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  • Title: Serologic diagnosis of toxoplasmosis with emphasis on the detection of Toxoplasma-specific immunoglobulin M antibodies.
    Author: Fung JC, Clogston A, Swenson P, Kaplan M.
    Journal: Am J Clin Pathol; 1985 Feb; 83(2):196-9. PubMed ID: 3881928.
    Abstract:
    Commercially available kits were used for the detection of Toxoplasma-specific IgM antibodies. False positive IgM results were observed in whole sera containing Toxoplasma-specific antibodies together with rheumatoid factor when tested by immunofluorescence (IFA). False negative IgM results occurred in whole sera containing competing levels of Toxoplasma-specific IgG antibodies, as indicated by the IFA:IgM-M ratio. False positive and false negative IgM results often occurred when whole sera were tested. These false reactions were eliminated by fractioning IgM from IgG using the Isolab's IgM Isolation System. All five sera in this study with an IFA titer to Toxoplasma of greater than or equal to 1:16,384 also contained Toxoplasma-specific IgM antibodies. This suggests that sera with high titers to Toxoplasma should be tested for Toxoplasma-specific IgM antibodies.
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