Incidence of CSF Pleocytosis in Malaria

Diagnostic Considerations

The presence of CSF pleocytosis in malaria cases is rare enough that when it occurs, clinicians should consider alternative or concurrent diagnoses 1
When evaluating patients returning from malaria-endemic areas, rapid blood malaria antigen tests and three thick and thin blood films should be examined for malaria parasites, regardless of CSF findings 2
Thrombocytopenia or malaria pigment in neutrophils and monocytes may be clues to malaria, even if blood films are negative 2

When CSF pleocytosis is found in a patient with fever returning from an endemic area, other tropical diseases that can cause eosinophilic meningitis should be considered, such as angiostrongyliasis, gnathostomiasis, and schistosomiasis 3

If cerebral malaria is suspected despite the presence of CSF pleocytosis, antimalarial treatment should still be initiated promptly, as cerebral malaria is a medical emergency 4
Intravenous artesunate is the first-line treatment for cerebral malaria, regardless of CSF findings 5
In patients with both malaria and CSF pleocytosis, consider empiric coverage for bacterial meningitis until cultures return negative, as co-infection is possible 4

When CSF pleocytosis is found in a patient with malaria, consider the possibility of a concurrent infection or an alternative diagnosis 6
Do not delay antimalarial treatment while awaiting CSF analysis results if cerebral malaria is suspected, as prompt treatment is essential for reducing mortality 2

The World Health Organization recommends CSF analysis to rule out other causes of encephalopathy in patients returning from malaria-endemic areas with neurological symptoms, with a focus on examining CSF findings in the context of cerebral malaria diagnosis 7, 8

CSF biomarkers such as IL-1ra, IL-8, IP-10, and others may be elevated in cerebral malaria, and could potentially serve as prognostic indicators, although the specific levels and patterns of elevation are not well-established 7, 8