Molecular Diagnostics of Malaria Infections

Molecular diagnostics have transformed the detection and characterisation of Plasmodium infections, overcoming the limited sensitivity of microscopy and rapid antigen tests. By targeting parasite nucleic acids, these methods reliably detect low-density and asymptomatic infections that sustain transmission in pre-elimination settings. Techniques such as polymerase chain reaction (PCR), loop-mediated isothermal amplification (LAMP) and droplet digital PCR (ddPCR) combine high analytical sensitivity with growing portability and throughput. Advances in sample preparation—ranging from dried blood spots to direct-on-blood assays—and integration with lateral-flow or fluorescence readouts are expanding access in both reference laboratories and peripheral health centres. This breadth of approaches supports large-scale screening, real-time surveillance and precise quantification of parasite burden, all of which are essential for tailoring treatment strategies and interrupting transmission chains worldwide.

Research from Nature Portfolio

Implementation of a multiplex real-time PCR assay, validated to international standards, has demonstrated 100% sensitivity and specificity for all five human Plasmodium species, with limits of detection as low as 0.25 parasites/µl for Plasmodium vivax. This quantitative format facilitates high-throughput screening of whole blood and dried blood spots in low-transmission areas. In parallel, droplet digital PCR has provided absolute quantification of parasite density without reliance on external calibration curves, yielding highly reproducible measurements across clinical and asymptomatic samples and showing superior sensitivity over conventional qPCR for Plasmodium falciparum. Earlier work on a commercial LAMP platform has evaluated lyophilised reagents and simplified sample preparation methods under field conditions, achieving limits of detection below 2 parasites/µl and demonstrating reliable performance in remote laboratories. Collectively, these studies underscore the maturity of molecular tools for both high-volume surveillance and decentralised diagnosis.

Molecular Diagnostics of Malaria Infections publication trend

The graph below shows the total number of articles in molecular diagnostics of malaria infections across all publications each year (not limited to Nature Index journals).

Technical terms

Polymerase Chain Reaction (PCR): Enzymatic amplification of specific DNA sequences to detect low-abundance targets.

Real-time PCR (qPCR): PCR method that quantifies DNA during amplification via fluorescence measurement.

Loop-mediated Isothermal Amplification (LAMP): Nucleic acid amplification at a constant temperature using strand-displacing polymerase and multiple primers.

Droplet Digital PCR (ddPCR): Partitioned PCR enabling absolute quantification by counting positive partitions without calibration curves.

Dried Blood Spots (DBS): Filter paper samples allowing stable storage and transport of blood for nucleic acid assays.

Nucleic Acid Lateral-Flow Immunoassay (NALFIA): Rapid strip-based readout that detects amplified DNA via labelled probes on a lateral-flow membrane.

Multiplex Assay: Simultaneous amplification and detection of multiple genetic targets in a single reaction.

References

1. Performance of the procedure for ultra-rapid extraction and loop-mediated isothermal amplification (PURE-LAMP) method to detect malaria in Haiti. Infectious Diseases of Poverty (2023).
2. Molecular detection of human Plasmodium species using a multiplex real time PCR. Scientific Reports (2023).
3. Sensitive Detection of Asymptomatic and Symptomatic Malaria with Seven Novel Parasite-Specific LAMP Assays and Translation for Use at Point-of-Care. Microbiology Spectrum (2023).
4. Laboratory evaluation of the miniature direct-on-blood PCR nucleic acid lateral flow immunoassay (mini-dbPCR-NALFIA), a simplified molecular diagnostic test for Plasmodium. Malaria Journal (2023).
5. Evaluation of the Illumigene Malaria LAMP: A Robust Molecular Diagnostic Tool for Malaria Parasites. Scientific Reports (2016).
6. Sensitive and accurate quantification of human malaria parasites using droplet digital PCR (ddPCR). Scientific Reports (2016).