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- Title
Comparative assessment of immunochromatographic test kits using somatic antigens from adult Opisthorchis viverrini and IgG and IgG4 conjugates for serodiagnosis of human opisthorchiasis.
- Authors
Phupiewkham, Weeraya; Sadaow, Lakkhana; Sanpool, Oranuch; Rodpai, Rutchanee; Yamasaki, Hiroshi; Ittiprasert, Wannaporn; Mann, Victoria H.; Brindley, Paul J.; Maleewong, Wanchai; Intapan, Pewpan M.
- Abstract
Chronic infections of humans with Opisthorchis viverrini and Clonorchis sinensis spanning decades may lead to life-threatening pathology prior to cholangiocarcinoma (CCA), which usually has a poor prognosis. Serological tools can support the parasitological examination in clinical diagnosis and support screening for risk of CCA. We developed novel immunochromatographic test kits using a soluble, somatic tissue extract of adult O. viverrini worms as an antigen and colloidal gold-labeled conjugates of IgG and IgG4 antibodies, and evaluated the diagnostic values of both the OvSO-IgG and OvSO-IgG4 kits. For diagnosis of human opisthorchiasis individually, the diagnostic sensitivity, specificity, and positive and negative predictive values with 95% confidence intervals in the OvSO-IgG kit were 86.6% (78.9–92.3), 89.5% (84.2–93.5), 82.9% (74.8–89.2), and 91.9% (87.0–95.4), respectively, while the 75% (65.9–82.7), 98.4% (95.5–99.7), 96.6% (90.3–99.3), and 87% (81.7–91.2), respectively, for the OvSO-IgG4 kit at the prevalence of infection of 37.1%. Twenty-three (76.7%) and 14 (46.7%) of 30 clonorchiasis sera showed positive reactivity with the OvSO-IgG and OvSO-IgG4 kits, respectively. There was 84.1% (κ-value = 0.649) concordance between the two kits, which was statistically significant (p < 0.001). Both ICT kits can be employed as quick and easy point-of-care diagnostic tools, and hence, the OvSO-IgG and OvSO-IgG4 kits can support expanded capacity for clinical diagnosis of human opisthorchiasis and clonorchiasis. These kits may find utility in large-scale surveys in endemic areas where there are limited sophisticated medical facilities or capacity.
- Subjects
OPISTHORCHIS viverrini; ADULTS; SERODIAGNOSIS; HEALTH facilities; ANTIGENS; IMMUNOGLOBULINS; IMMUNOGLOBULIN G
- Publication
Parasitology Research, 2021, Vol 120, Issue 8, p2839
- ISSN
0932-0113
- Publication type
Article
- DOI
10.1007/s00436-021-07224-6