ArticlePLoS neglected tropical diseases2025
Breaking down malaria outbreak: A multidisciplinary approach in a border village of French Guiana.
Article in PLoS neglected tropical diseases, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundIsolated areas of malaria transmission can persist in countries nearing malaria elimination. To tailor interventions accordingly, smaller-scale surveillance and a deeper understanding of local conditions are needed, including human, environmental and vectorial parameters, and how these parameters interact. This study investigated the potential at-risk situations that could explain the dynamics of malaria persistence in an isolated recurrent high transmission area in French Guiana, using a transdisciplinary approach. METHODOLOGY/PRINCIPAL
findingsWe implemented an ancillary study in Trois-Palétuviers (200 inhabitants), an isolated village in French Guiana bordering Brazil. This was based on two cross-sectional surveys conducted from September to December in 2017 and 2018 that collected both malaria prevalence and behavioural data. Entomological data were collected using 4 Mosquito Magnet traps for three consecutive nights each month. A total of 182 participants were included. The median age was 12.5 years in 2017 (IQR [5;27]). Malaria PCR prevalence was 51% (n = 92) in 2017 and 16% (n = 30) in 2018. Almost all participants used bed nets (99%, n = 180) - but 88% had at least one factor of bed nets ineffectiveness (mainly inadequate drying and washing) -, 63% (n = 114) used indoor insecticides and 32% (n = 57) used skin repellents. Anopheles darlingi, representing 99.7% of the Anopheles caught, were captured throughout the night, with higher abundance in the evening and early morning. No An. darlingi were found in slash-and-burn fields. The high relative abundance of An. darlingi before bedtime exposed inhabitants to the vector's bites. CONCLUSIONS/SIGNIFICANCE: The absence of An. darlingi in expected locations, such as slash-and-burn fields, points to the complex ecology of malaria transmission and underscores the need for a nuanced understanding of environmental influences, with continuous surveillance. Cross-description of the data suggests a high risk of exposure to mosquito bites by residents before they are protected by bed nets. The inadequacy of anti-vectorial protective measures could be mitigated by education campaigns about protective tools, and by additional protective tools and a frequent distribution of bed nets.
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