Severe Childhood Malaria Impairs Cognition Up to 15 Years Later

The Lingering Shadow of Severe Childhood Malaria

Severe malaria affects millions of children globally and remains a leading cause of acquired neurodisability in endemic regions [1, 2]. While acute survival rates have improved, clinicians increasingly recognize that severe manifestations, such as cerebral malaria and severe malarial anemia, often leave children with sustained neurocognitive deficits [3, 1]. Previous research has documented impairments in attention, memory, and executive function in the immediate years following infection [3, 1]. However, the trajectory of these developmental challenges as children transition into adolescence has remained poorly characterized [4]. A recent study of 889 children now clarifies the long-term cognitive and academic outcomes for these survivors, offering critical insights into how acute clinical markers, specifically acute kidney injury and elevated angiopoietin-2, predict lasting impairment 4 to 15 years post-infection [4].

Tracing Long-Term Outcomes in a Ugandan Cohort

Although clinicians have established that cerebral malaria and severe malarial anemia cause cognitive and academic deficits 1 to 2 years after the initial episode, the persistence of these impairments into later childhood and adolescence has remained a clinical blind spot. To determine whether severe malaria is associated with long-term developmental delays, researchers assessed Ugandan children enrolled in two prior cohort studies. A total of 1247 children completed the initial studies between 2008 and 2018. The investigators achieved a high retention rate for this longitudinal follow-up, successfully tracing 958 of the original participants (77%) and enrolling 939 (75%) in the present study between 2020 and 2023. After excluding older participants, data from 889 individuals younger than 18 years were analyzed to assess ongoing neurodevelopmental progress. The final cohort had a mean age of 11.1 years (SD, 3.4), and 44.2% were female. To capture the extended developmental trajectory, participants were tested 4 to 15 years (mean, 8.4 [SD, 2.7] years) after their severe malaria episode. This extended timeline provides physicians with a clearer picture of how early neurological insults from severe malaria affect patients as they progress through primary and secondary education, a critical period for acquiring independent life skills.

Specific Malaria Phenotypes Drive Cognitive and Math Deficits

To isolate the effects of specific disease manifestations, the researchers categorized the participants into distinct exposure groups. The analysis included children with a history of cerebral malaria (n = 184) and those who had experienced severe malarial anemia (n = 249). A third exposure group consisted of children who survived other forms of severe malaria, specifically respiratory distress, complicated seizures, or prostration (n = 239). These clinical phenotypes were compared against a control group of unaffected community children (n = 217). The investigators evaluated the long-term neurodevelopmental impact by measuring age-adjusted z scores (a statistical measure quantifying how far a child's performance deviates from the age-matched average) for overall cognitive ability, attention, and academic achievement in math and reading. The data revealed that specific severe malaria phenotypes drive distinct long-term deficits. Compared with community children, those with a history of cerebral malaria had significantly lower scores in overall cognition (adjusted mean difference, -0.41; Bonferroni-corrected 95% CI, -0.74 to -0.09) and math (adjusted mean difference, -0.46; 95% CI, -0.78 to -0.14). Similarly, children with severe malarial anemia demonstrated lower scores in overall cognition (adjusted mean difference, -0.31; 95% CI, -0.61 to -0.01) and math (adjusted mean difference, -0.32; 95% CI, -0.61 to -0.03). Interestingly, not all cognitive and academic domains were equally affected, as attention and reading scores did not differ significantly between these groups and the community controls. Furthermore, the long-term neurological burden appears tied to specific disease mechanisms rather than severe illness in general. Cognitive and academic scores were not significantly different between children with other forms of severe malaria and community children. For practicing physicians, these findings underscore the need for targeted, long-term neurodevelopmental monitoring specifically for patients who survive cerebral or severe anemic presentations of the disease, rather than applying a blanket approach to all severe malaria survivors.

Acute Biomarkers Predict Long-Term Neurodevelopmental Risk

Clinicians treating acute severe malaria can use specific clinical and laboratory markers present during the initial infection to stratify patients for long-term neurodevelopmental risk. The researchers identified three acute biomarkers that predicted persistent deficits in children who survived cerebral malaria or severe malarial anemia. Specifically, acute kidney injury at the time of the severe malaria episode was associated with worse z scores in overall cognitive ability (-0.44; 95% CI, -0.80 to -0.08). Metabolic and endothelial markers also served as prognostic indicators within this high-risk cohort. Hyperuricemia during the acute infection was linked to worse overall cognitive ability (-0.45; 95% CI, -0.88 to -0.02). Furthermore, elevated plasma angiopoietin-2 levels (a biomarker of endothelial activation and vascular permeability that indicates blood-brain barrier disruption) at the time of the severe episode were associated with worse overall cognitive scores (-0.33; 95% CI, -0.63 to -0.03). Beyond overall cognition, acute kidney injury carried an additional prognostic burden for specific academic skills. In these survivors, acute kidney injury was additionally associated with lower z scores in reading (-0.42; 95% CI, -0.79 to -0.05) and math (-0.39; 95% CI, -0.74 to -0.04). For practicing physicians, these findings indicate that renal and endothelial complications during an acute malaria infection are not merely transient systemic issues but are directly linked to long-term neurological outcomes. Identifying acute kidney injury, hyperuricemia, or elevated angiopoietin-2 during the initial hospitalization can help clinicians flag high-risk pediatric patients who will require extended academic support and cognitive follow-up well into their teenage years.

References

1. Ssemata A, Nakitende AJ, Kizito S, et al. Association of severe malaria with cognitive and behavioural outcomes in low- and middle-income countries: a meta-analysis and systematic review. Malaria Journal. 2023. doi:10.1186/s12936-023-04653-9

2. Bangirana P, Conroy AL, Opoka RO, et al. Inhaled nitric oxide and cognition in pediatric severe malaria: A randomized double-blind placebo controlled trial.. PloS one. 2018. doi:10.1371/journal.pone.0191550

3. Esht V, Sharma A, Alshehri MM, et al. Neuropsychological and behavioral benefits of virtual cognitive rehabilitation training among pediatric population surviving malaria: A systematic review and meta-analysis. International Journal of Critical Illness and Injury Science. 2025. doi:10.4103/ijciis.ijciis_74_24

4. Bangirana P, Mellencamp KA, Ren J, et al. Long-Term Cognitive Ability and Academic Achievement After Childhood Severe Malaria.. JAMA. 2026. doi:10.1001/jama.2026.0704