Publications, Science and Technology

A novel luciferase-linked antibody capture assay (LACA) for the diagnosis of Toxoplasma gondii infection in chickens

Ngày đăng: by Khoa Thú y

Abstract

Toxoplasma gondii is an obligate intracellular protozoan parasite that causes the most common parasitic zoonosis worldwide in multiples species of mammals and birds. Although free-range chickens may play a role as an important reservoir for T. gondii, there is no reliable and commercially available diagnostic test for this disease in chickens. In this study, we aimed to develop a novel Luciferase-linked Antibody Capture Assay (LACA) for the serodiagnosis of Toxoplasma infection in chickens. Recombinant nanoluciferase fused-T. gondii dense granule antigen 8 (rNluc-GRA8) was produced and applied to LACA assay as a diagnostic antigen. GRA8-LACA was tested with the sera from uninfected and experimentally infected chickens with T. gondii and other parasitic pathogens and showed unexpectedly high sensitivity (90.5%) and specificity (95.4%). Interestingly, E. coli lysate expressing rNluc-GRA8 could be applied in GRA8-LACA with 85.7% sensitivity and an increased specificity (96.9%) that gave better diagnostic performance compared to conventional ELISA. We applied our diagnostic system to examine 267 free-range chicken sera collected from 12 farms and 100 closed-house broiler chicken sera from local poultry abattoirs. The overall seroprevalence of toxoplasmosis in free-range chickens was 10.9% (95% CI: 10.6%-11.1%), while no positive case was found in broiler chickens. GRA8-LACA could be a useful diagnostic technique for T. gondii infection in chickens. The detection of T. gondii seropositive chickens in this study warns a potential risk of Toxoplasma transmission by the consumption of raw or undercooked chicken meat.
Keywords: Chickens; GRA8; Luciferase-linked antibody capture assay (LACA); Nanoluciferase; Toxoplasma gondii. LINK

Hieu Duc Duong

FVM- Vietnam National University of Agriculture

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