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Assessment of an In-House Enzyme-Linked Immunosorbent Assay and Igg Avidity Test Based on Sag1 and Gra7 Proteins for Discriminating Between Acute and Chronic Toxoplasmosis in Humans Publisher Pubmed



Teimouri A1 ; Afshar MJA2, 3 ; Mohtasebi S2 ; Azami SJ2 ; Alimi R4 ; Keshavarz H2, 5
Authors
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Authors Affiliations
  1. 1. Department of Parasitology and Mycology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
  2. 2. Department of Medical Parasitology and Mycology, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Medical Parasitology and Mycology, School of Medicine, Jiroft University of Medical Sciences, Jiroft, Iran
  4. 4. Healthy Ageing Research Center, Neyshabur University of Medical Sciences, Neyshabur, Iran
  5. 5. Center for Research of Endemic Parasites of Iran, Tehran University of Medical Sciences, Tehran, Iran

Source: Journal of Clinical Microbiology Published:2021


Abstract

To improve serodiagnostic methods for diagnosis of acute from chronic toxoplasmosis, an economical in-house enzyme-linked immunosorbent assay (ELISA) for measuring Toxoplasma-specific IgG, IgM, and IgG avidity has been developed and assessed based on use of various Toxoplasma gondii antigens, including SAG1, GRA7, and a combination of SAG1 and GRA7 (SAG1+GRA7), as well as Toxoplasma lysate antigens (TLAs). Performances of in-house IgM, IgG, and IgG avidity assays were compared to those of ELISA commercial kits and VIDAS Toxo IgG avidity. A set of 138 sera from patients with acquired T. gondii infection and seronegative people were assessed. Receiver operating characteristic (ROC) analysis revealed an area under curve (AUC) of 0.98, 0.97, 0.99, and 0.99 for IgM-TLAs, IgM-SAG1, IgM-GRA7, and IgM-SAG1+GRA7, respectively. Furthermore, AUC was calculated as 0.99, 0.99, 0.98, and 0.99 for IgG-TLAs, IgG-SAG1, IgG-GRA7, and IgG-SAG1+GRA7, respectively. The current study showed that GRA7 included 100% sensitivity for the detection of Toxo IgM, while SAG1 included 89.7% sensitivity. Furthermore, the highest specificity (97.2%) to detect Toxo IgM was achieved using SAG1+GRA7 antigen. For the detection of Toxo IgG, the highest sensitivity (100%) was recorded for SAG1+GRA7, followed by TLAs (97.9%). The SAG1+GRA7 showed the greatest potential for assessing avidity of IgG antibodies, with 97.1% sensitivity and 96.6% specificity compared to those of VIDAS Toxo IgG avidity. The preliminary results have promised better discriminations between acute and chronic infections using a combination of SAG1 and GRA7 recombinant antigens compared to those using TLAs. © 2021 American Society for Microbiology. All Rights Reserved.
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