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A serological test for granuloma inguinale.
A L Freinkel1, Y Dangor, H J Koornhof
1Department of Anatomical Pathology, University of the Witwatersrand Medical School, Johannesburg, South Africa.
Genitourinary Medicine
|August 1, 1992
Summary
An indirect immunofluorescence test shows high accuracy for diagnosing granuloma inguinale (GI) when applied to tissue sections. This method is valuable for individual diagnosis and epidemiological studies of GI.
Area of Science:
- Medical Microbiology
- Immunology
- Dermatology
Background:
- Granuloma inguinale, also known as donovanosis, is a chronic bacterial infection.
- Diagnosis often relies on clinical presentation and laboratory confirmation, with limited serological options.
- Calymmatobacterium granulomatis is the causative agent, and culture methods are not always available.
Purpose of the Study:
- To evaluate an indirect immunofluorescence technique for diagnosing granuloma inguinale.
- To assess its utility as a serological test using paraffin-embedded tissue sections.
Main Methods:
- Indirect immunofluorescence assay applied to paraffin-embedded tissue sections of lesions.
- Testing of sera from patients with granuloma inguinale, other genital ulcerations, and blood donors.
- Comparison of unabsorbed sera versus sera absorbed with Klebsiella pneumoniae.
Main Results:
- The test demonstrated high sensitivity (100%) and specificity (98%) at a 1:160 serum dilution.
- Positive predictive value (PPV) was 89%, and negative predictive value (NPV) was 100%.
- Pre-absorption of sera with K. pneumoniae did not improve test performance.
Conclusions:
- Indirect immunofluorescence is a valuable serological tool for diagnosing granuloma inguinale in the absence of culture methods.
- The technique can aid in the diagnosis of individual cases and serve as an epidemiological tool for disease surveillance.