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Annah Mabidi, Matthew S Bird, Renzo Perissinotto
This study aims to investigate macroinvertebrate assemblage structure and composition across the three major waterbody types (temporary rivers, depression wetlands and semi-permanent dams) of the Eastern Cape Karoo, and to identify important environmental and spatial correlates of macroinvertebrate assemblage composition in the region. A total of 33 waterbodies (9 dams, 13 depression wetlands and 11 rivers) were sampled. Altogether, 91 taxa were recorded in November 2014 and 82 in April 2015. Twenty-seven taxa were common to all three waterbody types (across both sampling occasions), with 17 of these observed in November and 19 in April...
2017: PloS One
Nana R Diakité, Mirko S Winkler, Jean T Coulibaly, Négnorogo Guindo-Coulibaly, Jürg Utzinger, Eliézer K N'Goran
BACKGROUND: The construction and operation of small multipurpose dams in Africa have a history of altering the transmission of water-based diseases, including schistosomiasis. The current study was designed to investigate the abundance and dynamics of schistosomiasis intermediate host snails and Schistosoma infections in humans during the construction and the first years of operation of a small multipurpose dam in Côte d'Ivoire. METHODS: The study was carried out in Raffierkro and four neighbouring villages in central Côte d'Ivoire between 2007 and 2012...
May 4, 2017: Infectious Diseases of Poverty
Chester Kalinda, Moses J Chimbari, Samson Mukaratirwa
BACKGROUND: Given that increase in temperature may alter host-parasite relationships, the anticipated rise in temperature due to global warming might change transmission patterns of certain diseases. However, the extent to which this will happen is not well understood. METHODS: Using a host-parasite system involving Bulinus globosus and Schistosoma haematobium, we assessed the effect of temperature on snail fecundity, growth, survival and parasite development under laboratory conditions...
May 1, 2017: Infectious Diseases of Poverty
Rima Zein-Eddine, Félicité F Djuikwo-Teukeng, Yasser Dar, Gilles Dreyfuss, Frederik Van den Broeck
The tropical freshwater snail Bulinus truncatus serves as an important intermediate host of several human and cattle Schistosoma species in many African regions. Despite some ecological and malacological studies, there is no information on the genetic diversity of B. truncatus in Egypt. Here, we sampled 70-100 snails in ten localities in Upper Egypt and the Nile Delta. Per locality, we sequenced 10 snails at a partial fragment of the cytochrome c oxidase subunit 1 gene (cox1) and we genotyped 25-30 snails at six microsatellite markers...
April 11, 2017: Acta Tropica
Adeline P Mewabo, Roger S Moyou, Lysette E Kouemeni, Jeanne Y Ngogang, Lazare Kaptue, Ernest Tambo
BACKGROUND: Urogenital schistosomiasis is a parasitic infection of public health importance that affects over 112 million people worldwide. The study aimed at assessing the urogenital schistosomiasis prevalence and risk factors of transmission around Mape dam suburds in Malantouen district, West, Cameroon. METHODS: The study was conducted using semi-structured pretested questionnaires to collect socio-demographic and ecological data. Urine samples were also collected and used to confirm the prevalence of schistosomiasis in consented school-aged children in four primary schools between March - July 2014...
March 6, 2017: Infectious Diseases of Poverty
Suzy J Campbell, J Russell Stothard, Faye O'Halloran, Deborah Sankey, Timothy Durant, Dieudonné Eloundou Ombede, Gwladys Djomkam Chuinteu, Bonnie L Webster, Lucas Cunningham, E James LaCourse, Louis-Albert Tchuem-Tchuenté
BACKGROUND: The crater lakes of Barombi Mbo and Barombi Kotto are well-known transmission foci of schistosomiasis and soil-transmitted helminthiasis having had several important control initiatives previously. To collect contemporary epidemiological information, a cross-sectional survey was undertaken inclusive of: signs and symptoms of disease, individual treatment histories, local water, sanitation and hygiene (WASH)-related factors and malacological surveillance, with molecular characterisation of specimens...
February 27, 2017: Infectious Diseases of Poverty
Aly Younes, Hanaa El-Sherief, Fathia Gawish, Marwa Mahmoud
The water bug, Sphaerodema urinator (Hemiptera : Belostomatidae), shares the same habitat of the freshwater snails in ponds, lakes, and streams. Studies conducted in lakes show that fish and crayfish predators play an important role in determining the abundance of freshwater snails. In contrast, shallow ponds and marches often lack fish and crayfish but have abundant insect predators. This study has been carried out to evaluate the predatory potential of S. urinator adult on two freshwater snails that serves as intermediate hosts of Schistosoma...
April 2017: Parasitology Research
H Curtis Kariuki, Julianne A Ivy, Eric M Muchiri, Laura J Sutherland, Charles H King
AbstractSchistosoma haematobium infection causes urogenital schistosomiasis, a chronic inflammatory disease that is highly prevalent in many parts of sub-Saharan Africa. Bulinid snails are the obligate intermediate hosts in the transmission of this parasite. In the present study, Bulinus globosus and Bulinus nasutus snails from coastal Kenya were raised in the laboratory and exposed to miracidia derived from sympatric S. haematobium specimens to assess the species-specific impact of parasite contact and infection...
April 2017: American Journal of Tropical Medicine and Hygiene
Tom Pennance, Bobbie Person, Mtumweni Ali Muhsin, Alipo Naim Khamis, Juma Muhsin, Iddi Simba Khamis, Khalfan Abdallah Mohammed, Fatma Kabole, David Rollinson, Stefanie Knopp
BACKGROUND: Elimination of urogenital schistosomiasis transmission is a priority for the Zanzibar Ministry of Health. Preventative chemotherapy together with additional control interventions have successfully alleviated much of the disease burden. However, a persistently high Schistosoma haematobium prevalence is found in certain areas. Our aim was to characterise and evaluate these persistent "hot-spots" of transmission and reinfection in comparison with low-prevalence areas, to support the intervention planning for schistosomiasis elimination in Zanzibar...
December 16, 2016: Parasites & Vectors
Tawanda Manyangadze, Moses John Chimbari, Michael Gebreslasie, Pietro Ceccato, Samson Mukaratirwa
BACKGROUND: Schistosomiasis is a snail-borne disease endemic in sub-Saharan Africa transmitted by freshwater snails. The distribution of schistosomiasis coincides with that of the intermediate hosts as determined by climatic and environmental factors. The aim of this paper was to model the spatial and seasonal distribution of suitable habitats for Bulinus globosus and Biomphalaria pfeifferi snail species (intermediate hosts for Schistosoma haematobium and Schistosoma mansoni, respectively) in the Ndumo area of uMkhanyakude district, South Africa...
November 4, 2016: Parasites & Vectors
Martina R Laidemitt, Eva T Zawadzki, Sara V Brant, Martin W Mutuku, Gerald M Mkoji, Eric S Loker
Paramphistomoids are ubiquitous and widespread digeneans that infect a diverse range of definitive hosts, being particularly speciose in ruminants. We collected adult worms from cattle, goats and sheep from slaughterhouses, and cercariae from freshwater snails from ten localities in Central and West Kenya. We sequenced cox1 (690 bp) and internal transcribed region 2 (ITS2) (385 bp) genes from a small piece of 79 different adult worms and stained and mounted the remaining worm bodies for comparisons with available descriptions...
February 2017: Parasitology
Shawky M Aboelhadid, Marwa Thabet, Dayhoum El-Basel, Ragaa Taha
The present study aims to detect the digenetic larvae infections in Bulinus truncatus and Biomphalaria alexandrina snails and also PCR detection of Schistosoma mansoni infection. The snails were collected from different branches of Yousef canal and their derivatives in El Fayoum Governorate. The snails were investigated for infection through induction of cercarial shedding by exposure to light and crushing of the snails. The shed cercariae were S. mansoni, Pharyngeate longifurcate type I and Pharyngeate longifurcate type II from B...
September 2016: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
Abraham S H Breure, Valentín Mogollón Avila
A faunal overview is presented of the molluscan families Amphibulimidae, Megaspiridae, Odontostomidae, Orthalicidae, Simpulopsidae in Bolivia, Ecuador, and Peru. These Central Andean countries are known for their biodiverse malacofauna, of which the superfamily Orthalicoidea takes relatively a large share. In this paper the five families containing 103 (sub)species, for which systematic information (original publication, type locality, type depository, summarizing literature) and distributional records are presented...
2016: ZooKeys
Lwamkelekile Sitshilelo Mkize, Samson Mukaratirwa, Oliver Tendayi Zishiri
The freshwater snail Bulinus globosus is an important intermediate host of Schistosoma haematobium, the causative agent of urinary schistosomiasis. This disease is of major health concern, especially in Africa where the majority of cases have been reported. In this study the inter- and intra-genetic diversity and population genetic structure of B. globosus from nine locations in the KwaZulu-Natal province of South Africa was studied using four polymorphic microsatellite loci (BgZ1-BgZ4). Moderate genetic diversity was detected within populations with a mean diversity (HE) of 0...
September 2016: Acta Tropica
V B Moyo, W Changadeya, S Chiotha, D Sikawa
AIM: This study was designed to determine the prevalence of and risk factors for schistosomiasis among a group of preschool children in Malawi. Schistosomiasis burden among preschoolers in Malawi is not well documented in the literature. METHODS: This study used field research (in the form of a snail survey), laboratory work (urinalysis and microscopy for parasite identification), and questionnaire-guided interviews to determine the prevalence of and risk factors for urinary schistosomiasis among children, aged between 6 and 60 months, in Malengachanzi, Nkhotakota District, Malawi...
March 2016: Malawi Medical Journal: the Journal of Medical Association of Malawi
Jérôme Boissier, Sébastien Grech-Angelini, Bonnie L Webster, Jean-François Allienne, Tine Huyse, Santiago Mas-Coma, Eve Toulza, Hélène Barré-Cardi, David Rollinson, Julien Kincaid-Smith, Ana Oleaga, Richard Galinier, Joséphine Foata, Anne Rognon, Antoine Berry, Gabriel Mouahid, Rémy Henneron, Hélène Moné, Harold Noel, Guillaume Mitta
BACKGROUND: Schistosomiasis is a snail-borne parasitic disease endemic in several tropical and subtropical countries. However, in the summer of 2013, an unexpected outbreak of urogenital schistosomiasis occurred in Corsica, with more than 120 local people or tourists infected. We used a multidisciplinary approach to investigate the epidemiology of urogenital schistosomiasis in Corsica, aiming to elucidate the origin of the outbreak. METHODS: We did parasitological and malacological surveys at nine potential sites of infection...
August 2016: Lancet Infectious Diseases
Javier Perez-Saez, Theophile Mande, Natalie Ceperley, Enrico Bertuzzo, Lorenzo Mari, Marino Gatto, Andrea Rinaldo
We report about field and theoretical studies on the ecology of the aquatic snails (Bulinus spp. and Biomphalaria pfeifferi) that serve as obligate intermediate hosts in the complex life cycle of the parasites causing human schistosomiasis. Snail abundance fosters disease transmission, and thus the dynamics of snail populations are critically important for schistosomiasis modeling and control. Here, we single out hydrological drivers and density dependence (or lack of it) of ecological growth rates of local snail populations by contrasting novel ecological and environmental data with various models of host demography...
June 7, 2016: Proceedings of the National Academy of Sciences of the United States of America
Concillia Monde, Stephen Syampungani, Paul J Van den Brink
The effect of the pesticide endosulfan on predator-prey interactions between catfish and Schistosoma host snails was assessed in static tank experiments. Hybrid catfish (Clarias gariepinus × C. ngamensis) and Bulinus globosus were subjected to various endosulfan concentrations including an untreated control. The 48- and 96-h LC50 values for catfish were 1.0 and <0.5 µg/L, respectively, whereas the 48- and 96-h LC50 values for snails were 1137 and 810 µg/L. To assess sublethal effects on the feeding of the catfish on B...
August 2016: Archives of Environmental Contamination and Toxicology
F Tandina, S N Doumbo, A K Koné, D Guindo, S Goita, M Sissoko, S Konaté, A Dabo, O K Doumbo
OBJECTIVE: The objective of this work was to describe the epidemiology of schistosomiasis 10 years after mass administration of praziquantel began in Sotuba, Mali. METHODOLOGY/RESULTS: This observational cross-sectional survey in Sotuba, a periurban village in the Bamako district, took place from July to September 2010 and collected stool and urine samples from residents at least one year old. Kato-Katz (for stool) and urine filtration techniques were used to detect Schistosoma mansoni and S...
January 2016: Médecine et Santé Tropicales
Nidal A I Mohammed, Henry Madsen, Abdel Aziz A R M Ahmed
BACKGROUND: The planorbid freshwater snails of the two genera, Biomphalaria and Bulinus -have been vigorously studied due to the role they play as intermediate hosts of schistosomiasis. In Sudan specifically, most studies have focused on the chemical and ecological control of the two genera, but few studies have looked at their biological control. This study explored the coexistence of other species of freshwater snails and the two genera along with their trematode infections in relation to a number of environmental factors in the East Nile locality, Khartoum state, Sudan...
February 25, 2016: Infectious Diseases of Poverty
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