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https://www.readbyqxmd.com/read/28204958/biological-control-of-snail-hosts-transmitting-schistosomiasis-by-the-water-bug-sphaerodema-urinator
#1
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...
February 15, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28162096/intestinal-schistosomiasis-in-uganda-at-high-altitude-1400%C3%A2-m-malacological-and-epidemiological-surveys-on-mount-elgon-and-in-fort-portal-crater-lakes-reveal-extra-preventive-chemotherapy-needs
#2
Michelle C Stanton, Moses Adriko, Moses Arinaitwe, Alison Howell, Juliet Davies, Gillian Allison, E James LaCourse, Edridah Muheki, Narcis B Kabatereine, J Russell Stothard
BACKGROUND: Intestinal schistosomiasis is of public health importance in Uganda but communities living above 1400 m are not targeted for control as natural transmission is thought unlikely. To assess altitudinal boundaries and at-risk populations, conjoint malacological and epidemiological surveys were undertaken on Mount Elgon (1139 m-3937 m), in Fort Portal crater lakes and in the Rwenzori Mountains (1123 m-4050 m). METHODS: Seventy freshwater habitats [Mount Elgon (37), Fort Portal crater lakes (23), Rwenzori Mountains (8) and Lake Albert (2)] were inspected for Biomphalaria species...
February 6, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28158185/schistosome-infectivity-in-the-snail-biomphalaria-glabrata-is-partially-dependent-on-the-expression-of-grctm6-a-guadeloupe-resistance-complex-protein
#3
Euan R O Allan, Jacob A Tennessen, Stephanie R Bollmann, Patrick C Hanington, Christopher J Bayne, Michael S Blouin
Schistosomiasis is one of the most important neglected tropical diseases. Despite effective chemotherapeutic treatments, this disease continues to afflict hundreds of millions of people. Understanding the natural intermediate snail hosts of schistosome parasites is vital to the suppression of this disease. A recently identified genomic region in Caribbean Biomphalaria glabrata snails strongly influences their resistance to infection by Schistosoma mansoni. This region contains novel genes having structural similarity to known pathogen recognition proteins...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28146171/urban-transmission-of-schistosomiasis-new-epidemiological-situation-in-the-forest-area-of-pernambuco
#4
Elainne Christine de Souza Gomes, Millena Carla da Silva Mesquita, Vitorina Nerivânia Covello Rehn, Wheverton Ricardo Correia do Nascimento, Rodrigo Loyo, Constança Simões Barbosa
Introduction: Schistosomiasis is considered an endemic disease in Vitória de Santo Antão, Pernambuco, a district which has presented both high incidence and prevalence of it for decades. Poor environmental conditions lead to contamination of water sources in rural areas, which are used by the population during daily activities, resulting in typical transmission. Recently, there has been evidence of vector snails in urban areas, which could set a new model for schistosomiasis transmission in this district...
October 2016: Revista Brasileira de Epidemiologia, Brazilian Journal of Epidemiology
https://www.readbyqxmd.com/read/28012902/first-characterization-of-viruses-from-freshwater-snails-of-the-genus-biomphalaria-the-intermediate-host-of-the-parasite-schistosoma-mansoni
#5
Richard Galinier, Guillaume Tetreau, Anaïs Portet, Silvain Pinaud, David Duval, Benjamin Gourbal
We report the genome sequence and organization of five viruses infecting snails of both Biomphalaria glabrata and Biomphalaria pfeifferi, which are vectors of the intestinal schistosomiasis. Four viruses presented a polyadenylated positive single strand RNA genome encoding one or two large open reading frames (ORFs) flanked by untranslated region. Conserved protein motifs typical of the picorna-like virus superfamily were identified in these viruses but they all presented different genome organization. Phylogenetic analysis confirmed their assignment to this superfamily...
March 2017: Acta Tropica
https://www.readbyqxmd.com/read/27941967/biompha-lamp-a-new-rapid-loop-mediated-isothermal-amplification-assay-for-detecting-schistosoma-mansoni-in-biomphalaria-glabrata-snail-host
#6
Javier Gandasegui, Pedro Fernández-Soto, Juan Hernández-Goenaga, Julio López-Abán, Belén Vicente, Antonio Muro
BACKGROUND: Schistosomiasis remains one of the most common endemic parasitic diseases affecting over 230 million people worlwide. Schistosoma mansoni is the main species causing intestinal and hepatic schistosomiasis and the fresh water pulmonate snails of the genus Biomphalaria are best known for their role as intermediate hosts of the parasite. The development of new molecular monitoring assays for large-scale screening of snails from transmission sites to detect the presence of schistosomes is an important point to consider for snail control interventions related to schistosomiasis elimination...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27903067/predicting-the-spatial-distribution-of-biomphalaria-straminea-a-potential-intermediate-host-for-schistosoma-mansoni-in-china
#7
Mohamed R Habib, Yun-Hai Guo, Shan Lv, Wen-Biao Gu, Xiao-Heng Li, Xiao-Nong Zhou
Schistosomiasis is one of the most prevalent parasitic diseases impacting human health in the tropics and sub-tropics. The geographic distribution of Schistosoma mansoni, the most widespread species, includes areas in Africa, the Middle East, South America and the Caribbean. Snails of the genus Biomphalaria act as intermediate host for S. mansoni. Biomphalaria straminea is not indigenous in China but was accidentally introduced to Hong Kong from South America and has spread to other habitats in the southern parts of the country...
November 29, 2016: Geospatial Health
https://www.readbyqxmd.com/read/27903064/modelling-of-the-distribution-of-biomphalaria-glabrata-and-biomphalaria-straminea-in-the-metropolitan-region-of-recife-pernambuco-brazil
#8
Verônica Santos Barbosa, Ricardo José de Paula Souza E Guimarães, Rodrigo Moraes Loyo, Constança Simões Barbosa
The occurrence of schistosomiasis is directly linked to the presence of its snail intermediate host Biomphalaria spp. Knowledge of geographical distribution, habitats and behaviour of these snails in relation to the climate is essential for guiding measures for disease prevention and control. This study aims to model the distribution of B. glabrata and B. straminea in schistosomiasis non-endemic areas of the metropolitan region of Recife (MRR) based on environmental data and estimates of snail distributions in endemic and neighbouring areas...
November 25, 2016: Geospatial Health
https://www.readbyqxmd.com/read/27819717/wnt7b-gene-expression-and-functional-analysis-in-the-mussel-mytilus-coruscus
#9
Y F Xu, X Liang, Y R Chen, Y F Li, J L Yang
To understand the potential functions of Wnt7b in different developmental stages and adult tissues of the mussel Mytilus coruscus, the Wnt7b gene was cloned using the rapid amplification of cDNA ends technique. The full-length Wnt7b gene was 1910 bp long, with a 1059-bp open reading frame encoding 352 amino acids. The amino acid sequence of the M. coruscus Wnt7b gene shared high homology with that of Homo sapiens (59%), Mus musculus (61%), Danio rerio (61% similarity), Biomphalaria glabrata (62% similarity), Aplysia californica (66% similarity), and Crassostrea gigas (74%)...
November 3, 2016: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/27814746/modelling-the-spatial-and-seasonal-distribution-of-suitable-habitats-of-schistosomiasis-intermediate-host-snails-using-maxent-in-ndumo-area-kwazulu-natal-province-south-africa
#10
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
https://www.readbyqxmd.com/read/27793108/deep-multi-stage-transcriptome-of-the-schistosomiasis-vector-biomphalaria-glabrata-provides-platform-for-understanding-molluscan-disease-related-pathways
#11
Nathan J Kenny, Marta Truchado-García, Cristina Grande
BACKGROUND: The gastropod mollusc Biomphalaria glabrata is well known as a vector for the tropical disease schistosomiasis, which affects nearly 200 million people worldwide. Despite intensive study, our understanding of the genetic basis of B. glabrata development, growth and disease resistance is constrained by limited genetic resources, constraints for which next-generation sequencing methods provide a ready solution. METHODS: Illumina sequencing and de novo assembly using the Trinity program was used to generate a high-quality transcriptomic dataset spanning the entirety of in ovo development in schistosomiasis-free B...
October 28, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27762185/loads-of-trematodes-discovering-hidden-diversity-of-paramphistomoids-in-kenyan-ruminants
#12
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
https://www.readbyqxmd.com/read/27743973/the-influence-of-angiostrongylus-cantonensis-nematoda-metastrongylidae-infection-on-the-aerobic-metabolism-of-biomphalaria-straminea-and-biomphalaria-tenagophila-mollusca-gastropoda
#13
Mariana G Lima, Vinícius M Tunholi-Alves, Fabrício N Gaudêncio, Florence G Martins, Rosane N Castro, Silvana C Thiengo, Juberlan S Garcia, Arnaldo Maldonado, Jairo Pinheiro
Angiostrongylus cantonensis is considered the main agent responsible for human eosinophilic meningoencephalitis. This parasite has low specificity for mollusk hosts and it can also use aquatic snails as auxiliary hosts. Studies based on the metabolic profile of Biomphalaria spp. infected by A. cantonensis have been conducted to observe parasite-host interactions. In the present study, the glucose content in the hemolymph and glycogen content in the digestive gland and cephalopedal mass of Biomphalaria tenagophila and Biomphalaria straminea experimentally infected by A...
December 2016: Experimental Parasitology
https://www.readbyqxmd.com/read/27683811/assessment-of-the-impact-of-changes-in-temperature-in-biomphalaria-glabrata-say-1818-melanic-and-albino-variants-infected-with-schistosoma-mansoni-sambon-1907
#14
E A F Camargo, J T F Camargo, M F Neves, L F Simões, L A D Bastos, L A Magalhães, E M Zanotti-Magalhães
Fluctuations in population density of planorbid hosts of S. mansoni are influenced by climatic factors. The knowledge about interference from changes in water temperature in these populations is an important aspect of the epidemiology of schistosomiasis. In this experiment, it is explored the influence of different temperatures on the development of Schistosoma mansoni in Biomphalaria glabrata melanic and albino variants. The results indicated an intrinsic relationship between temperature and development of the parasite in the intramollusc phase, independent of the pigmentation of the mantle of the molluscs...
September 26, 2016: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/27683809/susceptibility-of-biomphalaria-glabrata-submitted-to-concomitant-infection-with-angiostrongylus-costaricensis-and-schistosoma-mansoni
#15
L R Guerino, J F Carvalho, L A Magalhães, E M Zanotti-Magalhães
The easy adaptation of Angiostrongylus costaricensis, nematode responsible for abdominal angiostrongyliasis to several species of terrestrial and freshwater molluscs and the differences observed in the interactions of trematodes with their intermediate hosts have induced us to study the concomitant infection of Biomphalaria glabrata with Schistosoma mansoni and A. costaricensis. Prior exposure of B. glabrata to A. costaricensis (with an interval of 48 hours), favored the development of S. mansoni, observing higher infection rate, increased release of cercariae and increased survival of molluscs, when compared to molluscs exposed only to S...
September 26, 2016: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/27683807/host-parasite-relationship-between-biomphalaria-amazonica-paraense-1966-and-schistosoma-mansoni-sambon-1907
#16
L F Simões, L D B Bastos, E A F Camargo, M F Neves, A X Linhares, L A Magalhães, E M Zanotti-Magalhães
Biomphalaria amazonica is a planorbid species considered a potential host of Schistosoma mansoni. It is widely distributed in the Neotropical zone, particularly in the North and Centre-West of Brazil and in the North of Bolivia. The aim of the present study was to determine the host-parasite relationship between B. amazonica and S. mansoni (BH and SJ strains). Specimens of B. amazonica and their snail-conditioned water were examined in terms of their ability to attract miracidia. The infectivity of the mollusks was determined by exposing them to 20 miracidia of both strains...
September 26, 2016: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/27637225/evaluating-the-risk-of-schistosoma-mansoni-transmission-in-mainland-china
#17
Guoli Qu, Wei Wang, Xiaomin Lu, Jianrong Dai, Xiaoheng Li, Yousheng Liang
Biomphalaria straminea, an intermediate host of Schistosoma mansoni, is predominantly distributed in the South Americas and Caribbean; however, this snail, as an invasive species, was introduced to Shenzhen, southern China, in 1981, and recent epidemiologic surveys demonstrate that the distribution of B. straminea has expanded across the Zhujiang River Basin, South China. In the presence of continuous importation of S. mansoni-infected cases, there is a growing concern about the transmission of S. mansoni in China...
December 2016: Parasitology Research
https://www.readbyqxmd.com/read/27605788/molecular-approach-for-detecting-early-prepatent-schistosoma-mansoni-infection-in-biomphalaria-alexandrina-snail-host
#18
Adel Farghaly, Ayman A Saleh, Soad Mahdy, Dalia Abd El-Khalik, Naglaa F Abd El-Aal, Sara A Abdel-Rahman, Marwa A Salama
The present study aimed to evaluate a polymerase chain reaction (PCR) assay used for detection of Schistosoma mansoni infection in Biomphalaria alexandrina snails in early prepatent period and to compare between it and the ordinary detection methods (shedding and crushing). Biomphalaria alexandrina snails are best known for their role as intermediate hosts of S. mansoni. DNA was extracted from infected snails in addition to non-infected "negative control" (to optimized the efficiency of PCR reaction) and subjected to PCR using primers specific to a partial sequence of S...
September 2016: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/27605774/digenetic-larvae-in-schistosome-snails-from-el-fayoum-egypt-with-detection-of-schistosoma-mansoni-in-the-snail-by-pcr
#19
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
https://www.readbyqxmd.com/read/27599101/changes-in-energetic-metabolism-of-biomphalaria-glabrata-mollusca-planorbidae-in-response-to-exogenous-calcium
#20
L D Silva, V C S Amaral, M C Vinaud, A M Castro, H H A Rezende, D B Santos, C C Mello-Silva, J C B Bezerra
Calcium is considered an essential element for the metabolism of aquatic snail Biomphalaria glabrata (Say, 1818), intermediate host of Schistosoma mansoni Sambon, 1907 in Brazil, and represents a limiting factor to its distribution and adaptation to the environment. This study investigated the effect of different concentrations of exogenous CaCO3 on the energetic metabolism of B. glabrata for better understanding the physiological interference of chemical elements dissolved in the environment with the physiology of this species...
September 5, 2016: Brazilian Journal of Biology, Revista Brasleira de Biologia
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