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. 1997 Jun;35(6):1450–1453. doi: 10.1128/jcm.35.6.1450-1453.1997

Diagnosis of toxoplasmosis by joint detection of immunoglobulin A and immunoglobulin M.

M Arcavi 1, G Orfus 1, G Griemberg 1
PMCID: PMC229765  PMID: 9163460

Abstract

An indirect immunofluorescence test with total anti-human immunoglobulin conjugate (IgG,A,M-IIF) can be used for joint detection of immunoglobulin A (IgA) and IgM antibodies, provided serum IgG is previously absorbed with anti-human IgG. To determine the validity of the IgG,A,M-IIF assay with absorbed sera, the results obtained were compared with those obtained by methods routinely used for the detection of acute-phase markers, IgA and IgM IIF and enzyme immunoassay. Accordingly, 114 serum samples were selected from patients showing titers of > or = 1:1,024 by IgG,A,M-IIF. (i) In 90 of the samples, neither IgA nor IgM was detected by any of the methods employed; (ii) the remaining 24 samples showed IgA and/or IgM. In all cases, the IgG,A,M-IIF assay with absorbed sera was positive. These comparative data support the use of IgG,A,M-IIF, performed with absorbed and unabsorbed sera simultaneously, for determining the presence of specific IgG, IgA, and IgM by employing a single technique (IIF), one conjugate (anti-IgG,A,M), and only one sample (with and without previous absorption), thus providing a useful initial tool for the diagnosis of toxoplasmosis.

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Selected References

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