobulin G, M, and A
Antibodies
*
Corresponding author. Mailing address: Institut de
Parasitologie et de Pathologie Tropicale, INSERM U 392, 3 rue Koeberle, 67000, Strasbourg, France. Phone: 00 33 (0) 388 35 35 55. Fax: 00 33 (0) 388 36 42 02. E-mail:
ermanno.candolfi{at}medecine.u-strasbg.fr.
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