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Related Experiment Videos

Immunodiffusion test for diagnosing basidiobolomycosis.

P Imwidthaya1, S Srimuang

  • 1Department of Microbiology, Siriraj Hospital, Mahidol University, Bangkok, Thailand.

Mycopathologia
|June 1, 1992
PubMed
Summary

A new immunodiffusion test accurately diagnoses basidiobolomycosis using Basidiobolus ranarum culture filtrate antigen. This sensitive and specific test can monitor patient recovery from this fungal infection.

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Area of Science:

  • Medical Mycology
  • Immunodiagnostics
  • Infectious Diseases

Background:

  • Basidiobolomycosis is a fungal infection requiring reliable diagnostic methods.
  • Current diagnostic approaches for basidiobolomycosis can be limited.
  • Identifying specific antigens for Basidiobolus ranarum is crucial for diagnostic development.

Purpose of the Study:

  • To develop and evaluate an immunodiffusion test for diagnosing basidiobolomycosis.
  • To characterize the antigens of Basidiobolus ranarum involved in the immune response.
  • To assess the specificity and sensitivity of the developed diagnostic test.

Main Methods:

  • Development of an immunodiffusion test using culture filtrate antigen (CFA) from Basidiobolus ranarum.
  • Reaction of CFA with human and rabbit antisera to detect precipitin bands.
  • Absorption studies using antisera against related fungi (Conidiobolus coronatus, Pythium insidiosum) to identify shared antigens.
  • Heat stability tests of the antigens.
  • Testing the CFA against sera from various patient groups and healthy individuals.

Main Results:

  • The immunodiffusion test revealed two precipitin bands (inner N and outer Y) with human and rabbit antisera against B. ranarum.
  • A shared antigen was identified between B. ranarum, Conidiobolus coronatus, and Pythium insidiosum, corresponding to the inner band (N).
  • The antigens were heat-stable, and antibody titers correlated with disease activity, decreasing as lesions subsided.
  • The test showed no cross-reactivity with sera from patients with other fungal infections or normal individuals.

Conclusions:

  • The developed immunodiffusion test is practical, sensitive, and specific for diagnosing basidiobolomycosis.
  • The test can differentiate B. ranarum infections from other mycoses.
  • This assay provides a valuable tool for monitoring patients with Basidiobolus ranarum infections.

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