Conditions of malaria transmission in Dakar from 2007 to 2010

Autor: Frédéric Pagès, Birane Cissé, Cheikh Sokhna, Libasse Gadiaga, Fanny Jarjaval, Jean Pierre Lacaux, Lydie Godefroy, Abdoulaye Gaye, Jean-François Trape, Christophe Rogier, Vanessa Machault
Přispěvatelé: Laboratoire d'aérologie (LAERO), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées
Jazyk: angličtina
Rok vydání: 2011
Předmět:
Biting Rate
lcsh:Arctic medicine. Tropical medicine
lcsh:RC955-962
Anopheles gambiae
Plasmodium falciparum
030231 tropical medicine
malaria
Antigens
Protozoan
Enzyme-Linked Immunosorbent Assay
Human Biting Rate
entomology
lcsh:Infectious and parasitic diseases
03 medical and health sciences
0302 clinical medicine
Feeding behavior
Temporal heterogeneity
Malaria transmission
Environmental health
Anopheles
parasitic diseases
medicine
Animals
Humans
lcsh:RC109-216
Malaria epidemiology
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
0303 health sciences
biology
030306 microbiology
Research
Plasmodium transmission
Feeding Behavior
Dakar
biology.organism_classification
medicine.disease
Virology
Senegal
3. Good health
Infectious Diseases
Larva
Female
Parasitology
Malaria
Human
Zdroj: Malaria Journal
Malaria Journal, BioMed Central, 2011, 10, pp.1475-2875. ⟨10.1186/1475-2875-10-312⟩
Malaria Journal, Vol 10, Iss 1, p 312 (2011)
ISSN: 1475-2875
DOI: 10.1186/1475-2875-10-312⟩
Popis: Background Previous studies in Dakar have highlighted the spatial and temporal heterogeneity of Anopheles gambiae s.l. biting rates. In order to improve the knowledge of the determinants of malaria transmission in this city, the present study reports the results of an extensive entomological survey that was conducted in 45 areas in Dakar from 2007 to 2010. Methods Water collections were monitored for the presence of anopheline larvae. Adult mosquitoes were sampled by human landing collection. Plasmodium falciparum circumsporozoïte (CSP) protein indexes were measured by ELISA (enzyme-linked immunosorbent assay), and the entomological inoculation rates were calculated. Results The presence of anopheline larvae were recorded in 1,015 out of 2,683 observations made from 325 water collections. A water pH of equal to or above 8.0, a water temperature that was equal to or above 30°C, the absence of larvivorous fishes, the wet season, the presence of surface vegetation, the persistence of water and location in a slightly urbanised area were significantly associated with the presence of anopheline larvae and/or with a higher density of anopheline larvae. Most of the larval habitats were observed in public areas, i.e., freely accessible. A total of 496,310 adult mosquitoes were caught during 3096 person-nights, and 44967 of these specimens were identified as An.gambiae s.l. The mean An. gambiae s.l. human-biting rate ranged from 0.1 to 248.9 bites per person per night during the rainy season. Anopheles arabiensis (93.14%), Anopheles melas (6.83%) and An. gambiae s.s. M form (0.03%) were the three members of the An. gambiae complex. Fifty-two An. arabiensis and two An. melas specimens were CSP-positive, and the annual CSP index was 0.64% in 2007, 0.09% in 2008-2009 and 0.12% in 2009-2010. In the studied areas, the average EIR ranged from 0 to 17.6 infected bites per person during the entire transmission season. Conclusion The spatial and temporal heterogeneity of An. gambiae s.l. larval density, adult human-biting rate (HBR) and malaria transmission in Dakar has been confirmed, and the environmental factors associated with this heterogeneity have been identified. These results pave the way for the creation of malaria risk maps and for a focused anti-vectorial control strategy.
Databáze: OpenAIRE
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