Background. With 214 million cases and 438,000 deaths in 2015, malaria remains one of the deadliest infectious diseases in tropical countries. Several species of the protozoan Plasmodium cause malaria. However, almost all the fatalities are due to Plasmodium falciparum, a species responsible for the severest cases including cerebral malaria. Immune response to Plasmodium falciparum infection is mediated by the production of pro-inflammatory cytokines, chemokines and growth factors whose actions are crucial for the control of the parasites. Following this response, the induction of anti-inflammatory immune mediators downregulates the inflammation thus preventing its adverse effects such as damages to various organs and death. Methods. We performed a retrospective, nonprobability sampling study using clinical data and sera samples from patients, mainly adults, suffering of non-cerebral or cerebral malaria in Dakar, Sénégal. Healthy individuals residing in the same area were included as controls. We measured the serum levels of 29 biomarkers including growth factors, chemokines, inflammatory and anti-inflammatory cytokines. Results. We found an induction of both pro- and anti-inflammatory immune mediators during malaria. The levels of pro-inflammatory biomarkers were higher in the cerebral malaria than in the non-cerebral malaria patients. In contrast, the concentrations of anti-inflammatory cytokines were comparable in these two groups or lower in CM patients. Additionally, four pro-inflammatory biomarkers were significantly increased in the deceased of cerebral malaria compared to the survivors. Regarding organ damage, kidney failure was significantly associated with death in adults suffering of cerebral malaria. Conclusions. Our results suggest that a poorly controlled inflammatory response determines a bad outcome in African adults suffering of cerebral malaria.
Persistent gaps in access to quality diagnostic tests undermine progress toward improved health outcomes and resilience to disease outbreaks in Africa. Furthermore, resources for strengthening laboratory systems have faced growing constraints owing to recent reductions in official direct financial assistance, highlighting an urgent need to identify investments that are high impact and minimally donor reliant. In this Perspective, we present a set of priority systems strengthening interventions based on expected impact and feasibility. These include the need for efficient and integrated testing networks, the establishment and implementation of national essential diagnostic lists, modernized procurement and supply chain practices, improved digital health standards and targeted strengthening of testing infrastructure for epidemic-prone diseases. These initiatives should be customized to local contexts and supported by reliable financing, enhanced national leadership and management capacity and updated policies. We propose that collective action focused on these priorities will improve health outcomes and be cost-saving-and will be superior to existing, more fragmented efforts to close gaps in testing. This also provides a pathway to self-reliance in health security and universal healthcare in the Africa region.