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Determining Soil-transmitted Helminth Infection Status and Physical Fitness of School-aged Children
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Molecular Diagnostics for Soil-Transmitted Helminths.

Elise M O'Connell1, Thomas B Nutman1

  • 1Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland.

The American Journal of Tropical Medicine and Hygiene
|August 3, 2016
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Quantitative polymerase chain reaction (qPCR) offers a more sensitive and specific method for diagnosing soil-transmitted helminths (STHs) compared to traditional microscopy. Standardized molecular diagnostics are proposed for routine use in clinical and field settings.

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Area of Science:

  • Parasitology
  • Molecular Diagnostics
  • Infectious Disease Epidemiology

Background:

  • Traditional diagnosis of soil-transmitted helminths (STHs) relies on microscopy, which often lacks sensitivity.
  • Molecular diagnostic tools, such as quantitative polymerase chain reaction (qPCR), are emerging for pathogen detection.
  • Currently, no regulatory-approved qPCR tests are available for STH diagnosis.

Purpose of the Study:

  • To review and compare the sensitivity and specificity of qPCR versus microscopy for STH diagnosis.
  • To discuss the advantages and disadvantages of employing qPCR for STH detection.
  • To propose guidelines for future qPCR studies and advocate for standardized molecular diagnostics.

Main Methods:

  • Comparative analysis of existing studies evaluating qPCR and microscopy for STH detection.
  • Discussion of the limitations, including the lack of a definitive gold standard for comparison.
  • Synthesis of findings to propose best practices and recommendations.

Main Results:

  • Studies indicate that qPCR demonstrates significantly higher sensitivity and specificity compared to traditional microscopic techniques for STH diagnosis.
  • Despite limitations in current comparative studies, qPCR shows a clear diagnostic advantage.
  • qPCR offers a more accurate detection of intestinal pathogens like *Strongyloides stercoralis*, *Trichuris trichiura*, *Ancylostoma duodenale*, *Necator americanus*, and *Ascaris lumbricoides*.

Conclusions:

  • qPCR represents a substantial advancement over microscopy for diagnosing STH infections.
  • Standardization of molecular diagnostic methods is crucial for reliable clinical and field applications.
  • Implementing routine qPCR testing can improve public health surveillance and patient management for STHs.