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Related Experiment Videos

A Clonorchis sinensis-specific antigen that detects active human clonorchiasis

S I Kim1

  • 1Department of Parasitology, Chosun University College of Medicine, Kwangju, Korea.

The Korean Journal of Parasitology
|April 8, 1998
PubMed
Summary

A 7 kDa antigen from Clonorchis sinensis excretory-secretory product shows promise as a specific biomarker for active clonorchiasis infection. This antigen effectively distinguishes active cases from past infections and other parasitic diseases.

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Area of Science:

  • Parasitology
  • Immunology
  • Infectious Diseases

Background:

  • Clonorchiasis, caused by *Clonorchis sinensis*, is a significant public health concern in endemic areas.
  • Accurate diagnostic tools are crucial for identifying active infections and differentiating them from past exposure or other helminthic infections.

Purpose of the Study:

  • To evaluate the diagnostic potential of specific antigens in *C. sinensis* excretory-secretory products (CsE) for detecting human clonorchiasis.
  • To determine the specificity and sensitivity of a 7 kDa antigen in distinguishing active *C. sinensis* infections.

Main Methods:

  • Immunoblot analysis was performed using excretory-secretory products from *C. sinensis* (CsE) and sera from patients with clonorchiasis, other parasitic infections, and healthy individuals.
  • The reactivity of 30 kDa and 7 kDa antigens within CsE was assessed against infection and post-treatment sera.

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  • Specificity was further evaluated by testing against sera from patients with *Paragonimus westermani* and *Metagonimus yokogawai* infections.

    • Main Results:

    • Both 30 kDa and 7 kDa antigens reacted strongly with sera from active clonorchiasis patients.
    • The 7 kDa antigen demonstrated high specificity, showing no cross-reactivity with sera from past clonorchiasis, *P. westermani*, or *M. yokogawai* infections.
    • In an endemic area, the 7 kDa antigen detected IgG antibodies in 92% of active clonorchiasis cases and showed minimal cross-reactivity in individuals with other parasitic infections.

    Conclusions:

    • The 7 kDa antigen in CsE is a potential specific biomarker for active *Clonorchis sinensis* infection.
    • This antigen offers reliable specificity in differentiating active clonorchiasis from past infections and co-endemic helminthiasis.
    • Further application of this antigen could improve clonorchiasis diagnosis in endemic regions.