Diagnosis of Malaria by Detection of Plasmodium Falciparum HRP-2 Antigen With a Rapid Dipstick Antigen-Capture Assay

Lancet. 1994 Mar 5;343(8897):564-8. doi: 10.1016/s0140-6736(94)91520-2.

Abstract

Two field studies in Kenya and an experimental challenge study in the USA were done to assess the accuracy of a dipstick antigen-capture assay based on qualitative detection of Plasmodium falciparum histidine-rich protein 2 (PfHRP-2) in peripheral blood for diagnosis of P falciparum infection. In these studies, the assay was 96.5-100% sensitive for detection of greater than 60 P falciparum asexual parasites/microL blood, 70-81% sensitive for 11-60 parasites/microL blood, and 11-67% sensitive for 10 parasites or less/microL blood. Specificity was 95% (95% CI 85-105%; n = 20) among naive American volunteers, 98% (96-101%; n = 112) among volunteers exposed to the bite of P falciparum-infected mosquitoes, and 88% (84-92%; n = 285) among Kenyans living in an area with holoendemic malaria. Our results also indicated that PfHRP-2 antigen was not detectable in blood 6 days after initiation of curative chemotherapy, and suggest that such circulating antigens rarely lead to false-positive tests. The dipstick assay's sensitivity, specificity, simplicity, and speed may make it an important tool in the battle against malaria.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adolescent
  • Adult
  • Animals
  • Antigens, Protozoan / blood*
  • Child
  • Female
  • Humans
  • Malaria, Falciparum / diagnosis*
  • Malaria, Falciparum / immunology
  • Male
  • Plasmodium falciparum / immunology*
  • Predictive Value of Tests
  • Protozoan Proteins / blood*
  • Reagent Strips
  • Sensitivity and Specificity

Substances

  • Antigens, Protozoan
  • Protozoan Proteins
  • Reagent Strips