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Ecology of urban malaria vectors in Niamey, Republic of Niger

Labbo, Rabiou, Fandeur, Thierry, Jeanne, Isabelle, Czeher, Cyril, Williams, Earle, Arzika, Ibrahim, Soumana, Amadou, Lazoumar, Ramatoulaye and Duchemin, Jean-Bernard 2016, Ecology of urban malaria vectors in Niamey, Republic of Niger, Malaria journal, vol. 15, Article number: 314, pp. 1-17, doi: 10.1186/s12936-016-1352-0.

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Title Ecology of urban malaria vectors in Niamey, Republic of Niger
Author(s) Labbo, Rabiou
Fandeur, Thierry
Jeanne, IsabelleORCID iD for Jeanne, Isabelle orcid.org/0000-0002-5065-9685
Czeher, Cyril
Williams, Earle
Arzika, Ibrahim
Soumana, Amadou
Lazoumar, Ramatoulaye
Duchemin, Jean-Bernard
Journal name Malaria journal
Volume number 15
Season Article number: 314
Start page 1
End page 17
Total pages 17
Publisher BioMed Central
Place of publication London, Eng.
Publication date 2016-06-08
ISSN 1475-2875
Keyword(s) malaria
Niamey
Anopheles
Anopheles gambiae
vector ecology
urban
Sahel
Niger
Science & Technology
Life Sciences & Biomedicine
Infectious Diseases
Parasitology
Tropical Medicine
ANOPHELES-GAMBIAE COMPLEX
POLYMERASE-CHAIN-REACTION
SUB-SAHARAN AFRICA
MOLECULAR-FORMS
LARVAL CONTROL
TRANSMISSION
IDENTIFICATION
AGRICULTURE
ARABIENSIS
DIVERSITY
Summary BACKGROUND: Urbanization in African cities has major impact on malaria risk. Niamey, the capital of the Republic of Niger, is situated in the West African Sahel zone. The short rainy season and human activities linked with the Niger River influence mosquito abundance. This study aimed at deciphering the factors of distribution of urban malaria vectors in Niamey.

METHODS: The distribution of mosquito aquatic stages was investigated monthly from December 2002 to November 2003, at up to 84 breeding sites, throughout Niamey. An exploratory analysis of association between mosquito abundance and environmental factors was performed by a Principal Component Analysis and confirmed by Kruskall-Wallis non-parametric test. To assess the relative importance of significant factors, models were built for Anopheles and Culicinae. In a second capture session, adult mosquitoes were collected weekly with pyrethrum sprays and CDC light-traps from June 2008 to June 2009 in two differentiated urban areas chosen after the study's first step. Members of the Anopheles gambiae complex were genotyped and Anopheles females were tested for the presence of Plasmodium falciparum circumsporozoite antigens using ELISA.

RESULTS: In 2003, 29 % of 8420 mosquitoes collected as aquatic stages were Anopheles. They were significantly more likely to be found upstream, relatively close to the river and highly productive in ponds. These factors remained significant in regression and generalized linear models. The Culicinae were found significantly more likely close to the river, and in the main temporary affluent stream. In 2009, Anopheles specimens, including Anopheles gambiae s.l. (95 %), but also Anopheles funestus (0.6 %) accounted for 18 % of the adult mosquito fauna, with a large difference between the two sampled zones. Three members of the An. gambiae complex were found: Anopheles arabiensis, Anopheles coluzzii, and An. gambiae. Nineteen (1.3 %) out of 1467 females tested for P. falciparum antigen were found positive.

CONCLUSION: The study provides valuable update knowledge on malaria vector ecology and distribution in Niamey. The identification of spatial and environmental risk factors could pave the way to larval source management strategy and allow malaria vector control to focus on key zones for the benefit of the community.
Language eng
DOI 10.1186/s12936-016-1352-0
Field of Research 1108 Medical Microbiology
Socio Economic Objective 920109 Infectious Diseases
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085831

Document type: Journal Article
Collections: School of Medicine
Open Access Collection
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.