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False-positive reactions in the serological diagnosis of schistosomiasis
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Serological tests for schistosomiasis may yield false positives. Researchers found half of children in a non-endemic area had positive results, likely due to avian schistosomes, not human schistosomiasis.
Area of Science:
- Medical Parasitology
- Immunodiagnostics
- Public Health
Background:
- Schistosomiasis diagnosis often relies on serological tests.
- Accurate diagnosis is crucial for effective treatment and public health strategies.
- Non-specific antibody reactions can complicate serological interpretations.
Purpose of the Study:
- To investigate the reliability of serological tests for schistosomiasis in a non-endemic area.
- To identify potential sources of false-positive serological reactions in children.
- To inform clinical practice regarding schistosomiasis diagnosis.
Main Methods:
- Examination of stool and urine samples for parasite ova.
- Performance of indirect fluorescent antibody test (IFAT) on sera.
- Study population: children from a Western Transvaal area with no endemic human schistosomiasis.
Main Results:
- No schistosome ova were detected in any child's excreta.
- Approximately 50% of the children exhibited a positive serological reaction via IFAT.
- Positive reactions suggest infection with Schistosoma mattheei or avian schistosomes, not endemic human schistosomiasis.
Conclusions:
- Serological tests for schistosomiasis can produce false-positive results.
- Prevalence of non-human schistosome infections (e.g., avian schistosomes) can lead to inaccurate diagnoses.
- General practitioners should exercise caution and not solely rely on serological tests for schistosomiasis diagnosis.
Abstract:
Stool and urine samples from children living in an area in the Western Transvaal in which human schistosomiasis was not endemic were examined for parasites and the indirect fluorescent antibody test was performed on their sera. Since none of these children passed any schistosome ova in their excreta but approximately half of them had a positive serological reaction they must have been infected with either Schistosoma mattheei, which is common in snails and cattle in the area, or avian schistosomes. In view of the occurrence of such 'false-positive' results, general practitioners are advised not to rely too heavily on serological tests in the diagnosis of schistosomiasis.