Summary:Purpose: Determination of epilepsy etiology in population-based studies is difficult because of the high cost of diagnostic tests. However, cost-effectiveness may be proven if preventive public-health strategies can be established from the test results. We report an epilepsy population-based study using clinical and laboratory techniques.Methods: A medical team administered an epilepsy survey to 88% of the residents by census in the rural county of Salamá, Honduras. Ninety of 100 participants identified with active epilepsy underwent a neurologic examination, videoelectroencephalography (video-EEG), brain computed tomography (CT) scan, and serum enzyme-linked immunoelectrotransfer blot (EITB) for cysticercosis. Final diagnoses were based on the International League Against Epilepsy classifications for seizures and epilepsy syndromes. Combined epidemiologic, clinical, video-EEG, neuroimaging, and serum EITB assays were used for the diagnosis of epilepsy etiologies.Results: Among 6,473 residents surveyed, 151 persons with epilepsy (prevalence rate, 23.3/1,000) were identified, 100 of whom had active epilepsy (15.4/1,000) on the prevalence day. Incidence was determined to be 92.7/100,000. Partial seizures with or without secondary generalization were common (92.2%). Symptomatic epilepsy (62%) was primarily due to neurocysticercosis (37%), perinatal brain damage (8%), post-traumatic (3%), and poststroke (2%). Eight percent were idiopathic, and 30% were cryptogenic (unknown cause).Conclusions: Symptomatic epilepsies primarily explained the high prevalence and incidence of epilepsy in Salamá. Integration of video-EEG and brain CT scan with clinical-epidemiologic evaluation was critical for determination of epilepsy etiology. Establishment of specific programs for continuation of epidemiologic surveillance, education, intervention, and long-term follow-up will benefit the Salamá region. Key Words: Honduras-Epilepsy-Epidemiology-Etiology-IncidencePrevalence-Neurocysticercosis.Epilepsy is a worldwide health problem (1-3). Recent analyses concluded that Latin America, especially Central America, has high epilepsy prevalence rates that appear to be secondary to a high frequency of symptomatic "preventable" epilepsies (4,5). Comparison data are not always available because few worldwide epidemiologic studies used standardized case-ascertainment criteria (1,3,(6)(7)(8). Primarily because of the high costs and/or multiple logistic factors, the vast majority of previous epidemiologic studies were two-phased and did not use neuroimaging or electroencephalography (EEG) to determine the etiology and syndromic classification of the epilepsies (9).The International League Against Epilepsy (ILAE) has published standardized diagnostic criteria for epileptic seizures and syndromes (10,11) and recently proposed the use of a five-axes approach to include ictal phenomena, seizure type, syndrome, etiology, and impairment (12). The cost-effectiveness of obtaining complete seizureevaluation information will be demonstrated by esta...

SUMMARYPurpose: Epilepsy is highly prevalent in developing countries like Honduras, with few studies evaluating this finding. This population-based study evaluated the impact of an 8-year public health and educational intervention program in reducing symptomatic epilepsies in rural Salamá, Honduras. Methods: We used the capture and recapture method including review of charts, previous databases, key informants from the community, and a second house-to-house survey for epilepsy. Epilepsy incidence and prevalence day after the interventions was May 5, 2005. Residents with active epilepsy with onset after May 1997 were offered neurologic evaluation, electroencephalography, and brain tomography. New data over 8 years were compared to preintervention data from the initial baseline 1997 study utilizing prevalence ratios and confidence intervals. Other calculations utilized chi square or Fisher's exact tests.Key Findings: Thirty-three of 36 patients with onset of active epilepsy after 1997 accepted evaluations to determine etiology. Symptomatic etiology was found in 58.3%. Neurocysticercosis (NCC) was again the most frequent cause (13.9%), followed by perinatal insults (11.1%). Epilepsy secondary to NCC was significantly reduced from 36.9% in 1997 (p = 0.02). The incidence (35.7/100,000) and prevalence (11.8/1,000) of active epilepsy were not significantly reduced when compared to the incidence (92.7/ 100,000) and prevalence (15.4/1,000) of active epilepsy in 1997. Significance: Our cohort appears to indicate that health and educational community interventions can reduce preventable epilepsy from NCC in a hyperendemic population in a low-resource, developing country. Plans are underway for the Honduran Government to institute this rural model countrywide.

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A mathematical model that interprets the host-vector dynamic for a serotype of dengue is presented. The model includes four different hypotheses that consist of considering latent states in the dynamics in order to analyze the effect of these states on the basic reproduction number and changes in the evolution of the disease.