4.5 Article

Molecular and Biological Diagnostic Tests for Monitoring Benzimidazole Resistance in Human Soil-Transmitted Helminths

Journal

AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE
Volume 88, Issue 6, Pages 1052-1061

Publisher

AMER SOC TROP MED & HYGIENE
DOI: 10.4269/ajtmh.12-0484

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Funding

  1. Atlanta Research and Education Foundation, Inc.
  2. Centers for Diseases Control and Prevention (CDC)
  3. Quebec Centre for Host Parasite Interactions/FQRNT

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In endemic countries with soil-transmitted helminths mass drug administration with albendazole or mebendazole are being implemented as a control strategy. However, it is well known in veterinary helminths that the use of the same benzimidazole drugs can place selection on the beta-tubulin gene, leading to resistance. Given the concern that resistance could arise in human soil-transmitted helminths, there is an urgent need to develop accurate diagnostic tools for monitoring resistance. In this study, we developed molecular assays to detect putative resistance genetic changes in Ascaris lumbricoides, Trichuris trichiura, and hookworms, and we optimized an egg hatch assay for the canine hookworm Ancylostoma caninum and applied it to Necator americanus. Both assays were tested on field samples. The molecular assays demonstrated their reproducibility and capacity to detect the presence of worms carrying putative resistance-associated genetic changes. However, further investigations are needed to validate our molecular and biological tests on additional field isolates.

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