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Updated: Jul 22, 2026
A Multi-detection Assay for Malaria Transmitting Mosquitoes
Published on: February 28, 2015
OPD (Online Plasmodium Diagnosis): An ALA-PpIX based functional assay to predict active malaria
Shoaib Ashraf1, Jeffrey Agyapong2, Petra Rohrbach2
1Wellman Center for Photomedicine, Massachusetts General Hospital and Harvard Medical School, 40 Blossom Street, Boston, MA 02114 USA.
Background:
Malaria kills one child every 30 seconds reaching up to 3000 children a day. The mosquito borne malarial parasite invades the blood stream and hijacks red blood cells (RBCs). One of the medical successes of the 20th century was development of malaria diagnostic tests. However, poor specificity and sensitivity along with the inability of these assays to distinguish active malarial infections has put the management scheme in jeopardy.
Aim:
To develop an in-vitro functional assay to predict active malarial infections.
Methods:
Plasmodium falciparum (3D7) parasites were incubated with delta-aminolevulinic acid (ALA) for 7 h and imaged using a confocal microscope for protoporphyrin IX (PpIX) fluorescence. Similarly, PpIX was extracted, and fluorescence was estimated by fluorimetry.
Results:
Imaging showed that the falciparum-infected RBCs fluoresced while the non-infected cells did not. Moreover, fluorimetry showed fluorescent peaks only in actively infected RBCs.
Conclusions:
ALA was only taken up by infected RBCs. When the parasites were loaded with ALA, they fluoresced. These proof-of-concept results demonstrate the first functional assay to detect/diagnose active malaria.
