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  • Title: Clonorchis sinensis omega-class glutathione transferases are reliable biomarkers for serodiagnosis of clonorchiasis and opisthorchiasis.
    Author: Kim JG, Ahn CS, Sripa B, Eom KS, Kang I, Sohn WM, Nawa Y, Kong Y.
    Journal: Clin Microbiol Infect; 2019 Jan; 25(1):109.e1-109.e6. PubMed ID: 29649604.
    Abstract:
    OBJECTIVES: To determine the potential for immunodiagnostic application of two recombinant forms of Clonorchis sinensis omega-class glutathione transferases (rCsGSTo1 and rCsGSTo2) against human small liver-fluke C. sinensis and Opisthorchis viverrini infections. METHODS: Specific antibody levels against rCsGSTo1 and rCsGSTo2 in patients' sera of egg-positive opisthorchiasis (n = 87) and clonorchiasis (n = 120), as well as those in sera from patients with other helminthic infections (n = 252) and healthy controls (n = 40) were retrospectively analysed by ELISA. RESULTS: We observed highly positive correlation coefficients between specific antibody levels against rCsGSTo1 and rCsGSTo2 and egg counts per gramme of faeces (EPG) of patients with opisthorchiasis (n = 87; r = 0.88 for rCsGSTo1 and r = 0.90 for rCsGSTo2). Sera from opisthorchiasis patients whose EPG counts >100 (n = 43) revealed high antibody titres against both antigens. Patients' sera with low EPG counts (<100, n = 44) also exhibited reliable sensitivities of 93.2% and 97.7% for rCsGSTo1 and rCsGSTo2, respectively. Sera from clonorchiasis patients showed sensitivities of 90% (108/120 samples) and 89.2% (107/120 sera) for rCsGSTo1 and rCsGSTo2. Overall diagnostic sensitivities for liver-fluke infections were 92.3% for rCsGSTo1 (191/207 samples) and 93.2% for rCsGSTo2 (193/207 samples). Specificities were 89.7% (rCsGSTo1) and 97.6% (rCsGSTo2). CONCLUSIONS: Detection of specific antibody levels against rCsGSTo1 or rCsGSTo2 might be promising for the serodiagnosis of patients infected with these two phylogenetically close carcinogenic liver-flukes.
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