PLoS Neglected Tropical Diseases (Jul 2019)

Onchocerciasis-associated epilepsy in the Democratic Republic of Congo: Clinical description and relationship with microfilarial density.

  • Joseph Nelson Siewe Fodjo,
  • Michel Mandro,
  • Deby Mukendi,
  • Floribert Tepage,
  • Sonia Menon,
  • Swabra Nakato,
  • Françoise Nyisi,
  • Germain Abhafule,
  • Deogratias Wonya'rossi,
  • Aimé Anyolito,
  • Richard Lokonda,
  • An Hotterbeekx,
  • Robert Colebunders

DOI
https://doi.org/10.1371/journal.pntd.0007300
Journal volume & issue
Vol. 13, no. 7
p. e0007300

Abstract

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BackgroundHigh epilepsy prevalence and incidence were observed in onchocerciasis-endemic villages in the Democratic Republic of Congo (DRC). We investigated the clinical characteristics of onchocerciasis-associated epilepsy (OAE), and the relationship between seizure severity and microfilarial density.MethodsIn October 2017, ivermectin-naive persons with epilepsy (PWE) were recruited from onchocerciasis-endemic areas in the Logo health zone in the DRC. Additional PWE were enrolled in the Aketi health zone, where ivermectin had been distributed annually for 14 years. Past medical history, clinical characteristics and skin snips for Onchocerca volvulus detection were obtained from participants. Bivariate and multivariable analyses were used to investigate associations with microfilarial density.ResultsOf the 420 PWE in the Logo health zone, 392 were skin snipped (36.5% positive). Generalized motor seizures were most frequent (392 PWE, 93.3%), and nodding seizures were reported in 32 (7.6%) participants. Twelve PWE (3.1%) presented Nakalanga features. Sixty-three (44.1%) skin snip-positive PWE had a family history of epilepsy, compared to only 82 (32.9%) skin snip-negative PWE (p = 0.027). Eighty-one onchocerciasis-infected PWE were recruited in the Aketi health zone. Positive correlations between seizure frequency and microfilarial density were observed in Logo (Spearman-rho = 0.175; pConclusionIn onchocerciasis-endemic regions in the DRC, a wide spectrum of seizures was observed. The occurrence of Nodding seizures and Nakalanga features, as well as an association between seizure severity and O. volvulus microfilarial density suggest a high OAE prevalence in the study villages.Trial registrationClinicalTrials.gov NCT03052998.