The motivation for the review lies in the well-documented shortcomings of conventional diagnostic approaches. Microscopy, the historical mainstay, requires skilled microscopists, invasive sampling from lesions, bone marrow, lymph nodes or spleen, and it delivers sensitivity that falls sharply with parasite burden and operator experience. Serological tests, meanwhile, detect antibodies rather than the parasite itself, which means they cannot reliably distinguish active infection from past exposure, a critical limitation in endemic regions where a large share of the population may carry immunological memory without current disease. Parasite culture, although specific, is slow, technically demanding and insensitive. Together, these constraints have long argued for a shift toward methods that detect parasite nucleic acids directly, offering both higher analytical sensitivity and the ability to quantify parasite load for monitoring treatment response.

The quantitative core of the review centers on real-time quantitative PCR, or qPCR, targeting kinetoplast DNA. Kinetoplast DNA minicircles are small, circular mitochondrial DNA molecules present in thousands of copies per parasite, a feature that gives kDNA-targeted assays an enormous analytical advantage over single-copy nuclear targets. Pooling data across studies with a bivariate random-effects model, the review found that qPCR targeting kDNA achieved a pooled sensitivity of 95.8 percent, with a 95 percent confidence interval of 92.4 to 98.2 percent, and a pooled specificity of 98.8 percent, with a confidence interval of 96.7 to 99.7 percent. Summary receiver operating characteristic curves were generated using the hierarchical summary receiver operating characteristic model, following Cochrane guidance, and heterogeneity was quantified with the I² statistic. On the strength of these figures, the review positions kDNA-targeted qPCR as the reference standard among molecular approaches, albeit one whose performance comes with substantial infrastructure requirements.

That caveat matters. qPCR demands thermocycling instruments, continuous cold chains for reagents, reliable electricity, trained molecular biologists and quality assurance systems that are often absent precisely where leishmaniasis takes its greatest toll. Rural clinics in East Africa, South Asia and Latin America, where visceral and cutaneous disease overlap with poverty and weak laboratory networks, cannot routinely run quantitative real-time platforms. This is why the review devotes considerable attention to isothermal amplification technologies, which amplify nucleic acids at a constant temperature and therefore eliminate the need for expensive cycling equipment. The most mature of these is loop-mediated isothermal amplification, known as LAMP, which uses a set of four to six primers recognizing six to eight regions of the target sequence and a strand-displacing polymerase to generate amplification products that can be read visually by turbidity, fluorescence or color change.

The pooled performance of LAMP in the review was impressive: a sensitivity of 92.5 percent, with a 95 percent confidence interval of 87.1 to 96.4 percent, and a specificity of 98.9 percent, with a confidence interval of 96.2 to 99.9 percent. Yet the analysis also exposed a cautionary lesson about pooled diagnostic estimates. Heterogeneity among LAMP studies was extremely high, with an I² value of 98.3 percent, meaning that virtually all of the variability in reported accuracy reflected differences between studies rather than sampling variation within them. The review attributes much of this heterogeneity to primer mismatches for Leishmania aethiopica, a species that causes cutaneous disease in parts of East Africa and whose genetic divergence from better-studied species such as Leishmania donovani and Leishmania major can undermine primer binding. The finding underscores a recurring theme in molecular diagnostics: assay performance is not a property of the technology alone but of the fit between primers and the local parasite population.

Even faster than LAMP is recombinase polymerase amplification, or RPA, which operates at body temperature, typically 37 to 42 degrees Celsius, and can produce a result in as little as 15 to 20 minutes. RPA recruits recombinase enzymes to pair primers with their target sequence and a strand-displacing polymerase to extend them, making it uniquely tolerant of crude sample preparation and low-resource settings. In the review, RPA showed strong agreement with qPCR, with a Cohen’s kappa of 0.89, a level of concordance that supports its use as a point-of-care test. For field epidemiology, outbreak investigation and primary care in endemic villages, a test that returns an answer within a single patient visit, without a laboratory, could change the practical epidemiology of the disease, enabling same-day treatment decisions and reducing the losses to follow-up that plague current diagnostic pathways.

Another frontier highlighted by the review is the move away from invasive sampling. Traditional confirmation of visceral leishmaniasis may require splenic or bone marrow aspiration, procedures that carry real risk and require surgical skill. The review found that non-invasive samples, including urine, adhesive tape discs pressed against suspected skin lesions, and skin swabs, achieved a pooled molecular sensitivity of 93.9 percent, with a 95 percent confidence interval of 88.4 to 97.4 percent. Urine in particular has attracted interest because it can be collected repeatedly, safely and by minimally trained personnel, allowing parasite DNA detection and treatment monitoring without any needle. Tape discs and swabs open a similar door for cutaneous and mucocutaneous disease, where biopsy of facial lesions can be disfiguring. If non-invasive molecular sampling can be standardized, it would remove one of the last practical barriers to confirming diagnosis in primary care.

The review does not abandon serology entirely; instead it documents its modernization. Novel peptide-based enzyme-linked immunosorbent assays using the BT7 and EL1 peptides achieved an area under the curve of 0.971, approaching the discrimination of molecular tests while retaining the simplicity and low cost of antibody detection. Separately, a recombinant antigen derived from the Leishmania donovani Aurora kinase protein, designated LdAIRK, showed strong performance as a test of cure, addressing one of the most vexing problems in visceral leishmaniasis management: distinguishing patients who have been cured from those who will relapse or develop post-kala-azar dermal leishmaniasis. Conventional antibody tests remain positive for years after cure, making them useless for follow-up, so an antigen that tracks active infection status could transform post-treatment surveillance, particularly in South Asia where PKDL reservoirs sustain transmission.

The review is candid about what remains missing. Despite the proliferation of targeted amplification assays, next-generation sequencing has not yet been established for direct clinical diagnosis of leishmaniasis, leaving species identification, mixed infections and emerging drug resistance largely dependent on older tools such as restriction fragment length polymorphism analysis and internal transcribed spacer sequencing in reference laboratories. High-resolution melting analysis and miniature direct-on-blood PCR nucleic acid lateral flow immunoassays, abbreviated mini-dbPCR-NALFIA, appear among the innovations catalogued, but cost-effectiveness analyses, which health ministries need to justify procurement, are conspicuously absent from the literature. The review’s conclusion is therefore twofold: molecular methods have genuinely advanced, with qPCR setting the accuracy benchmark and isothermal platforms closing the accessibility gap, but heterogeneity across studies demands standardized protocols, shared primers and validated reference materials before these gains can be translated into routine practice across the 98 countries where the disease persists.

Subject of Research: Recent advances in molecular diagnosis of human leishmaniasis

Article Title: Recent advances in molecular diagnosis of human leishmaniasis

Article References: Asseri, J. I. (2026). Recent advances in molecular diagnosis of human leishmaniasis. BMC Infectious Diseases. https://doi.org/10.1186/s12879-026-14357-5

Image Credits: AI Generated

DOI: 10.1186/s12879-026-14357-5

Keywords: Recent, advances, molecular, diagnosis, human, leishmaniasis, scientific research

The six proposed Metrics for Sustainability offer a framework that moves beyond vague aspirations toward measurable performance. Material circularity captures the proportion of materials that remain in productive use across a lunar settlement, providing a quantitative analogue to recycling rates on Earth but extended to include the recovery of volatiles from waste streams and the repurposing of hardware at end of life. Life-support energy performance reflects the efficiency with which a habitat sustains breathable atmospheres, potable water, and thermal regulation, all of which demand continuous power through the two-week lunar night when solar generation is unavailable. Agricultural output measures the capacity of a settlement to produce food locally, which reduces launch mass from Earth, improves diet freshness for crews, and buffers against supply chain interruption.

Social cohesion as a metric may appear unusual in an engineering context, yet the evidence from isolated, confined, and extreme environments on Earth consistently shows that interpersonal dynamics, governance structures, and habitat design strongly influence mission outcomes. Research into salutogenesis in space emphasises that wellbeing is not merely the absence of illness but the presence of factors that help crews thrive, including a sense of coherence, meaningful work, and environments that support psychological adaptation. The finding that only a small minority of surveyed respondents expressed willingness to live in very small space settlements underscores that perceived habitability and community size matter to real people, and that any long-term lunar presence must be designed with human factors as rigorously as with power systems or landing pads.

Supply chain resilience, the fifth metric, acknowledges that even a mature lunar settlement will remain connected to Earth through the exchange of specialised components, scientific instruments, and personnel. Resilience in this context means the ability to absorb shocks, whether geopolitical conflict disrupts international partnerships, economic downturns curtail budgets, or a launch failure removes a critical logistics node. A settlement that can fabricate more of its own spares through additive manufacturing, maintain buffer stocks of essential consumables, and operate degraded systems safely for extended periods scores higher on this metric than one dependent on just-in-time delivery from Earth.

The final metric, legal and governance frameworks, is perhaps the most consequential and the least technologically deterministic. The Outer Space Treaty of 1967 established foundational principles, including that space is free for exploration and use by all states and that celestial bodies are not subject to national appropriation, but it was written long before the prospect of commercial lunar resource extraction became plausible. Subsequent instruments, national legislation, and multilateral initiatives have begun to address gaps, yet substantial ambiguity remains regarding property rights in extracted resources, standards of environmental protection on the lunar surface, coordination of activities to avoid harmful interference, and mechanisms for dispute resolution. The paper’s argument that the Spacefaring scenario is most desirable partly depends on the existence of agreed norms that allow multiple actors to operate without conflict.

The four scenarios, Red Tape, Run for Resources, Restricted Operations, and Spacefaring, function as a foresight tool that illuminates how different combinations of governance and technical choices lead to divergent futures. In a Run for Resources world, competitive dynamics could produce rapid activity but also duplication, environmental degradation of scientifically valuable sites, and increased risk of accident or confrontation. Restricted Operations, by contrast, might protect the lunar environment through excessive caution while foreclosing the benefits that a sustained presence could deliver, including scientific discovery, economic development, and the demonstration of technologies needed for eventual Mars missions. The Spacefaring scenario emerges as preferable because it couples ambitious activity with cooperative governance and sustainable practice, treating the Moon as a place where humanity learns to live and work off-planet responsibly.

The staged model of lunar presence, moving from robotic reconnaissance through short-termSortie missions to long-term habitation and eventually something akin to a lunar village, provides a useful temporal scaffold for planning sustainability interventions. At the robotic stage, sustainability considerations centre on planetary protection and the avoidance of contamination at sites of scientific interest, such as permanently shadowed regions where water ice records billions of years of solar system history. Short-term missions introduce questions of landing site selection, traffic management, and the cumulative effects of repeated landings on regolith dynamics and the exosphere. Long-term habitation raises the full suite of circular economy challenges, including waste processing, radiation shielding through regolith construction, and the provisioning of agriculture under artificial light.

The lunar night deserves particular emphasis because it dominates the engineering envelope of any permanent presence. Fourteen days of darkness mean that solar power alone cannot sustain life support without substantial storage or complementary generation, and options such as fuel cells, nuclear surface power, and strategically sited solar arrays at peaks of near-eternal light near the poles are all under active investigation. Any sustainability metric on energy performance must therefore account for night survivability, not just daytime efficiency, because a settlement that cannot reliably endure the night cannot claim long-term resilience. The paper’s pragmatic definition of permanence, as continuing operations by successive crews with continuous robotic support where technology cannot yet fully overcome the night, reflects this reality honestly.

In-situ resource utilisation sits at the heart of the technical vision. The lunar poles are believed to host water ice within permanently shadowed craters, a resource that can yield drinking water, breathable oxygen, and, through electrolysis, hydrogen and oxygen propellant. Regolith itself can be sintered or bound into building elements, providing radiation shielding and thermal mass without importing construction material. Oxygen constitutes a large fraction of regolith oxides, and extraction processes ranging from hydrogen reduction to molten regolith electrolysis are being developed at increasing levels of maturity. Extending ISRU toward ISRU-wellbeing, as the paper proposes, is a novel conceptual move: it suggests that local resources should support not only survival but flourishing, informing habitat architecture, lighting design that mimics terrestrial circadian cues, and communal spaces that foster the social cohesion the metrics seek to measure.

The proposal that the metrics could eventually be embedded in legal, governance, and technical agreements between stakeholders mirrors the way terrestrial environmental standards migrate from voluntary frameworks into binding regulation and procurement requirements. A common measurement language would allow agencies, commercial operators, and researchers to benchmark performance, compare approaches, and identify trade-offs transparently. It could also support proportionate regulation, since rules calibrated to measurable sustainability outcomes are less likely to be either ineffective or punitive than rules drafted in the abstract. The recommended research agenda, which prioritises refining the metrics and soliciting feedback from diverse stakeholder groups, recognises that legitimacy depends on participation, and that frameworks imposed without broad consultation are unlikely to endure.

Connections across the three space domains reinforce the argument that lunar sustainability cannot be pursued in isolation. Launch activity on Earth generates emissions and affects communities near spaceports, so reducing launch mass through ISRU indirectly reduces terrestrial impacts. Orbital infrastructure, including stations that act as gateways for lunar missions, must itself be operated sustainably amid growing congestion and debris in Earth orbit, since a collision or debris-generating event could interrupt the logistics chain on which lunar operations depend. Conversely, technologies matured for the Moon, such as closed-loop life support, advanced recycling, and autonomous construction, have clear applications in orbital habitats and eventually in Mars missions, making lunar sustainability a proving ground for broader spacefaring capability.

Historical context strengthens the case for proactive rather than reactive governance. On Earth, many environmental harms were addressed only after damage became evident and costly, whereas the Planetary Boundaries framework exemplifies an attempt to define safe operating limits in advance. The Moon offers a rare opportunity to apply that lesson preemptively, before large-scale activity begins, because key decisions about landing sites, resource extraction methods, and heritage protection for sites like the Apollo landing areas are still being made. Whether future generations will judge humanity’s return to the Moon as sustainable will depend substantially on choices made in the present decade, and the framework of a Lunar Circular Economy with measurable metrics provides a concrete starting point for making those choices deliberately rather than by default.

Subject of Research: Developing a sustainable human lunar presence using space resources

Article Title: Developing a sustainable human lunar presence using space resources

Article References: Cernev, T., de Zwart, M., & Hessel, V. (2026). Developing a sustainable human lunar presence using space resources. Space and Planetary Resources, 2(1), Article 8. https://doi.org/10.1007/s44461-026-00014-x

Image Credits: AI Generated

DOI: 10.1007/s44461-026-00014-x

Keywords: Developing, sustainable, human, lunar, presence, space, resources, scientific research

The mental-health cost of war is well documented yet chronically underestimated. WHO-commissioned research published in The Lancet estimated that roughly one in five people living in conflict-affected settings — about 22 percent — experiences a mental-health condition at any given time, most commonly depression, anxiety or post-traumatic stress disorder, roughly double the prevalence seen in stable populations. These conditions are not transient. Longitudinal studies of war survivors show elevated symptoms persisting for years, sometimes decades, after violence ends, eroding work, parenting, physical health and the social trust that rebuilding depends on. Children are especially vulnerable: toxic stress during development is linked to lasting changes in emotion regulation, learning and lifelong health. The economic knock-on effects are large as well, because untreated mental disorders depress productivity, strain households and feed cycles of violence that make recovery harder. Yet in precisely the places where the need is greatest, care is scarcest. Many fragile and conflict-affected states count fewer than one psychiatrist for every 100,000 residents, and humanitarian budgets routinely devote only a small fraction of funding to mental-health and psychosocial support. The result is a vast, untreated reservoir of psychological injury — one that, the new study suggests, drought is making considerably deeper.

To understand why drought intersects so destructively with war, it helps to be precise about what drought actually is. Scientists distinguish meteorological drought — a sustained deficit in precipitation — from agricultural drought, in which soil moisture falls too low to sustain crops, and hydrological drought, in which rivers, reservoirs and aquifers run down. Each form is tracked with standardized indices, such as the Standardized Precipitation Index, that measure how far conditions deviate from long-term norms. What sets drought apart from an earthquake or a flood is its slow onset and punishing duration: it is a creeping emergency that can persist for years, eroding livelihoods grain by grain. Unlike a flood, whose damage is concentrated and visible, a drought’s damage diffuses into prices, harvests and household decisions, making it harder to see — and easier to ignore. The scale is growing. The United Nations Convention to Combat Desertification estimates that the number and duration of droughts have increased by 29 percent since 2000, and the Intergovernmental Panel on Climate Change projects that additional warming will intensify agricultural and ecological drought across many already water-stressed regions — including several that overlap with the world’s active conflict zones.

Even on its own, drought leaves a distinct psychological signature. Studies of farming and herding communities have linked prolonged water shortage to chronic stress, hopelessness and elevated suicide risk; a major meta-analysis published in Nature Climate Change concluded that suicide rates themselves rise as temperatures climb. Rural populations whose identities and incomes rest on land and livestock are hit first and hardest, and research on agricultural communities documents strong associations between drought and both anxiety and depressive symptoms. Surveys of roughly 10,000 young people across ten countries, published in The Lancet Planetary Health, found that nearly six in ten were very or extremely worried about climate change — a phenomenon now studied under the label of eco-anxiety. Psychologically, drought fuses two especially potent stressors: loss of control over one’s material survival, and uncertainty that never resolves, because no one can say when the rains will return. Chronic activation of the body’s stress machinery — the hypothalamic-pituitary-adrenal axis, which governs cortisol release — is implicated in depression, memory impairment and inflammatory disease. Drought, in other words, is not merely an economic shock. It is a sustained assault on mental well-being even before any bullets fly.

The central contribution of the new paper is to show what happens when these two assaults collide. In the language of statistics, drought does not simply add a fixed amount of distress on top of war’s toll; it behaves as an effect modifier, changing the very relationship between conflict exposure and psychological harm. If the burdens were merely additive, a person enduring both war and drought would face the sum of two separate risks. Amplification implies something more troubling: under drought conditions, the same degree of war exposure produces a larger psychological toll than it would in water-secure times. Climate scientists have a framework for such overlaps — compound events, in which multiple hazards interact to produce impacts greater than their parts, a concept that now runs through IPCC assessments. What Döring and colleagues make unmistakable is that mental health belongs squarely inside that framework. The distinction is not academic hair-splitting. Additive risks can be managed with parallel programs; interactive risks demand integrated ones, because treating one hazard while ignoring the other leaves the amplification intact. War and drought, managed by policymakers as separate problems in separate ministries, are in reality a single, mutually reinforcing crisis with a compounded human price.

The mechanisms behind this amplification form a cascade that researchers are only beginning to map. Drought destroys harvests and livestock, driving food insecurity, and hunger is tightly coupled to psychological distress: food-insecure households show sharply elevated rates of depression, particularly among mothers, while childhood malnutrition interacts with chronic stress to shape emotional development for a lifetime. Water scarcity forces families — usually women and girls — into longer and more dangerous journeys to collect water, and unsanitary conditions raise the risk of disease outbreaks that layer grief and exhaustion onto scarcity. Heat that accompanies drought disrupts sleep, shortens tempers and is consistently associated with spikes in aggression and interpersonal violence. Meanwhile, drought strips away rural livelihoods and the farming and herding identities that anchor community life, pushing families into displacement, where social support networks fray exactly when they are needed most. Humanitarian agencies, stretched thin by war, are typically resourced for either a conflict response or a climate shock — not both at once. Services crack precisely when psychological need peaks, and untreated distress accumulates in the population like water behind a failing dam.

Nor is the overlap hypothetical; it describes much of the contemporary map of human misery. Syria endured a devastating multi-year drought from 2006 to 2010 that destroyed harvests and helped displace well over a million rural residents — an upheaval that some scholars argued fed the unrest that followed, though that causal chain remains contested in the research literature. The Horn of Africa has seen drought and violence intertwined for decades: Somalia’s 2011 famine unfolded amid active conflict, and the 2020–2023 drought, the region’s driest stretch in some forty years, displaced millions even as fighting blocked aid. In the Sahel, shrinking pastures and dwindling water points have been repeatedly linked to clashes between herders and farming communities. Security analysts adopted the phrase “threat multiplier” years ago to describe how climate stress magnifies existing instability. What the new study adds is a precise psychological dimension to that security language: the multiplier operates inside human minds as well as across battlefields.

Measuring these effects is notoriously difficult, which is what makes rigorous work in this area so consequential. Mental-health surveys inside active war zones battle attrition, danger and the simple impossibility of reaching besieged populations; drought, meanwhile, must be quantified objectively across space and time rather than assumed. Any analysis must also guard against confounding — poverty, weak institutions and pre-existing violence all shape both climate vulnerability and mental health, and disentangling drought’s independent contribution from war’s is a statistical tightrope. Researchers therefore triangulate, combining standardized drought indices with longitudinal mental-health data and models that test explicitly whether drought modifies the effect of conflict exposure. No single study can settle such questions definitively; the field’s conclusions rest on converging lines of evidence rather than any one dataset. But the direction of that evidence is consistent, and its implication is uncomfortable: as warming deepens drought in fragile states, the psychological price of every ongoing war is quietly rising, compounding year after year. The relationship also cuts both ways. If drought deepens war’s psychological damage, then easing drought — through water infrastructure, food aid or insurance schemes — should measurably lighten that damage, a testable prediction that gives the finding practical force.

The policy implications cut across humanitarian aid, climate adaptation and security planning. Mental-health and psychosocial support — long among the most underfunded components of emergency responses — cannot remain an afterthought bolted onto food distributions; the World Health Organization’s mhGAP programme and inter-agency guidelines on mental health in emergencies provide blueprints that rarely reach anything like scale. Drought early-warning systems and forecast-based financing, which release funds before a crisis peaks, could be explicitly paired with psychosocial services so that counseling arrives alongside the water trucks. Investments in drought-resilient water infrastructure, drought-tolerant crops and social-protection schemes should be understood, explicitly, as mental-health interventions, because they blunt the stress cascade before it begins. And climate finance, which has been slow to reach fragile and conflict-affected states, will need to treat those states as priorities rather than exceptions. If drought amplifies the psychological burden of war, the arithmetic of suffering becomes brutal: the droughts of the coming decades will not wait for the wars to end, and it is minds — not only harvests — that will bear the difference.