Uneven malaria transmission in geographically distinct districts of Bobo-Dioulasso, Burkina Faso

Soma Dieudonné Diloma, Kassie Daouda, Sanou Seydou, Karama Fatou Biribama, Ouari Ali, Mamaï Wadaka, Ouédraogo Georges Anicet, Salem Gérard, Dabiré Roch Kounbobr, Fournet Florence. 2018. Uneven malaria transmission in geographically distinct districts of Bobo-Dioulasso, Burkina Faso. Parasites and Vectors:296, 10 p.

https://doi.org/10.1186/s13071-018-2857-x

Article de revue ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total

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Quartile : Q1, Sujet : TROPICAL MEDICINE / Quartile : Q1, Sujet : PARASITOLOGY

Résumé : Background: Urbanization is a main trend in developing countries and leads to health transition. Although non-communicable diseases are increasing in cities of low-income countries, vector-borne diseases such as malaria, are still present. In the case of malaria, transmission is lower than in rural areas, but is uneven and not well documented. In this study, we wanted to evaluate intra-urban malaria transmission in a West African country (Burkina Faso). Methods: A cross-sectional study on 847 adults (35 to 59 year-old) and 881 children (6 months to 5 year-old) living in 1045 households of four districts (Dogona, Yeguere, Tounouma and Secteur 25) of Bobo-Dioulasso was performed between October and November 2013. The districts were selected according to a geographical approach that took into account the city heterogeneity. Malaria prevalence was evaluated using thick and thin blood smears. Human exposure to Anopheles bites was measured by assessing the level of IgG against the Anopheles gSG6-P1 salivary peptide. Adult mosquitoes were collected using CDC traps and indoor insecticide spraying in some houses of the four neighbourhoods. The Anopheles species and Plasmodium falciparum infection rate were determined using PCR assays. Results: In this study, 98.5% of the malaria infections were due to Plasmodium falciparum. Malaria transmission occurred in the four districts. Malaria prevalence was higher in children than in adults (19.2 vs 4.4%), and higher in the central districts than in the peripheral ones (P = 0.001). The median IgG level was more elevated in P. falciparum-infected than in non-infected individuals (P < 0.001). Anopheles arabiensis was the main vector identified (83.2%; 227 of the 273 tested mosquito specimens). Five P. falciparum-infected mosquitoes were caught, and they were all caught in the central district of Tounouma where 28.6% (14/49) of the tested blood-fed mosquito specimens had a human blood meal. Conclusions: This study showed that urban malaria transmission occurred in Bobo-Dioulasso, in all the four studied areas, but mainly in central districts. Environmental determinants primarily explain this situation, which calls for better urban management.

Mots-clés géographiques Agrovoc : Burkina Faso

Mots-clés libres : Anopheles bites exposure, Burkina Faso, Malaria, Spatial heterogeneity, Urbanization

Classification Agris : L73 - Maladies des animaux
000 - Autres thèmes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

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