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J Clin Microbiol. 1991 October; 29(10): 2291-2295

Platelia-Toxo IgA, a new kit for early diagnosis of congenital toxoplasmosis by detection of anti-P30 immunoglobulin A antibodies.

Centre d'Immunologie et de Biologie Parasitaire, Unité Mixte INSERM U 167-CNRS 624, Institut Pasteur, Lille, France.

ABSTRACT

With the aim of achieving earlier diagnosis of congenital toxoplasmosis, anti-P30 immunoglobulin A (IgA) antibodies were assayed by using a Platelia-Toxo IgA kit with samples from 72 children born to mothers who seroconverted during pregnancy. A total of 148 serum samples and 1 cerebrospinal fluid samples were from 23 congenitally infected children (2 serum samples were collected from fetuses), and 74 serum samples were from 49 uninfected children. Among the 23 infected children, anti-P30 IgA antibodies were present in all infants either at birth or in the following weeks, whereas anti-P30 IgM antibodies were present in 13 from the 23 infected children either at birth or in the following weeks. Serum samples collected in utero from two infected children were also tested. One of these samples was positive for both anti-P30 IgA and anti-P30 IgM antibodies, whereas both children were negative at birth for these antibodies. Neither anti-P30 IgA nor anti-P30 IgM antibodies were detected in 47 of 49 uninfected children. These results suggest that detection of anti-P30 IgA antibodies by the Platelia-Toxo IgA kit is a very effective method for early diagnosis of congenital toxoplasma infection.

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