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https://www.readbyqxmd.com/read/29239570/spatial-analysis-of-the-prevalence-of-schistosomiasis-in-an-endemic-coastal-area-in-north-eastern-brazil
#1
Allan D Santos, Jonhnatas Silva, Ana Caroline Lima, Márcio Santos, Shirley Lima, Monalisa Amor, Carlos Santos, Arthur Vasconcelos, Silvio Dolabella, Karina C G M Araújo
Due to contact and misuse of water drainage channels, schistosomiasis has spread and become a constant concern in northeastern Brazil. The aim of this study was to monitor human cases of Schistosomiasis mansoni and the breeding areas of the snail intermediate host Biomphalaria glabrata through spatial analysis in a community named Invasão do Canal do Guaxinim, located in Barra dos Coqueiros City in an endemic coastal part of the state of Sergipe, Brazil. This research was performed as a cross-sectional epidemiological study conducted with parasitological and malacological surveys...
November 27, 2017: Geospatial Health
https://www.readbyqxmd.com/read/29228974/central-nervous-system-transcriptome-of-biomphalaria-alexandrina-an-intermediate-host-for-schistosomiasis
#2
Tamer A Mansour, Mohamed R Habib, Laura C Vicente Rodríguez, Anthony Hernández Vázquez, Julián Maldonado Alers, Alfredo Ghezzi, Roger P Croll, C Titus Brown, Mark W Miller
OBJECTIVE: Globally, more than 200 million people live at risk of the neglected tropical disease schistosomiasis (or snail fever). Larval schistosomes require the presence of specific snail species that act as intermediate hosts, supporting their multiplication and transformation into forms that can infect humans. This project was designed to generate a transcriptome from the central nervous system (CNS) of Biomphalaria alexandrina, the major intermediate host for Schistosoma mansoni in Egypt...
December 11, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29196196/molluscicidal-activity-of-manilkara-subsericea-mart-dubard-on-biomphalaria-glabrata-say-1818
#3
Robson Xavier Faria, Leandro Machado Rocha, Eloísa Portugal Barros Silva Soares Souza, Fernanda Borges Almeida, Caio Pinho Fernandes, José Augusto Albuquerque Santos
Schistosomiasis is promoted for species from Schistosoma genus affecting over 200 million people worldwide. Molluscicides are an efficient method to control this disease, being able to reduce intermediate host snail Biomphalaria glabrata number. In function of resistance cases using niclosamide, natural products are promisors to discover new drugs. Manilkara subsericea is endemic to Brazilian sandbanks of Rio de Janeiro State and wide ranges of biological activities. However, there is no studies evaluating its effects as molluscicidal agent...
November 30, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29183853/toxicity-of-usnic-acid-from-cladonia-substellata-lichen-to-embryos-and-adults-of-biomphalaria-glabrata
#4
Hallysson D A Araújo, Luanna R S Silva, Williams N Siqueira, Caíque S M Fonseca, Nicácio H Silva, Ana M M A Melo, Mônica C B Martins, Vera L M Lima
This study reports the molluscicidal activity of usnic acid isolated from Cladonia substellata Vanio (lichen) on embryos at various stages of development and in adult mollusks of Biomphalaria glabrata. The toxicity of usnic acid was also evaluated through Artemia salina larvae mortality. Usnic acid was extracted with diethyl ether, isolated, purified, and its structure confirmed by analyzing the spectra of proton nuclear magnetic resonance. LC90 for 24hours of exposure were 1.62, 4.45, 5.36, and 4.49μgmL-1 for blastula, gastrula, trocophore, and veliger embryonic stages, respectively, and 3...
November 25, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29169384/assessing-s-mansoni-prevalence-in-biomphalaria-snails-in-the-gombe-ecosystem-of-western-tanzania-the-importance-of-dna-sequence-data-for-clarifying-species-identification
#5
Jared S Bakuza, Robert Gillespie, Gamba Nkwengulila, Aileen Adam, Elizabeth Kilbride, Barbara K Mable
BACKGROUND: Snails are essential for the transmission and maintenance of schistosomiasis in endemic areas, as they serve as intermediate hosts for schistosome parasites. A clear understanding of the snail species present, their local distribution and infection status is therefore a prerequisite for effective control of schistosomiasis. The purpose of this study was to establish the infection status and distribution of Schistosoma mansoni in snails in the Gombe area along the shores of Lake Tanganyika in western Tanzania, using both detection of cercarial shedding and molecular approaches...
November 23, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29166439/the-geographic-information-system-applied-to-study-schistosomiasis-in-pernambuco
#6
Verônica Santos Barbosa, Rodrigo Moraes Loyo, Ricardo José de Paula Souza E Guimarães, Constança Simões Barbosa
OBJECTIVE: Diagnose risk environments for schistosomiasis in coastal localities of Pernambuco using geoprocessing techniques. METHODS: A coproscopic and malacological survey were carried out in the Forte Orange and Serrambi areas. Environmental variables (temperature, salinity, pH, total dissolved solids and water fecal coliform dosage) were collected from Biomphalaria breeding sites or foci. The spatial analysis was performed using ArcGis 10.1 software, applying the kernel estimator, elevation map, and distance map...
2017: Revista de Saúde Pública
https://www.readbyqxmd.com/read/29137971/clearance-of-schistosome-parasites-by-resistant-genotypes-at-a-single-genomic-region-in-biomphalaria-glabrata-snails-involves-cellular-components-of-the-hemolymph
#7
Euan R O Allan, Benjamin Gourbal, Camila B Dores, Anais Portet, Christopher J Bayne, Michael S Blouin
Schistosomiasis is one of the most detrimental neglected tropical diseases. Controlling the spread of this parasitic illness requires effective sanitation, access to chemotherapeutic drugs, and control over populations of the freshwater snails, such as Biomphalaria glabrata, that are essential intermediate hosts for schistosomes. Effectively controlling this disease, while minimising ecological implications of such control, will require an extensive understanding of the immunological interactions between schistosomes and their molluscan intermediate hosts...
November 12, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/29127867/effects-of-ashes-from-a-brazilian-savanna-wildfire-on-water-soil-and-biota-an-ecotoxicological-approach
#8
Eduardo C Oliveira-Filho, Darlan Q Brito, Zelia M B Dias, Mayara S Guarieiro, Esther L Carvalho, Maria L Fascineli, Cintia C Niva, Cesar K Grisolia
Wildfire is very common in Brazilian savannas, and its effects on water, soil and aquatic/soil organisms are poorly understood. In this study, we observed the effects of fire, especially of ashes, on surface soil and subsurface water in a typical Brazilian savanna (Cerrado sensu strictu) for one year. Soil analyses (pH, organic matter content, potential acidity, K, Ca, Mg and P) and subsurface water analyses (NO(3-), PO4(3-) Mg(2+), Ca(2+) and K(+)) were assessed. We evaluated the ecotoxicological effects of ashes on three different endpoints and species, in fish Danio rerio (embryonic development), aquatic snail Biomphalaria glabrata (reproduction) and a soil species Enchytraeus sp...
November 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29107743/allelic-variation-partially-regulates-galactose-dependent-hydrogen-peroxide-release-from-circulating-hemocytes-of-the-snail-biomphalaria-glabrata
#9
Euan R O Allan, Michael S Blouin
Freshwater snails are the intermediate hosts for numerous parasitic worms that are detrimental to human and agricultural health. Understanding the immune responses of these snails could be vital for finding ways to block transmission of those parasites. Allelic variation in a recently discovered genomic region in the snail, Biomphalaria glabrata, influences their susceptibility to schistosomes. Here we tested whether genes in that region, termed the Guadeloupe Resistance Complex (GRC), are involved in recognition of common pathogen-associated molecules that have been shown to be stimulants of the hydrogen peroxide defense pathway...
October 28, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29097241/laboratory-assessment-of-divaricatic-acid-against-biomphalaria-glabrata-and-schistosoma-mansoni-cercariae
#10
H A M F Silva, W N Siqueira, J L F Sá, L R S Silva, M C B Martins, A L Aires, F F Amâncio, E C Pereira, M C P A Albuquerque, A M M A Melo, N H Silva
In this study, the molluscicidal and antiparasitic activities of divaricatic acid was evaluated, targeting the mollusc Biomphalaria glabrata and cercariae of the helminth Schistosoma mansoni. In addition, the environmental toxicity of divaricatic acid was assessed by bioassay using the microcrustacean Artemia salina. Divaricatic acid showed high toxicity against both adult snails (5μg/mL) and embryos (20μg/mL after 6h of exposure). Similar activity was observed in Schistosoma mansoni cercariae after only a short exposure time (10μg/mL after 30min of exposure)...
October 31, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29051762/specific-pathogen-recognition-by-multiple-innate-immune-sensors-in-an-invertebrate
#11
Guillaume Tetreau, Silvain Pinaud, Anaïs Portet, Richard Galinier, Benjamin Gourbal, David Duval
Detection of pathogens by all living organisms is the primary step needed to implement a coherent and efficient immune response. This implies a mediation by different soluble and/or membrane-anchored proteins related to innate immune receptors called PRRs (pattern-recognition receptors) to trigger immune signaling pathways. In most invertebrates, their roles have been inferred by analogy to those already characterized in vertebrate homologs. Despite the induction of their gene expression upon challenge and the presence of structural domains associated with the detection of pathogen-associated molecular patterns in their sequence, their exact role in the induction of immune response and their binding capacity still remain to be demonstrated...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29051434/comparative-analysis-between-ecotoxicity-of-nitrogen-phosphorus-and-potassium-based-fertilizers-and-their-active-ingredients
#12
Nathan de Castro Soares Simplício, Daphne Heloísa de Freitas Muniz, Fernanda Regina Moreira Rocha, Denis Cavalcanti Martins, Zélia Malena Barreira Dias, Bruno Pereira da Costa Farias, Eduardo Cyrino Oliveira-Filho
This study aimed to analyze the ecotoxicity of nitrogen-, phosphorus-, and potassium-based compounds to organisms of two different trophic levels in order to compare the toxic effect between high-purity substances and these substances as components of fertilizers. Dilutions were made with the fertilizers' potassium chloride, potassium nitrate, superphosphate, urea, and their equivalent reagents, to conduct assays to establish the acute lethal concentration for half of the population (LC50). Ten individuals of the benthic snail Biomphalaria glabrata and the fish Danio rerio were exposed to each concentration of tested compounds...
December 27, 2016: Toxics
https://www.readbyqxmd.com/read/29045404/transcriptomic-responses-of-biomphalaria-pfeifferi-to-schistosoma-mansoni-investigation-of-a-neglected-african-snail-that-supports-more-s-mansoni-transmission-than-any-other-snail-species
#13
Sarah K Buddenborg, Lijing Bu, Si-Ming Zhang, Faye D Schilkey, Gerald M Mkoji, Eric S Loker
BACKGROUND: Biomphalaria pfeifferi is highly compatible with the widespread human-infecting blood fluke Schistosoma mansoni and transmits more cases of this parasite to people than any other snail species. For these reasons, B. pfeifferi is the world's most important vector snail for S. mansoni, yet we know relatively little at the molecular level regarding the interactions between B. pfeifferi and S. mansoni from early-stage sporocyst transformation to the development of cercariae. METHODOLOGY/PRINCIPAL FINDINGS: We sought to capture a portrait of the response of B...
October 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29044043/nutrient-availability-modulates-both-host-and-parasite-life-histories-in-a-snail-trematode-interaction
#14
Gregory J Sandland, Katherine A Josephson
Host nutrient availability can have important life history consequences for hosts and their parasites. The responses of each participant within the association can vary extensively across host-parasite systems. In this paper, we outline the life history responses of the aquatic snail Biomphalaria glabrata and its trematode parasite Echinostoma caproni during host nutrient restriction. The onset of host starvation had rapid and strong effects on snail reproduction, significantly reducing egg output in control snails and eliminating egg production in infected individuals...
October 18, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29032768/molluscicidal-effect-of-achyranthes-aspera-l-amaranthaceae-aqueous-extract-on-adult-snails-of-biomphalaria-pfeifferi-and-lymnaea-natalensis
#15
Belayhun Mandefro, Seid Tiku Mereta, Yinebeb Tariku, Argaw Ambelu
BACKGROUND: Intestinal schistosomiasis caused by Schistosoma mansoni is a wide spread disease in most parts of Ethiopian highlands. Snail control is one major strategy in schistosomiasis control. The use of molluscicidal plant products is becoming interesting due to their environmental friendliness, accessibility and easy application. This research is aimed to evaluate the molluscicidal effect of Achyranthes aspera on Biomphalaria pfeifferi and Lymnaea natalensis snails, which are of great medical and veterinary importance in Ethiopia...
October 16, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/29017937/combined-treatment-of-biomphalaria-glabrata-infected-by-schistosoma-mansoni-with-oxamniquine-and-praziquantel-reproductive-histological-and-metabolic-aspects
#16
Rebecca Nespoli Lima, Paulo Marcos Zech Coelho, Ana Carolina A Mattos, Clélia Christina Mello Silva, Ronaldo de Carvalho Augusto, Ester Maria Mota, Samaly de Souza, Georgia Correa Atella, Suellen Silva Cabral, George Eduardo Gabriel Kluck, Marta Julia Faro
No abstract text is available yet for this article.
October 7, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/29017583/mapping-freshwater-snails-in-north-western-angola-distribution-identity-and-molecular-diversity-of-medically-important-taxa
#17
Fiona Allan, Jose Carlos Sousa-Figueiredo, Aidan M Emery, Rossely Paulo, Clara Mirante, Alfredo Sebastião, Miguel Brito, David Rollinson
BACKGROUND: This study was designed to determine the distribution and identity of potential intermediate snail hosts of Schistosoma spp. in Bengo, Luanda, Kwanza Norte and Malanje Provinces in north-western Angola. This is an area where infection with Schistosoma haematobium, causing urogenital schistosomiasis, is common but little is yet known about transmission of the disease. Angola has had a varied past with regard to disease control and is revitalising efforts to combat neglected tropical diseases...
October 10, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28994007/impact-of-moringa-oleifera-seed-aqueous-extract-on-some-biological-biochemical-and-histological-aspects-of-biomphalaria-alexandrina-snails
#18
Amina M Ibrahim, Aboelfetoh M Abdalla
Schistosomiasis is one of the neglected tropical diseases. It is a snail-borne trematode infection, and Biomphalaria alexandrina snails are the intermediate host of Schistosoma mansoni in Egypt. The objective of this study is to evaluate the molluscicidal activity of the aqueous seed extract of Moringa oleifera against B. alexandrina snails. The results showed that this aqueous extract was lethal for B. alexandrina snails (LC50 0.27 g/l; LC90 0.41 g/l). Exposure of snails to the sublethal concentrations of this aqueous extract caused a considerable reduction in survival rates and hatchability rates of eggs of these snails...
October 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28951760/a-new-technique-using-low-volumes-a-new-technique-to-assess-the-molluscicidal-activity-using-low-volumes
#19
José Augusto Albuquerque Santos, Viviane Paixão Cavalcante, Leonardo da Silva Rangel, João Claudio Vitória Atico Leite, Robson Xavier Faria
Schistosomiasis is a disease endemic in several states of Brazil. The population control of the transmitter mollusks is done with Bayluscide WP 70®, in the control programs. OMS preconize molluscicidal assays using Becker with 500 mL of final volume, restringing the number of natural products and synthetic drugs to be tested in function of high quantity of material necessary. A new technique to assess the toxic effects for Biomphalaria sp. is the purpose of this work, for developing adaptation for this aquatic organism, using a low volume of test solution in 24-well plates...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28832617/molluscicidal-activities-of-curcumin-nisin-polylactic-acid-nanoparticle-on-biomphalaria-pfeifferi
#20
Michael E Omobhude, Olajumoke A Morenikeji, Oyetunde T Oyeyemi
BACKGROUND: Snail intermediate host control is a widely canvassed strategy for schistosomiasis control in endemic countries. While there have been increasing studies on the search for potent molluscicides in the past years, the use of nanoparticulate agents as molluscicides is yet to gain wide attention. The aim of this study was to assess the molluscicidal potential of curcumin-nisin poly lactic acid (PLA) entrapped nanoparticle (CurNisNp) against Biomphalaria pfeifferi, a snail intermediate host for Schistosoma mansoni...
August 2017: PLoS Neglected Tropical Diseases
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