Immune trypanolysis test with blood spotted on filter paper for epidemiological surveillance of sleeping sickness

Trop Med Int Health. 2014 Jul;19(7):828-31. doi: 10.1111/tmi.12316. Epub 2014 Apr 18.

Abstract

Objectives: The immune trypanolysis test (TL) is an accurate sero-diagnostic tool increasingly implemented for sleeping sickness medical surveillance, but it is restricted to the reference laboratories. To facilitate storage and transport of the test specimen, we developed a protocol for the examination of blood spotted on filter paper (TL-fp) that can be stored and shipped at ambient temperature. We compared its performance with the classical TL on plasma (TL-pl) that needs to be kept frozen until use.

Methods: The study was conducted in active foci of the Republic of Guinea. In total, 438 specimens from treated and untreated sleeping sickness patients and serological suspects were tested with both methods.

Result: TL-fp gave significantly less positive results than TL-pl, but all the confirmed sleeping sickness cases were positive with the TL-fp protocol.

Conclusion: TL-fp appears to offer a good compromise between feasibility and sensitivity to detect currently infected subjects who play a role in the transmission of Trypanosoma brucei gambiense and is useful for contributing to the elimination of gambiense sleeping sickness.

Keywords: Tripanosomiasis Humana Africana; antibody; anticorps; anticuerpos; diagnosis; diagnostic; diagnóstico; filter paper; human African trypanosomiasis; immune trypanolysis test; papel de filtro; papier filtre; prueba de tripanólisis humana; surveillance; test de trypanolyse; trypanosomiase humaine africaine; vigilancia.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies, Protozoan / blood*
  • Guinea / epidemiology
  • Humans
  • Mass Screening / methods
  • Neglected Diseases / epidemiology
  • Population Surveillance / methods*
  • Sensitivity and Specificity
  • Specimen Handling / methods
  • Trypanosoma brucei gambiense / immunology*
  • Trypanosomiasis, African / blood
  • Trypanosomiasis, African / diagnosis
  • Trypanosomiasis, African / epidemiology*

Substances

  • Antibodies, Protozoan