- Open Access
Malaria and the ‘last’ parasite: how can technology help?
© The Author(s) 2018
- Received: 2 March 2018
- Accepted: 3 July 2018
- Published: 11 July 2018
Malaria, together with HIV/AIDS, tuberculosis and hepatitis are the four most deadly infectious diseases globally. Progress in eliminating malaria has saved millions of lives, but also creates new challenges in detecting the ‘last parasite’. Effective and accurate detection of malaria infections, both in symptomatic and asymptomatic individuals are needed. In this review, the current progress in developing new diagnostic tools to fight malaria is presented. An ideal rapid test for malaria elimination is envisioned with examples to demonstrate how innovative technologies can assist the global defeat against this disease. Diagnostic gaps where technology can bring an impact to the elimination campaign for malaria are identified. Finally, how a combination of microfluidic-based technologies and smartphone-based read-outs could potentially represent the next generation of rapid diagnostic tests is discussed.
- Rapid diagnostic tests
The first record of malaria fevers dates back to the 5th century BC . Today, malaria remains one of the four most life-threatening infectious diseases worldwide, together with tuberculosis, HIV/AIDS and hepatitis . Latest data published by the World Health Organization (WHO) are staggering: more than 216 million cases in 91 countries and more than 400,000 deaths occurred globally in 2016 . These figures are the same as in 2015, indicating that despite the unprecedented efforts in recent years, progress has stalled. This calls for more effective tools to reduce malaria and finally to eliminate this scourge. If this historical milestone can be accomplished, it could save the global economies $2 trillion by 2040 .
This review only focuses on relevant innovative diagnostic technologies for malaria elimination settings where the malaria transmission is low; therefore, there is a critical need to detect asymptomatic individuals. Together with other effective interventions, ultra-sensitive rapid diagnostic tests are much needed to identify the invisible reservoirs. The role of innovative tools becomes crucial in the fight against malaria and the WHO identifies three strategic pillars (universal access to prevention, drugs and diagnosis, elimination and surveillance), of which accurate and effective diagnostics at the point-of-care (POC) is the first step towards appropriate diagnosis and treatment for malaria infection [5, 6].
Characteristics of current malaria diagnostic tools used in case management and surveillance
LoD (p/µL or ng mL−1)
Sensitivity (%) (95% CI)
Specificity (%) (95% CI)
Expert: 4–20 
Depends on microscopist
60 min 
Trained personnel, microscope, Giemsa stain 
Average: 50–200 
Existing RDTs: 100 p/µL 
Latest product: 80 pg/mL for PfHRP2 
> 85% depending on species 
> 99% 
No need for expensive instrument
20 min 
Test kit, appropriate storage conditions 
Latest product: 80 pg/mL for PfHRP2 
> 85% depending on species 
> 99% 
No need for expensive instrument
20 min 
Test kit, appropriate storage conditions 
26 (real-time) 
> 99% 
Real-time instrument > 20,000 
Standard > 6 h
Thermocycler, cold chain, power, reagent grade, water
− 0.5 to 5. 0 
47 (real-time) 
> 99% 
Conventional PCR and LAMP ~ 5000 
Heat source for amplification and DNA extraction
≥ 1 
> 85% 
Microscopy is the reference standard for visualization of parasites in blood smears with an analytical sensitivity under normal circumstances approximately tenfold inferior than that of molecular testing . Microscope has been commonly used as a diagnostic tool in peripheral health centres for various reasons, including availability . However, the quality of such diagnosis depends on the availability and skills of trained microscopists, which might not always be available in the LRS, where malaria is endemic.
Advantages and disadvantages of current malaria RDTs
Easy to use
Deletion of the Pfhrp2 gene leads to false negative RDTs (particularly in populations in the Amazon region)
Lack of adequate sensitivity for detection of infection in asymptomatic individuals and/or prozone effect
Quick result delivery time (< 20 min)
Lack of heat stability when being stored in endemic settings
Portable and disposable
Inability to differentiate non-Pf malaria
Require minimal laboratory infrastructure, power or external equipment
Inability to distinguish current and past infections
Inability to quantify parasite density, especially for assessing severity of illness or monitoring treatment efficacy
Although using the same technology of lateral flow immunoassays, the performance of malaria RDTs varies greatly from brand-to-brand, and lot-to-lot, especially with specimens having low parasite density (< 200 parasites/μL). In a collaboration between the Foundation for Innovative New Diagnostics (FIND), the WHO and the Centers for Disease Control and Prevention, 293 malaria RDTs were evaluated from 2008 to 2016 . Most of the evaluated malaria RDTs detect P. falciparum histidine-rich protein 2 (PfHRP2) or P. falciparum lactase dehydrogenase (PfpLDH). In the last round of evaluation, anomalies that interfered with result interpretation were also recorded . The most common anomalies were incomplete clearing and red background, which were observed in 48 and 24% of products. The second most common anomalies were failed migration of liquid, incomplete migration and patchy broken test lines, which occurred in 15, 11 and 11% of the products, respectively.
The performance of lateral flow-based RDTs depends on two main factors: the sensitivity and specificity of antibody-antigen combinations, and the ability to facilitate reliable liquid migration on the nitrocellulose membrane. Much research has focused on new biomarker discovery [32–34], and only limited attention has been paid to reduce limitations imposed by the inhomogeneous migration of liquid across porous nitrocellulose membranes .
Specifications of recently-entered market* technologies for malaria diagnosis.
table based on information contained in Ref 
Type of detection
Cost per test
Cost per instrument
Result display and storage
Sight Diagnostics Ltd, 2014
Automated microscopy suitable for processing of multiple malaria
Fio Corporation, 2012
Universal RDT reader and cloud information services to improve malaria RDT quality assurance and malaria surveillance
Combination of mobile diagnostics (mobile universal reader) with cloud information services
Automated and customising reports
Sensitivity and specificity are functions of the RDTs being read
RDTs processing time is dependent on manufacturer’s recommendation
Data upload within minutes
Daily quality control needed
Depending on RDTs’ manufacturers
Subject to RDTs manufacturers’ recommendations
Similar to pre-paid cellphone plans
Basic 1 day training needed
On screen and web portal
Fyodor Biotechnologies, 2015
A senstitive and specific lateral flow assay detecting novel Plasmodium proteins shed in the urine of febril malaria patients
Dipstick technology (lateral flow assay)
LOD 125 parasites/µL
~ 20 min
100 µL urine
Usable by lay people
Holomic Rapid Diagnostic Reader
Holomic LLC, 2013
Universal RDT reader attachment for smartphones and software to read RDTs and transmit result to a secure cloud information service
Portable, smartphone-based lateral flow immunoassay reader
Quantitative and qualitative
RDTs processing time is dependent on manufacturer’s recommendation
Data upload within seconds
Depending on RDTs’ manufacturers
Subject to RDTs manufacturers’
Basic < 0.5 day training needed
User interface of the smartphones application
Class I medical device
Nucleic acid detection
LAMP Malaria Diagnostic Kit
Eiken Chemical Ltd and FIND, 2012
Commercial LAMP test kit containing primers and reagents needed to run assays using benchtop laboratory equipment
Isothermal DNA amplification
Fluorescence of visual detection
For pan-LAMP: 97.0% sensitivity
For Pf-LAMP: 93.3% sensitivity
30–60 µL blood
Stable for 12 months at < 30 °C
Electricity (batter-powered possible)
4 days of training required
Turbidimeter and software
Positive and negative controls included
An automated and compact LAMP technology to qualitatively detect Plasmodium spp. DNA in human whole blood samples
Isothermal DNA amplification
< 50 min
Human whole blood
Stable for 12 months at 2–30 °C
Does not require specialised laboratory equipment
Tulip Group and Bigtec Labs, 2013
POC real-time quantitative PCR instrument
Fluorescent probe-based real-time PCR
> 99% sensitivity and specificity
LOD 2 parasites/µL blood
100 µL blood
1–2 days training required
5000 test results can be stored internally, cloud information available
A quantitative micro PCR platform containing all equipment and reagents needed for point-of-care applications
Using the proprietary magnetic nanoparticles to capture DNA
< 60 min
A customised micro printer is available
Another example utilizes a portable breath analyzer: breaths of malaria-infected patients were found to contain terpenes, a family of aromatic chemicals that are produced by parasites that can further attract mosquitoes [59, 60]. A pilot study in Malawi confirmed that these aromatic compounds could be transported into the lungs and hence could be detected in the exhalation of infected patients .
Despite being unquestionably novel, these abovementioned methods of detection still need to prove their practicality for POC in LRS and demonstrate a clinically relevant limit of detection (LOD). For instance, in the breath analyzer, it would be useful to be able to convert the level of terpenes detected in breath into parasite density.
Different settings require different target product profiles (TPP) . Unlike previous malaria control campaigns, the key characteristics of malaria elimination efforts are to interrupt endemic transmission and to prevent its re-establishment . The Program for Appropriate Technology in Health (known as PATH) and FIND are pioneering the development and validation of sensitive rapid tests for mass screening in LRS. They also proposed a TPP for malaria RDTs in elimination settings, stating specific requirements for the ideal rapid tests according to concept of Affordable, Sensitive, Specific, User-friendly, Equipment-free and Deliverable (ASSURED) . The desired LOD is 5 parasites/µL or less, or concentration range of 6–12 ng/mL PfHRP2 . For RDT developers it is important to note the caveat of the prozone phenomenon that might prevent detection of high parasite density . Poor specificity could lead to over-treatment, thus depreciation of the intended value of RDTs (from public health perspectives); therefore, the required specificity for effective malaria diagnosis is at least 97% or ideally 99% .
Additional requirements for ideal RDTs are suitability and appropriateness for LRS where most malaria cases occur. To make an impact simplicity and affordability are of utmost importance. Simplicity means, the system should be equipment-free and should require very little resources . A simple and automated test could obviate false results caused by user-errors . Affordability is difficult to measure and depends on the cost–benefit equation of a specific situation. Also, tests should be designed to minimize impact of inappropriate storage conditions (2–40 °C) on reagent stability and usability of the devices .
Performance of proof-of-concept platforms based on microfluidics for malaria detection
Limit of detection
Continuous flow PCR
< 1 p/µL
Cell deformation mechanism
P. falciparum iRBCs
Non-inertial lift effect
P. falciparum ring stage iRBCs
Enrichment factor of 4.3
Throughput 12,000 cells/h
Electrical conductivity of iRBCs is significantly higher than healthy RBCs
P. falciparum ring stage
Optofluidic-flow analyser that can measure the optical absorption of RBCs in P. falciparum infected blood sample
2.96% parasite density
Naked-eye screening of in-meso detection of hemozoin crystallites based on birefringence
Hemozoin crystals produced by P. falciparum
~ 12 min
Visual detection of colored assay spot on a disposable microfluidic card based on a flow-through membrane immunoassay
Paper-based catridge containing detection areas for both thin and thick smears
Cell enrichment microfluidics combined with magnetic relaxometry detection
P. falciparum ring stage parasites
5% parasite density
Detection of hemozoin in iRBCs by magnetic resonance relaxometry
Hemozoin in iRBCs in P. falciparum infections
< 10 p/µL
Low antigen concentration is a common problem in diagnostic immunoassays and malaria antigen detection is not an exception. To overcome this challenge, several prototypes of analyte concentrator have been developed to enrich biomarkers hence improve LOD. To illustrate how analyte enrichment prior to analysis can improve sensitivity of ELISA, Cheow et al. reported a prototype that can enhance the LOD of prostate-specific-antigen assay up to 1.85 pg/mL . The significant enhancement of 100-fold was achieved by trapping the charged fluorescent product of standard ELISA (analyte-bound enzyme complex) using a multiplex electrokinetic preconcentration technique without modifying the immunobinding process.
Blood is the most common type of specimen for POC testing. However, the cellular components in whole blood often cause non-specific background. To address this problem, a continuous microfluidic device was developed to filter the cells, making plasma available for on-chip analysis .
Healthy and P. falciparum-infected red blood cells exhibit different ionic permeability of their plasma membrane, with infected cells being more permeable. Therefore, when healthy and infected cells are suspended in a low conductivity medium, infected cells lose internal ions and acquire a different dielectrophoretic mobility than healthy ones . Several groups have developed microfluidic chips using dielectrophoresis and variants of it to separate cells successfully leading to promising prototypes for detecting infected red blood cells thus malaria infections [101–103].
Controlling flow on microfabricated devices often introduces a great degree of complexity. For example, a combination of screws, pneumatic and solenoid valves was integrated into a microfluidic platform to actuate flow and control chemical gradients in microchannels . This design might be suitable for laboratory-based tests, but may not lead to robust systems for LRS. Nonetheless, the uses of centrifugation and capillary forces to transport liquids are excellent examples of stand-alone systems [105, 106]. Extensive reviews discussing how to engineer flow path in microscale using capillary and centrifugal forces for POC applications exist [69, 107]. Libraries of microfluidic elements such as valves, mixers and pumps have also been developed [77, 108, 109].
Sensitive detection remains one of the biggest hurdles for clinical diagnosis at the onset of infection. The bottleneck is the limited amount of detectable analytes in a very limited volume of sample. One strategy is to amplify the signal, then convert it into quantitative measurements such as electrical and/or optical signals . The detection strategy is therefore critical for the overall design and fabrication of a device. Optical detection is considered as the ideal read-out for POC applications of microfluidics owing to the simple design and potentially low cost [110, 111]. There are five main categories of optical detection based on the type of generated optical signals: fluorescence, luminescence, absorbance, surface plasmon resonance, and surface-enhanced Raman scattering [112–116]. Detailed discussions about detection strategies for microfluidics systems also exist in the literature .
At the moment, PCR and LAMP are the most sensitive technique for identification of asymptomatic individuals, for example, in 130 clinical samples presenting no parasites based on microscopy, as low as 3.6 × 10−4 parasite/μL could be identified in 117 samples by a highly sensitive genus-specific quantitative reverse transcriptase real-time PCR (qPCR) . This low LOD was achieved by amplifying and detecting the total nucleic acids of the 18S rRNA genes, which increased the analytical sensitivity of the assay by more than 1 log unit compared to DNA only. However, current applications of PCR and LAMP are still restricted to well-equipped laboratories and thus not suitable for LRS . Miniaturized PCR and/or LAMP is desirable, but developing such devices is a more challenging task than that for biomarkers detection for three reasons: (1) sample pre-treatment is essential for extracting DNA of parasites for downstream analysis, (2) the critical signal amplification step highly depends on temperature control, and (3) robust, low cost, and portable detection techniques are required for remote settings .
The PCR/LAMP process requires isolation of genetic materials from infected cells, pre-concentration, as well as signal amplification and analysis. All steps need to be integrated seamlessly in a closed process to overcome time consuming laboratory-like processing steps. Earlier studies have demonstrated successful prototypes that could sequentially perform cell isolation and lysis for messenger RNA purification . On this device, a unique valving system was designed to facilitate liquid migration and analysis. Microfluidics with “macrofluidics” can also be combined to precisely reconstitute reagents, and automated filling liquids for multiplex PCR technique. A successful story is the Cepheid GeneXpert instrument, where all steps from sample preparation, nucleic acid extraction, to thermal cycling for amplification and eventually detection can be integrated into one platform . A review of microfluidic-based DNA analysis systems is available here .
The major challenge of miniaturizing bench-top PCR instruments is the requirement of numerous heating cycles for thermal reactions. To overcome this challenge, micromixers and microchambers were designed to allow thermal reactions to take place rapidly . To speed up DNA amplification by improving thermal transfer through interfaces, microfluidic elements, such as mixers, heaters and temperature controlling units were integrated into glass and silicon substrates . Another strategy to enable different heating regions using continuous flow was investigated using a Peltier element to regulate the temperature for thermal cycling . On this platform, as few as to 2 P. falciparum parasites/μL could be detected. This device offered a simplified sample processing step using desiccated hydrogel, reagents and a camera to detect amplicons. When analysing 188 archived, frozen samples collected in Uganda, this prototype achieved 97.4% sensitivity and 93.8% specificity.
One of the most promising development for stand-alone integrated systems for DNA analysis perhaps was an elegant combination of an exothermic reaction with phase change materials to regulate the heat for thermal cycling . In this prototype, downstream processes such as purification and concentration of sample were integrated seamlessly into the same platform.
Recent work reported by Juul et al. challenged the need of thermal cycling for PCR-like systems by proposing an endogenous enzyme activity detection called rolling-circle enhanced enzyme activity to quantify as little as 1 P. falciparum parasite/μL . The principle of this method is based on using rolling-circle-amplification (RCA) technique to convert a circular DNA template into a 103 tandem repeat rolling-circle product. In this system, RCA substrates can be processed by the DNA-cleaving enzyme topoisomerase I from Plasmodium parasites, which produces many DNA circles leading to enhanced signal. RCA products can have sizes reaching micrometers, which enable visualization at single molecular level.
Paper-based microfluidics was proposed by Whitesides and colleagues . Since then, this technology has been growing fast with great promises for global health applications . Unlike its sister products of paper test strips, paper-based microfluidic analytical devices offer well-defined, millimetre-sized microchannels to transport liquids in a controlled manner, yet with low cost for production (< $0.01) . Using hydrophobic “inks” to define areas on hydrophilic paper, it is possible to perform multiple immunodiagnostic assays on the same test strip. To illustrate how complex analytical processes can be simplified and transformed into a paper-based microfluidic device, Pereira et al. integrated concentration and detection steps into a single step assay . The analyte PfpLDH in low abundance was first accumulated using a micellar aqueous two-phase system (ATPS). The micellar ATPS consisted in a nonionic Triton X-114 surfactant, which was used to concentrate biomarkers in a sample and enhance the LOD. In this system, a tenfold improved LOD of 10 ng/μL PfpLDH was achieved. In an alternative development of a foldable, card-like test device, PfHRP2 could be detected and quantified . The generated signal in presence of PfHRP2 was amplified by gold nanoparticles, yielding a LOD of 1.2 ng/mL PfHRP2, which is four times higher than that of the unamplified case. These studies serves as excellent examples for low cost, non-instrumented analysis systems without compromised performance. Many other innovative approaches to control liquid flows such as selective hydrophobic rendering or origami in which folding of multiple paper layers to trigger reactions were also investigated successfully [132–134].
Mobile health applications have rapidly been growing in recent years and there is a trend in interfacing consumer electronics such as smartphones with lateral flow RDTs or microfluidic-based devices [135, 136]. Such combination is expected to deliver increased objectivity of test result interpretation and improved connectivity of the entire healthcare systems. The automation and digitized test results can be more easily combined with other health related parameters and combined with medical decision support systems. User-friendly interfaces, automated result analyses, remote-monitoring and data aggregation, increased storage conditions, and active quality assurance are just a few additional benefits of this approach .
Examples of lab-on-a-phone applications
Phone LED and camera + 4 external lenses and mirrors
Mie scattering simulation online
Immunoagglutination (Mie light scattering)
PfHRP malaria biomarker
1 pg/mL–10 ng/mL
LOD 1 pg/mL
Computational power + external optical fiber + LED
Escherichia coli and Staphylococus aureus
Comparable to that of commercial PCR
HE4 (ovarian cancer biomarker)
89.5% sensitivity, 90% specificity
2 external LEDs + phone camera
< 1 ppm
External LED + phone camera + additional lens
External LED and optical fibers
Immunochromatography (Mie scatter)
Thyroid stimulating hormone
Nitrocellulose test strip
Phone camera + external LED
Human IgG sample
Microfluidics, silver deposition
Snap-on attachment (lens + LEDs) + phone camera
Rapid test diagnostic strips
4 × dilution c.f. RDTs
3 external attachments + lenses + LED + phone camera
600–2500 white cells/image
400–700 red cells/image
External LEDs and photodiode
LOD 10 mg/dL
Snap-on attachments (lens + LED) + phone camera
ImageJ on computer
Prostate specific antigen (PSA)
Dynamic range 0.08–60 ng/mL
LOD 0.4–0.04 ng/mL
A smartphone was used for quantitative reading of the Optimal-IT test, a commercially available malaria RDT with a snap-on unit as reader that is suitable for both Android and iPhone . Images of RDTs were acquired, in either transmission or reflection, and then processed in real time to deliver test results within 10 min. The spatio-temporal information collected by this device can document prevalence of many infectious diseases and would allow efficient tracking of epidemics. Another approach to integrate a custom microfluidic-based immunoassay detecting PfHPR2 with phone-based detection was the development of a microfluidic chip, which can be connected to a phone camera to analyze signals and deliver results in 10 min. The opto-mechanical unit in this case consisted of optical fibers, microfluidic chips and mirrors, and could be easily removed from the back camera of the phone. The principle was to quantify changes in fluorescent intensity upon capturing of PfHPR2 on the sensing region, yielding a LOD of 1 pg/mL of PfHRP2 in 10% diluted blood .
Accurate and consistent blood smear reading is challenging to attain in health centres or small clinics in remote regions. A phone-based microscope is a low cost option that can offers enhanced image quality, improved accuracy and user comfort [146, 150]. There are two simplified imaging techniques suitable for smartphone apps: (1) lens-free holographic imaging, and (2) on-lens devices.
Holography is an image-constructing technique using scattering and interference of light and pixel super-resolution to enhance optical images . An automated lens-less holography was developed with a sufficient field of view of 24 mm2 to visualize and capture images of P. falciparum in blood smears .
Phone-based microscopy can also be engineered to be a field-ready polarized light microscope without compromised fidelity and resolution . The principle was to detect light birefringence caused by the crystallization of haemozoin. This field-based, modular microscope could magnify Plasmodium chabaudi parasites up to 50 times, gaining a comparable performance compared to conventional polarized microscope. Additional benefits of this prototype are simple operations and low cost per test. Further work using clinical samples could confirm the full potential of this novel phone-based polarized light microscope.
Accurate and effective diagnosis is the first step to further pursue efforts to eliminate and reduce the global burden of malaria by 90% in 2030. Current diagnostic methods can detect malaria symptomatic infections, but often miss out asymptomatic cases. The rise in proportion of asymptomatic infections in low transmission areas calls for a new generation of rapid diagnostic tests that can detect the hidden parasite reservoir. Technology is advanced nowadays to (at least theoretically) be able to track down the last parasite carriers. While malaria case management has improved, other causes of fever need to be detected and treated accordingly. Therefore, the ideal RDT should come in as a complete package with ultra-high sensitivity and specificity, meet the ASSURED standards for LRS, and also provide additional diagnostic capabilities. Microfluidic devices coupled to phone-based readouts offer a unique opportunity to not only reduce the burden of infectious diseases, such as malaria, but also could provide tools for monitoring epidemics and elimination progress on very large scales.
NMP drafted the manuscript; NMP and EMD wrote the manuscript with contributions from HPB and WK. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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NMP receives doctoral scholarship funding from the Engineering for Developing Program at ETH Zürich (Sawiris Foundation).
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