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review · Epilepsia Open

Onchocerciasis‐associated epilepsy: From recent epidemiological and clinical findings to policy implications

201770 citationsOpen accessUniversité de Kinshasa (UNIKIN)

In plain language

High rates of epilepsy occur across multiple regions where onchocerciasis is endemic. Onchocerciasis-associated epilepsy manifests in several clinical forms, including nodding syndrome and Nakalanga syndrome, although generalised tonic-clonic seizures represent the most frequent presentation. Seizures typically begin between the ages of 3 and 18, displaying distinct clustering within specific families and in villages situated near rapid-flowing, black-fly-infested rivers. Addressing this public health issue requires an integrated management strategy. A proposed approach combines active surveillance for epilepsy cases with prompt administration of antiepileptic medications. Alongside clinical care, increasing the geographical and therapeutic coverage of community-directed treatment with ivermectin aims to prevent onchocerciasis transmission. Together, these combined surveillance and treatment measures offer a pathway to substantially lower the overall burden of disease in affected communities.

Key takeaways

  • High epilepsy prevalence occurs across many regions where onchocerciasis is endemic.
  • Onchocerciasis-associated epilepsy primarily presents as generalised tonic-clonic seizures, but also includes nodding syndrome and Nakalanga syndrome.
  • Seizure onset typically happens between ages 3 and 18, clustering within families and villages near black-fly-infested rivers.
  • A combined strategy of active epilepsy surveillance, early antiepileptic treatment, and expanded community-directed ivermectin distribution can substantially reduce disease burden.

Why it matters

Onchocerciasis-associated epilepsy severely affects children and young people living near river systems in endemic regions. Linking parasite control to neurological care provides public health bodies with an actionable roadmap. By uniting community-wide antiparasitic treatment with antiepileptic care, health authorities and local programmes can actively reduce disability and protect vulnerable populations from long-term neurological illness.

Commercialisation angle

The findings outline an operational public health strategy using existing medicines, specifically antiepileptic drugs and ivermectin, rather than a new proprietary technology. The primary end users are public health authorities, community healthcare workers, and non-governmental organisations delivering treatment programmes in endemic areas. Because the required therapeutics and community distribution models already exist, the approach represents an applied, deployment-ready public health intervention rather than an early-stage lab innovation.

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Abstract

A high prevalence of epilepsy is reported in many onchocerciasis-endemic regions. In this paper we discuss recent epidemiological and clinical aspects as well as public health implications of onchocerciasis-associated epilepsy (OAE) and propose a strategy to reduce the burden of disease. OAE probably presents in a variety of clinical manifestations, including the nodding syndrome and the Nakalanga syndrome. The most common clinical presentation, however, is generalized (primarily tonic-clonic) seizures. A characteristic of OAE is the onset of seizures between the ages of 3 and 18 years and clustering in certain families and villages close to rapid-flowing black-fly-infested rivers. A strategy combining active surveillance for epilepsy with early treatment with antiepileptic drugs and prevention of onchocerciasis by increasing the geographical and therapeutic coverage of community-directed treatment with ivermectin (CDTi) may considerably decrease the burden of disease.

Research topics

  • Parasitic Diseases Research and Treatment
  • Parasite Biology and Host Interactions
  • Insects and Parasite Interactions

Sustainable Development Goals

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DOI: 10.1002/epi4.12054

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