Circulating antigens for assessing cure in schistosomiasis mansoni

Area of Science:

• Immunology
• Parasitology
• Medical Diagnostics

Background:

• Schistosomiasis is a significant parasitic disease caused by Schistosoma mansoni.
• Accurate diagnostic tools are crucial for managing schistosomiasis.
• Current diagnostic methods may have limitations in sensitivity or specificity.

Purpose of the Study:

• To develop and evaluate a novel antigen capture enzyme-linked immunosorbent assay (ELISA) for diagnosing schistosomiasis.
• To assess the assay's ability to detect circulating antigens in infected individuals.
• To determine the utility of the assay in monitoring treatment response.

Main Methods:

• Development of an antigen capture ELISA utilizing antibodies against adult Schistosoma mansoni extract antigens.
• Evaluation of the assay's performance using sera from patients with S. mansoni infections, normal subjects, and patients with other parasitic infections.
• Retesting of positive cases after treatment to assess changes in antigen levels.

Main Results:

• The developed ELISA detected circulating antigen in 25 out of 42 patients with S. mansoni infections.
• No reactivity was observed in sera from 45 normal subjects or patients with other parasitic infections, indicating high specificity.
• Following treatment, 21 cured patients became negative, while 4 with persistent infections remained positive.
• Antibodies to a fractionated egg antigen (CEF6) decreased post-treatment but were insufficient for predicting cure.

Conclusions:

• The developed antigen capture ELISA is a promising diagnostic tool for schistosomiasis.
• The assay demonstrates high sensitivity and specificity for detecting active Schistosoma mansoni infections.
• Circulating antigen levels detected by this assay can serve as a reliable indicator of treatment efficacy.