Rice cultivation and malaria transmission in Bouaké city (Côte d'Ivoire)

Dossou-Yovo, J.; Doannio, J.M.C.; Rivière, François; Duval, J

doi:10.1016/0001-706x(94)90097-3

Cited by 47 publications

(40 citation statements)

References 3 publications

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“…Contrary to our findings, some other studies in East and West Africa failed to establish a direct association between irrigated fields and transmission intensity (Ijumba et al, 2002;Dolo et al, 2004). For instance, in Côte d'Ivoire, despite high anopheline densities in areas bordering rice cultivation, Dossou-Yovo et al (1994) reported low sporozoite rates indicating that rice fields did not seem to have increased malaria transmission. More recent investigations in Côte d'Ivoire, however, showed that irrigated rice farming was strongly associated with malaria transmission, and entomological indictors were tightly linked to changing patterns of irrigated rice farming (Koudou et al, 2005(Koudou et al, , 2010.…”

Section: Discussioncontrasting

confidence: 99%

“…In our study, the highest EIR in the flooding rice irrigation and the lowest EIR in sugarcane ecosystem could be explained by differences in the ecological settings of the two sites, and more specifically the availability of favourable breeding sites. It has already been observed that irrigated rice cultivation enhances population development of many malaria mosquito species in sub-Saharan Africa (Chandler et al, 1975;Coosemans, 1985;Robert et al, 1985;Lacey and Lacey, 1990;Dossou-Yovo et al, 1994;Briët et al, 2003) and has been associated with high malaria transmission (Appawu et al, 2004;Dolo et al, 2004;Diuk-Wasser et al, 2005;Koudou et al, 2005). This is because rice irrigation provides ideal breeding sites for the major malaria vectors in Africa (Carnevale et al, 1999;Appawu et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

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Spatio-temporal variation in malaria transmission intensity in five agro-ecosystems in Mvomero district, Tanzania

et al. 2010

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Abstract. In Africa, malaria is predominantly a rural disease where agriculture forms the backbone of the economy. Various agro-ecosystems and crop production systems have an impact on mosquito productivity, and hence malaria transmission intensity. This study was carried out to determine spatial and temporal variations in anopheline mosquito population and malaria transmission intensity in five villages, representing different agro-ecosystems in Mvomero district, Tanzania, so as to provide baseline information for malaria interventions. The agro-ecosystems consisted of irrigated sugarcane, flooding rice irrigation, non-flooding rice irrigation, wet savannah and dry savannah. In each setting, adult mosquitoes were sampled monthly using Centers for Disease Control and Prevention (CDC) light traps from August 2004 to July 2005. A total of 35,702 female mosquitoes were collected. Anopheles gambiae sensu lato was the most abundant (58.9%) mosquito species. An. funestus accounted for 12.0% of the mosquitoes collected. There was a substantial village to village variation and seasonality in the density of Anopheles mosquito population, with peaks in May towards the end of the warm and rainy season. Significantly larger numbers of anophelines were collected from traditional flooding rice irrigation ecosystem (70.7%) than in non-flooding rice irrigation (8.6%), sugarcane (7.0%), wet savannah (7.3%) and dry savannah (6.4%). The overall sporozoite rates for An. gambiae and An. funestus were 3.4% and 2.3%, respectively. The combined overall sporozoite rate (An. gambiae+An. funestus) was 3.2%. The mean annual entomological inoculation rate (EIR) for An. gambiae s.l. was 728 infective bites per person per year and this was significantly higher in traditional flooding rice irrigation (1351) than in other agro-ecosystems. The highest EIRs for An. gambiae s.l. and An. funestus were observed during May 2005 (long rainy season) and December 2004 (short rainy season), respectively. The findings support the evidence that malaria transmission risk varies even between neighbouring villages and is influenced by agro-ecosystems. This study therefore, demonstrates the need to generate spatial and temporal data on transmission intensity on smaller scales taking into consideration agro-ecosystems that will identify area-specific transmission intensity to guide targeted control of malaria operations.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Spatio-temporal variation in malaria transmission intensity in five agro-ecosystems in Mvomero district, Tanzania

et al. 2010

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“…Several explanations have been proposed: patients' lack of resources, long distances from home to the nearest health centre, poor health services management (Huissoud et al, 2004). This situation seems common in Africa, and has been related to the fact that modern medicines often remain problematic in remote areas: even when apparently available, they are often unaffordable, misused or even counterfeit (Basco, 2004;Dossou-Yovo et al, 2001;Tumwesigire and Watson, 2002).…”

Section: Introductionmentioning

confidence: 99%

Malaria treatment in remote areas of Mali: use of modern and traditional medicines, patient outcome

Diallo¹,

Graz²,

Falquet³

et al. 2006

Transactions of the Royal Society of Tropical Medicine and Hygi

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Summary Use of official health services often remains low despite great efforts to improve quality of care. Are informal treatments responsible for keeping a number of patients away from standard care, and if so, why? Through a questionnaire survey with proportional cluster samples, we studied the case histories of 952 children in Bandiagara and Sikasso areas of Mali. Most children with reported uncomplicated malaria were first treated at home (87%) with modern medicines alone (40%), a mixture of modern and traditional treatments (33%), or traditional treatment alone (27%). For severe episodes (224 cases), a traditional treatment alone was used in 50% of the cases. Clinical recovery after uncomplicated malaria was above 98% with any type of treatment. For presumed severe malaria, the global mortality rate was 17%; it was not correlated with the type of treatment used (traditional or modern, at home or elsewhere). In the study areas, informal treatments divert a high proportion of patients away from official health services. Patients' experience that outcome after standard therapeutic itineraries is not better than after alternative care may help to explain low use of official health services. We need to study whether some traditional treatments available in remote villages should be considered real, recommendable first aid.

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“…Some crops are known to be associated with Anopheles proliferation, irrigated rice in particular (Dossou-Yovo et al, 1994;Dolo et al, 2004;Mboera et al, 2007;Sogoba et al, 2007). The results of this study probably underestimate the impact of rice cultivation for two reasons.…”

Section: Discussionmentioning

confidence: 63%

“…Other studies found that certain irrigation practices result in larger mosquito populations (Ijumba and Lindsay, 2001;Briet et al, 2003;Afrane et al, 2004;Dolo et al, 2004) but these do not necessarily lead to higher transmission levels (Ijumba and Lindsay, 2001;Dolo et al, 2004). In Bouaké, Côte d'Ivoire, Dossou-Yovo et al (1994 found high anopheline densities but low sporozoite rates in areas bordering rice cultivation, concluding that rice fields did not seem to have notably modified malaria transmission. Robert et al (1998) concluded from a study on market garden wells in Dakar, Senegal, that although wells served as breeding grounds for anophelines, these sites were not the only in sustaining the mosquito population.…”

Section: Ua and Malariamentioning

confidence: 88%

Urban agriculture and Anopheles habitats in Dar es Salaam, Tanzania

et al. 2009

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Abstract.A cross-sectional survey of agricultural areas, combined with routinely monitored mosquito larval information, was conducted in urban Dar es Salaam, Tanzania, to investigate how agricultural and geographical features may influence the presence of Anopheles larvae. Data were integrated into a geographical information systems framework, and predictors of the presence of Anopheles larvae in farming areas were assessed using multivariate logistic regression with independent random effects. It was found that more than 5% of the study area (total size 16.8 km 2 ) was used for farming in backyard gardens and larger open spaces. The proportion of habitats containing Anopheles larvae was 1.7 times higher in agricultural areas compared to other areas (95% confidence interval = 1.56-1.92). Significant geographic predictors of the presence of Anopheles larvae in gardens included location in lowland areas, proximity to river, and relatively impermeable soils. Agriculture-related predictors comprised specific seedbed types, mid-sized gardens, irrigation by wells, as well as cultivation of sugar cane or leafy vegetables. Negative predictors included small garden size, irrigation by tap water, rainfed production and cultivation of leguminous crops or fruit trees. Although there was an increased chance of finding Anopheles larvae in agricultural sites, it was found that breeding sites originated by urban agriculture account for less than a fifth of all breeding sites of malaria vectors in Dar es Salaam. It is suggested that strategies comprising an integrated malaria control effort in malaria-endemic African cities include participatory involvement of farmers by planting shade trees near larval habitats.

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Rice cultivation and malaria transmission in Bouaké city (Côte d'Ivoire)

Cited by 47 publications

References 3 publications

Spatio-temporal variation in malaria transmission intensity in five agro-ecosystems in Mvomero district, Tanzania

Spatio-temporal variation in malaria transmission intensity in five agro-ecosystems in Mvomero district, Tanzania

Malaria treatment in remote areas of Mali: use of modern and traditional medicines, patient outcome

Urban agriculture and Anopheles habitats in Dar es Salaam, Tanzania

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