Emergence of Schistosoma mansoni in the Niger River valley, Niger

Garba, Amadou; Labbo, Rabiou; Tohon, Zilahatou; Sidiki, Ali; Djibrilla, A.

doi:10.1016/s0035-9203(03)00070-1

Cited by 15 publications

(11 citation statements)

References 3 publications

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“…Infection in Bi. pfeifferi , while variable by month and year, was comparatively high overall, consistent with previous reports in the NRV [21, 44], and in the Niger River catchment in neighbouring Mali [63–65]. It is not clear why this is the case.…”

Section: Discussionsupporting

confidence: 85%

“…The study area transects different (broad) ecological regions, the Bassin des Dallois on the east side of the river, (a relatively more productive zone), the Liptako Sahel on the northwest side and the Plateau Goumantche on the southwest [25]. Other notable features of the study region are extensive rice growing areas supported by irrigation canal systems along the river, and the Kandadji Dam north of Tillaberi, which has been under construction since 2008 [21, 44].…”

Section: Methodsmentioning

confidence: 99%

“…Site selection was based on local knowledge of water contact sites and snail presence. Altogether, 16 villages were from the wider SCORE programme and four from an earlier study, CONTRAST [45], including two northern villages, Namari Goungou and Diambala, mixed infection foci with evidence of S. mansoni [44, 46]. Villages here are written as localities as additional villages not included in the study are often close by.…”

Section: Methodsmentioning

confidence: 99%

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Freshwater snails of biomedical importance in the Niger River Valley: evidence of temporal and spatial patterns in abundance, distribution and infection with Schistosoma spp.

et al. 2019

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BackgroundSound knowledge of the abundance and distribution of intermediate host snails is key to understanding schistosomiasis transmission and to inform effective interventions in endemic areas.MethodsA longitudinal field survey of freshwater snails of biomedical importance was undertaken in the Niger River Valley (NRV) between July 2011 and January 2016, targeting Bulinus spp. and Biomphalaria pfeifferi (intermediate hosts of Schistosoma spp.), and Radix natalensis (intermediate host of Fasciola spp.). Monthly snail collections were carried out in 92 sites, near 20 localities endemic for S. haematobium. All bulinids and Bi. pfeifferi were inspected for infection with Schistosoma spp., and R. natalensis for infection with Fasciola spp.ResultsBulinus truncatus was the most abundant species found, followed by Bulinus forskalii, R. natalensis and Bi. pfeifferi. High abundance was associated with irrigation canals for all species with highest numbers of Bulinus spp. and R. natalensis. Seasonality in abundance was statistically significant in all species, with greater numbers associated with dry season months in the first half of the year. Both B. truncatus and R. natalensis showed a negative association with some wet season months, particularly August. Prevalences of Schistosoma spp. within snails across the entire study were as follows: Bi. pfeifferi: 3.45% (79/2290); B. truncatus: 0.8% (342/42,500); and B. forskalii: 0.2% (24/11,989). No R. natalensis (n = 2530) were infected. Seasonality of infection was evident for B. truncatus, with highest proportions shedding in the middle of the dry season and lowest in the rainy season, and month being a significant predictor of infection. Bulinus spp. and Bi. pfeifferi showed a significant correlation of snail abundance with the number of snails shedding. In B. truncatus, both prevalence of Schistosoma spp. infection, and abundance of shedding snails were significantly higher in pond habitats than in irrigation canals.ConclusionsEvidence of seasonality in both overall snail abundance and infection with Schistosoma spp. in B. truncatus, the main intermediate host in the region, has significant implications for monitoring and interrupting transmission of Schistosoma spp. in the NRV. Monthly longitudinal surveys, representing intensive sampling effort have provided the resolution needed to ascertain both temporal and spatial trends in this study. These data can inform planning of interventions and treatment within the region.

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Section: Discussionsupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Freshwater snails of biomedical importance in the Niger River Valley: evidence of temporal and spatial patterns in abundance, distribution and infection with Schistosoma spp.

et al. 2019

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“…These two villages are located in an irrigated rice farming perimeter. Both S. haematobium and S. mansoni are transmitted in this area, with S. mansoni only quite recently (Labbo et al, 2003;Garba et al, 2004).…”

Section: Study Areamentioning

confidence: 99%

Efficacy and safety of two closely spaced doses of praziquantel against Schistosoma haematobium and S. mansoni and re-infection patterns in school-aged children in Niger

et al. 2013

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“…For example, co‐infections between S. mansoni and S. haematobium have been reported in an increasing number of foci in sub‐Saharan Africa (Cunin et al. 2000, 2003a; Garba et al. 2004) and also with species of STHs (Brooker et al.…”

Section: Impact Of Mass Chemotherapy On Interactions Between Differenmentioning

confidence: 99%

Evolutionary concepts in predicting and evaluating the impact of mass chemotherapy schistosomiasis control programmes on parasites and their hosts

Webster

Gower

Norton

2008

Evolutionary Applications

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SummarySchistosomiasis is a parasitic disease of significant medical and veterinary importance in many regions of the world. Recent shifts in global health policy have led towards the implementation of mass chemotherapeutic control programmes at the national scale in previously ‘neglected’ countries such as those within sub-Saharan Africa. Evolutionary theory has an important role to play in the design, application and interpretation of such programmes. Whilst celebrating the rapid success achieved to date by such programmes, in terms of reduced infection prevalence, intensity and associated human morbidity, evolutionary change in response to drug selection pressure may be predicted under certain circumstances, particularly in terms of the development of potential drug resistance, evolutionary changes in parasite virulence, transmission and host use, and/or competitive interactions with co-infecting pathogens. Theoretical and empirical data gained to date serve to highlight the importance of careful monitoring and evaluation of parasites and their hosts whenever and wherever chemotherapy is applied and where parasite transmission remains.

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Emergence of Schistosoma mansoni in the Niger River valley, Niger

Cited by 15 publications

References 3 publications

Freshwater snails of biomedical importance in the Niger River Valley: evidence of temporal and spatial patterns in abundance, distribution and infection with Schistosoma spp.

Freshwater snails of biomedical importance in the Niger River Valley: evidence of temporal and spatial patterns in abundance, distribution and infection with Schistosoma spp.

Efficacy and safety of two closely spaced doses of praziquantel against Schistosoma haematobium and S. mansoni and re-infection patterns in school-aged children in Niger

Evolutionary concepts in predicting and evaluating the impact of mass chemotherapy schistosomiasis control programmes on parasites and their hosts

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