Distribution of intermediate host snails of schistosomiasis and fascioliasis in relation to environmental factors during the dry season in the Tchologo region, Côte d’Ivoire

Krauth, Stefanie J.; Wandel, Nathalie; Traoré, Sidy; Vounatsou, Penelope; Hattendorf, Jan; Achi, Louise Y.; McNeill, Kristopher; N’Goran, Eliézer K.; Utzinger, Jürg

doi:10.1016/j.advwatres.2016.11.016

Cited by 12 publications

(13 citation statements)

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“…Historical studies, based on chetotaxy and allozymic markers, have also suggested the occurrence of natural S. bovis × S. curassoni hybrids in northern and central parts of Côte d’Ivoire, which have also been characterized in Niger and Senegal [41, 45]. However, no S. curassoni molecular signal was observed in these data [21] and no Bulinus umbilicatus , the intermediate host snail of S. curassoni was found.…”

Section: Discussionmentioning

confidence: 99%

“…In Côte d’Ivoire, it has been reported that S. haematobium is mainly transmitted by B. truncatus in the northern part of the country, while in central Côte d’Ivoire, both B. truncatus and B. globosus are involved in transmission [ 21 – 24 ]. In addition, the presence of S. bovis in northern Côte d’Ivoire has been highlighted with transmission involving three different snail species; B. truncatus , B. globosus and B. forskalii [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Molecular characterization and distribution of Schistosoma cercariae collected from naturally infected bulinid snails in northern and central Côte d’Ivoire

et al. 2019

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BackgroundAccurate identification of schistosome species infecting intermediate host snails is important for understanding parasite transmission, schistosomiasis control and elimination. Cercariae emerging from infected snails cannot be precisely identified morphologically to the species level. We used molecular tools to clarify the distribution of the Schistosoma haematobium group species infecting bulinid snails in a large part of Côte d’Ivoire and confirmed the presence of interspecific hybrid schistosomes.MethodsBetween June 2016 and March 2017, Bulinus snails were sampled in 164 human-water contact sites from 22 villages of the northern and central parts of Côte d’Ivoire. Multi-locus genetic analysis (mitochondrial cox1 and nuclear ITS) was performed on individual schistosome cercariae shed from snails, in the morning and in the afternoon, for species and hybrid identification.ResultsOverall, 1923 Bulinus truncatus, 255 Bulinus globosus and 1424 Bulinus forskalii were obtained. Among 2417 Bulinus screened, 25 specimens (18 B. truncatus and seven B. globosus) shed schistosomes, with up to 14% infection prevalence per site and time point. Globally, infection rates per time point ranged between 0.6 and 4%. Schistosoma bovis, S. haematobium and S. bovis × S. haematobium hybrids infected 0.5%, 0.2% and 0.4% of the snails screened, respectively. Schistosoma bovis and hybrids were more prevalent in B. truncatus, whereas S. haematobium and hybrid infections were more prevalent in B. globosus. Schistosoma bovis-infected Bulinus were predominantly found in northern sites, while S. haematobium and hybrid infected snails were mainly found in central parts of Côte d’Ivoire.ConclusionsThe data highlight the necessity of using molecular tools to identify and understand which schistosome species are transmitted by specific intermediate host snails. The study deepens our understanding of the epidemiology and transmission dynamics of S. haematobium and S. bovis in Côte d’Ivoire and provides the first conclusive evidence for the transmission of S. haematobium × S. bovis hybrids in this West African country.Trial registration ISRCTN, ISRCTN10926858. Registered 21 December 2016; retrospectively registered (see: http://www.isrctn.com/ISRCTN10926858)Electronic supplementary materialThe online version of this article (10.1186/s13071-019-3381-3) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular characterization and distribution of Schistosoma cercariae collected from naturally infected bulinid snails in northern and central Côte d’Ivoire

et al. 2019

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“…The higher prevalence of Schistosoma and Fasciola found in the northern parts of Côte d'Ivoire compared to the South might be explained by the many small multipurpose dams built in the North in the 1970s and 1980s. Indeed, dams play a crucial role in maintaining the lifecycle of snail-borne infections, and some studies have shown the presence of intermediate snail hosts of Schistosoma and Fasciola in North Côte d'Ivoire [61,62]. In Senegal, trematode infection increased after the construction of large dams across major rivers in the Senegal River basin [63].…”

Section: Discussionmentioning

confidence: 99%

“…The hydrography is composed of rivers running from North to South and several small multipurpose dams, mainly used for cattle breeding in the North [77]. The rivers and dams provide suitable habitats for intermediate host snails of schistosomiasis and fascioliasis [61] and the savannah with its grass is favourable for cattle breeding.…”

Section: Study Areamentioning

confidence: 99%

Prevalence and distribution of livestock schistosomiasis and fascioliasis in Côte d’Ivoire: results from a cross-sectional survey

Kouadio

Evack

Achi³

et al. 2020

BMC Vet Res

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Background Schistosoma and Fasciola are zoonotic parasites of public health and veterinary importance. However, while the epidemiology of schistosomiasis in humans is well studied, little is known about fascioliasis and schistosomiasis in livestock in Côte d’Ivoire. This study aimed to determine the prevalence and the distribution of livestock schistosomiasis and fascioliasis across Côte d’Ivoire. In 2018, we conducted a cross-sectional survey in abattoirs and farms in 13 departments of Côte d’Ivoire. In abattoirs, the mesenteric veins and livers of slaughtered cattle, sheep and goats were examined for adult Schistosoma and Fasciola flukes. Faeces from live cattle, goats and sheep were collected and examined for Schistosoma and Fasciola eggs using a sedimentation technique. Results A total of 386 cattle, 174 goats and 151 sheep from abattoirs and 435 cattle, 22 goats and 176 sheep from farms were sampled. The observed prevalence of schistosomiasis was higher in slaughtered animals. Fascioliasis was more prevalent in farm animals. The prevalence of schistosomiasis in slaughtered cattle varied between 5.9% (95% confidence interval (CI): 0.7–19.7%) and 53.3% (95% CI: 37.9–68.3%) with the highest prevalence observed in Ouangolodougou in the North. Cattle from farms had a relatively low prevalence of schistosomiasis, with the highest prevalence found in Ouangolodougou (2.4%, 95% CI: 0.7–6.1%). The prevalence of fascioliasis varied considerably from one department to another, ranging from nil (95% CI: 0.0–18.5%) to 50.8% (95% CI: 43.4–58.2%), with the highest prevalence found in farm cattle in Dikodougou in the North. Sheep and goats had a lower prevalence of schistosomiasis and fascioliasis than cattle. In slaughtered animals, cattle aged 4 years and older were at highest risk for schistosomiasis (odds ratio (OR): 2.4; 95% CI: 1.0–5.6) and fascioliasis (OR: 2.1; 95% CI: 1.1–3.9). In farm animals, male cattle had higher odds of being infected with Schistosoma (OR: 4.3; 95% CI: 0.7–26.9) than females. Conclusions Our study confirms that schistosomiasis and fascioliasis are endemic in livestock across Côte d’Ivoire. A strategic control programme should be considered, especially for cattle, including providing drinking water in troughs to reduce faecal contamination of water sources by cattle.

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“…2). These areas are known to harbour B. truncatus [47][48][49] which is predominantly involved in the transmission of S. haematobium, S. bovis and the S. haematobium x S. bovis hybrid [50].…”

Section: Study Areamentioning

confidence: 99%

Spatial variation of life-history traits in the freshwater snail Bulinus truncatus, the intermediate host of human and cattle schistosomiasis, in relation to field application of niclosamide in northern and central Côte d’Ivoire

Konan¹,

Tian-Bi²,

Diakité³

et al. 2021

Preprint

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Background: Control of intermediate host snails using molluscicides for the control and/or elimination of schistosomiasis is strategy in the line with WHO recommendations. Niclosamide is the main chemical molluscicide recognized by WHO. However, the extent of the application of molluscicide outside the immediate killing of the snail such as the impact on the evolution of life-history traits; in relation to recolonization of treated sites is less or not known. This study aimed to characterize the spatial variation of life-history traits in Bulinus truncatus populations in north and central Côte d’Ivoire, in relation to niclosamide spraying in the field.From 2016 to 2018, we conducted a trial to control the intermediate host snails for interrupting seasonal transmission urinary schistosomiasis in northern and central Côte d’Ivoire, using niclosamide. The molluscicide was sprayed three times per year in habitats harboring the freshwater snail B. truncatus. Snails were collected before niclosamide application and 2-3 months after the sites were treated, and also from some untreated sites. Families from six natural populations of snails were monitored for several life-history traits, including growth, fecundity and survival, under laboratory conditions, over one generation (G1).Results: Survival rate varied among populations with the highest rates observed in northern populations. No significant difference was detected between populations before and after treatment, for this trait. Numbers of eggs and eggs per capsule at first reproduction, fecundity and growth were significantly lower in treated than untreated groups. Similar finding was observed for populations of before and after treatment. Egg production also varied across populations with the highest values found in northern populations. Within treated group, a significant difference for survival rate was detected between northern and central populations. Almost all parameters of reproduction and growth varied significantly, except for the number of egg capsules.Conclusions: Our study shows a spatial variation of life-history traits in B. truncatus snails. Lower values of these traits were observed in populations from recolonized sites after treatment with niclosamide. This trend was much more perceptible in populations from central Côte d’Ivoire. Investigations should be carried out over several generations of snails in order to clarify the impact of niclosamide on their life-history traits.

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Distribution of intermediate host snails of schistosomiasis and fascioliasis in relation to environmental factors during the dry season in the Tchologo region, Côte d’Ivoire

Cited by 12 publications

References 42 publications

Molecular characterization and distribution of Schistosoma cercariae collected from naturally infected bulinid snails in northern and central Côte d’Ivoire

Molecular characterization and distribution of Schistosoma cercariae collected from naturally infected bulinid snails in northern and central Côte d’Ivoire

Prevalence and distribution of livestock schistosomiasis and fascioliasis in Côte d’Ivoire: results from a cross-sectional survey

Spatial variation of life-history traits in the freshwater snail Bulinus truncatus, the intermediate host of human and cattle schistosomiasis, in relation to field application of niclosamide in northern and central Côte d’Ivoire

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