Papers by Alphousseyni NDONKY
Journal of Geographic Information System, Dec 31, 2022
Basic infrastructures and services present an important socioeconomic and territorial equity issu... more Basic infrastructures and services present an important socioeconomic and territorial equity issue, because the availability of these makes it possible to improve the living conditions of populations, makes territories attractive and stimulates their development. The objective of our study has been achieved, so our results provided information on the rate of propagation of basic infrastructures and services, as well as the evolution of the forms of spatial distribution of the latter. The data used comes from the census and geolocation of basic infrastructures and services in the Niakhar area, carried out by the IRD in 2018. Centrographic measurements were used to describe the overall spatial distribution and the use of chi-square statistics confirmed the existence of a preferential direction of distribution. To verify the existence of a spatial structure of infrastructure and service seeding, the Ripley statistic is used. Our results can be useful for land use planning and spatial resource allocation policies. Indeed, the identification of different types of spatial aggregates and the highlighting of the preferred directions of the distribution of basic infrastructures and services, make it possible to correct disparities in the spatial distribution of basic resources.
<p>Black circles indicate the location of 50 study sites in 2008. Names of sites are listed... more <p>Black circles indicate the location of 50 study sites in 2008. Names of sites are listed below.</p
Scientific Journal of Microbiology (SJM) is an international peer-reviewed journal dedicated to p... more Scientific Journal of Microbiology (SJM) is an international peer-reviewed journal dedicated to publish the results of original research in shape of original articles, reviews and short communications. Scope of the journal includes:fungi and other unicellular eukaryotic organisms. Topics include structure and function, biochemistry, enzymology, metabolism and its regulation, molecular biology, genetics, plasmids and transposons, general microbiology, applied microbiology, genetic engineering, virology, immunology, clinical microbiology, microbial ecology, environmental microbiology, food microbiology, molecular systematics, chemical or physical haracterization of microbial structures or products, and basic biological properties of organisms.
Journal of Geographic Information System
Revue d'Épidémiologie et de Santé Publique, 2010
GI_Forum 2014 – Geospatial Innovation for Society, 2015
Population and Environment, 2014
PLoS ONE, 2012
Introduction: The objective of this study was to measure the rate of asymptomatic carriage of pla... more Introduction: The objective of this study was to measure the rate of asymptomatic carriage of plasmodium in the Dakar region two years after the implementation of new strategies in clinical malaria management. Methodology: Between October and December 2008, 2952 households selected in 50 sites of Dakar area, were visited for interviews and blood sampling. Giemsa-stained thick blood smears (TBS) were performed for microscopy in asymptomatic adult women and children aged 2 to 10 years. To ensure the quality of the microscopy, we performed a polymerase chain reaction (PCR) with real time qPCR in all positive TBS by microscopy and in a sample of negative TBS and filter paper blood spots. Results: The analysis has concerned 2427 women and 2231 children. The mean age of the women was 35.6 years. The mean age of the children was 5.4 years. The parasite prevalence was 2.01% (49/2427) in women and 2.15% (48/2231) in children. Parasite prevalence varied from one study site to another, ranging from 0 to 7.41%. In multivariate analysis, reporting a malaria episode in 2008 was associated with plasmodium carriage (OR = 2.57, P = 0.002) in women; in children, a malaria episode (OR = 6.19, P,0.001) and a travel out of Dakar during last 3 months (OR = 2.27, P = 0.023) were associated with plasmodium carriage. Among the positive TBS, 95.8% (93/97) were positive by plasmodium PCR. Among the negative TBS, 13.9% (41/293) were positive by PCR. In blood spots, 15.2% (76/500) were positive by PCR. We estimated at 16.5% the parasite prevalence if PCR were performed in 4658 TBS. Conclusion: Parasite prevalence in Dakar area seemed to be higher than the rate found by microscopy. PCR may be the best tool for measuring plasmodium prevalence in the context of low transmission. Environmental conditions play a major role in the heterogeneity of parasite prevalence within sites.
Cybergeo, 2014
Nous tenons à remercier les organisateurs du colloque « images et villes » qui s'est tenu à Paris... more Nous tenons à remercier les organisateurs du colloque « images et villes » qui s'est tenu à Paris les 12 et 13 décembre 2011 pour cette belle opportunité de discussion et leur retour sur cet article. Cet article s'intègre dans la continuité des travaux entrepris grâce au programme ANR ACTUPALU (07-SEST-001). Nous remercions donc particulièrement Jean-Yves Le Hesran et Richard Lalou pour leur soutien. Les commentaires de Frédéric Audard ont grandement contribué à l'amélioration de cet article. Nous remercions également le programme ISIS du CNES (Centre National d'Etudes Spatiales) pour l'accès aux images SPOT-5. Dakar : travailler avec des données imparfaites 1 2 Les recensements sont, dans ce cadre, des ressources souvent utiles. L'expérience montre qu'un investissement dans leur exploration, leur mise en espace (via l'intégration dans des systèmes d'information géographique) et leur analyse peut enrichir la compréhension et la description de divers phénomènes (Merchant et al., 2011 ; Guilmoto et al., 2002). En outre, les données issues de l'imagerie satellite sont de plus en plus aisément disponibles à des résolutions spectrales, spatiales et temporelles pouvant satisfaire les besoins Qualifier les espaces urbains à Dakar, Sénégal
Genus
Strengthening civil registration systems requires a better understanding of motivations and barri... more Strengthening civil registration systems requires a better understanding of motivations and barriers related to the registration of deaths. We used data from the 2013 Senegalese census to identify deaths that are more likely to be registered in the Dakar region, where the completeness of death registration is higher than 80%. We also interviewed relatives of the deceased whose death had been registered to collect data on reasons for registration and sources of information about the process. The likelihood of death registration was positively associated with age at death and household wealth. Death registration was also more likely in households whose head was older, had attended school, and had a birth certificate. At the borough commune level, the geographical accessibility of civil registration centres and population density were both positively associated with completeness of death registration. The main motivations for registering deaths were compliance with the legal obligation...
Journal of Geographic Information System
Palgrave Communications
In Africa, adaptation will be crucial to offset expected negative climate change impacts on food ... more In Africa, adaptation will be crucial to offset expected negative climate change impacts on food security and agriculture development. In this study, we combine meteorological data from 18 local stations, field surveys on agricultural practices and agronomic information on the growth of millet to demonstrate the crop suitability to the present climate and the ability of Senegalese farmers to adapt their practices to climate variability, and to disseminate them. From data collected in both 665 villages and 1061 farmers, our study provides quantitative evidence of the responsive adaptation of farmers in the Sahel where the recent resumption of rainfall has provided new agricultural opportunities. Statistical models and cropping simulations show that these farmers innovate by reintroducing and disseminating a long cycle millet cultivar-more suitable for wet environments. We note that although this adaptation is a clear response to recent changes in quantity and distribution of rainfall, its adoption remains limited (50% of the villages visited and 25% of the surveyed agricultural producers have cultivated the new millet variety) and varies strongly within the same climatic context and by characteristics of farmers (willing and capacity), indicating different agricultural strategies (diversification, market exchanges). If land access and development of cash crops are hindrances to the adoption of sanio, poverty is clearly not a barrier and adaptation is not a lever for wealth creation. Such adaptative capacities, together with government incentives for farmers to sustainably adapt to climate change, can be important in reducing climate risks in the coming years.
Cybergeo, 2015
Urban environment is generally more equipped in healthcare services than rural areas. However, th... more Urban environment is generally more equipped in healthcare services than rural areas. However, the spatial distribution of these latter is often uneven there. We propose to measure these socio-spatial disparities of geographical accessibility to health services in Dakar’s agglomeration, using two stages floating catchment areas improved method and the local indicators of spatial association. The data used come from the general census of the population and housing in 2002 and of georeferencement of health structures in 2007. The results show strong spatial disparities in accessibility, a local spatial association between the accessibility and the level of life, indicating a contrast between the east, where there is a double handicap related to the low level of accessibility and low standard of living, and the west, where the reverse phenomenon is observed. Beyond this opposition, there are also pockets of local heterogeneity reminiscent of the complexity of Dakar’s area.
Health Policy and Planning
Urban malaria is considered a major public health problem in Africa. The malaria vector is well a... more Urban malaria is considered a major public health problem in Africa. The malaria vector is well adapted in urban settings and autochthonous malaria has increased. Antimalarial treatments prescribed presumptively or after rapid diagnostic tests are also highly used in urban settings. Furthermore, health care strategies for urban malaria must comply with heterogeneous neighbourhood ecosystems where health-related risks and opportunities are spatially varied. This article aims to assess the capacity of the urban living environment to mitigate or increase individual or household vulnerabilities that influence the use of health services. The data are drawn from a survey on urban malaria conducted between 2008 and 2009. The study sample was selected using a two-stage randomized sampling. The questionnaire survey covered 2952 households that reported a case of fever episode in children below 10 years during the month before the survey. Self-medication is a widespread practice for children,...
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Papers by Alphousseyni NDONKY