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Mapping freshwater snails in north-western Angola: distribution, identity and molecular diversity of medically important taxa

2017-10Journal article Open access
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dc.contributor.authorAllan, Fiona
dc.contributor.authorSousa-Figueiredo, Jose Carlos
dc.contributor.authorEmery, Aidan M.
dc.contributor.authorPaulo, Rossely
dc.contributor.authorMirante, Clara
dc.contributor.authorSebastião, Alfredo
dc.contributor.authorBrito, Miguel
dc.contributor.authorRollinson, David
dc.date.accessioned2017-11-08T17:42:38Z
dc.date.available2017-11-08T17:42:38Z
dc.date.issued2017-10
dc.description.abstractBackground - 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. Methods - Snails were sampled from 60 water-contact points. Specimens of the genera Bulinus, Biomphalaria or Lymnaea were screened for trematode infections by inducing cercarial shedding. Snails were initially identified using shell morphology; subsequently a cytochrome c oxidase subunit 1 (cox1) gene fragment was amplified from a subset of snails from each site, for molecular identification. Cercariae were captured onto FTA cards for molecular analysis. Specimens of Bulinus angolensis collected from the original locality of the type specimen have been characterised and comparisons made with snails collected in 1957 held at the Natural History Museum, London, UK. Results - In total snails of nine genera were identified using morphological characteristics: Biomphalaria, Bulinus, Gyraulus, Lanistes, Lentorbis, Lymnaea, Melanoides, Physa and Succinea. Significant for schistosomiasis transmission, was the discovery of Bulinus globosus, B. canescens, B. angolensis, B. crystallinus and Biomphalaria salinarum in their type-localities and elsewhere. Bulinus globosus and B. angolensis occurred in two distinct geographical areas. The cox1 sequence for B. globosus differed markedly from those from specimens of this species collected from other countries. Bulinus angolensis is more closely related to B. globosus than originally documented and should be included in the B. africanus group. Schistosoma haematobium cercariae were recovered from B. globosus from two locations: Cabungo, Bengo (20 snails) and Calandula, Malanje (5 snails). Schistosoma haematobium cercariae were identified as group 1 cox1 corresponding to the type common throughout the African mainland. Conclusions - Various freshwater bodies in north-western Angola harbour potential intermediate snail hosts for urogenital schistosomiasis, highlighting the need to map the rest of the country to identify areas where transmission can occur and where control efforts should be targeted. The molecular phylogeny generated from the samples confirmed that considerable variation exists in B. globosus, which is the primary snail host for S. haematobium in many regions of Africa.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAllan F, Sousa-Figueiredo JC, Emery AM, Paulo R, Mirante C, Brito M, et al. Mapping freshwater snails in north-western Angola: distribution, identity and molecular diversity of medically important taxa. Parasit Vectors. 2017;10:460.pt_PT
dc.identifier.doi10.1186/s13071-017-2395-ypt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/7468
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherBioMed Centralpt_PT
dc.relation.publisherversionhttps://parasitesandvectors.biomedcentral.com/articles/10.1186/s13071-017-2395-ypt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectBiomphalaria spp.pt_PT
dc.subjectBulinus globosuspt_PT
dc.subjectSchistosoma haematobiumpt_PT
dc.subjectSchistosomiasis transmissionpt_PT
dc.subjectAngolapt_PT
dc.titleMapping freshwater snails in north-western Angola: distribution, identity and molecular diversity of medically important taxapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage460pt_PT
oaire.citation.titleParasites and Vectorspt_PT
oaire.citation.volume10pt_PT
person.familyNameBrito
person.givenNameMiguel
person.identifier.ciencia-id231F-F341-7E93
person.identifier.orcid0000-0001-6394-658X
person.identifier.ridA-7970-2016
person.identifier.scopus-author-id35224551000
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication4252d8e0-800c-4d67-8b13-0b711d860669
relation.isAuthorOfPublication.latestForDiscovery4252d8e0-800c-4d67-8b13-0b711d860669

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