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Rapid integrated clinical survey to determine prevalence and co-distribution patterns of lymphatic filariasis and onchocerciasis in a Loa loa co-endemic area: the Angolan experience

2017-08Journal article Open access
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dc.contributor.authorBrito, Miguel
dc.contributor.authorPaulo, Rossely
dc.contributor.authorVan-Dunem, Pedro
dc.contributor.authorMartins, António
dc.contributor.authorUnnasch, Thomas R.
dc.contributor.authorNovak, Robert J.
dc.contributor.authorJacob, Benjamin
dc.contributor.authorStanton, Michelle C.
dc.contributor.authorMolyneux, David H.
dc.contributor.authorKelly-Hope, Louise A.
dc.date.accessioned2017-05-26T15:47:38Z
dc.date.available2017-05-26T15:47:38Z
dc.date.issued2017-08
dc.description.abstractThe Republic of Angola is a priority country for onchocerciasis and lymphatic filariasis (LF) elimination, however, the co-distribution of the filarial parasite Loa loa (loiasis) is a significant impediment, due to the risk of severe adverse events (SAEs) associated with ivermectin used in mass drug administration (MDA) campaigns. Angola has a high risk loiasis zone identified in Bengo Province where alternative interventions may need to be implemented; however, the presence and geographical overlap of the three filarial infections/diseases are not well defined. Therefore, this study conducted a rapid integrated filarial mapping survey based on readily identifiable clinical conditions of each disease in this risk zone to help determine prevalence and co-distribution patterns in a timely manner with limited resources. In total, 2007 individuals from 29 communities in five provincial municipalities were surveyed. Community prevalence estimates were determined by the rapid assessment procedure for loiasis (RAPLOA) and rapid epidemiological mapping of onchocerciasis (REMO) together with two questions on LF clinical manifestations (presence of lymphoedema, hydrocoele). Overall low levels of endemicity, with different overlapping distributions were found. Loiasis was found in 18 communities with a prevalence of 2.0% (31/1571), which contrasted to previous results defining the area as a high risk zone. Onchocerciasis prevalence was 5.3% (49/922) in eight communities, and LF prevalence was 0.4% for lymphoedema (8/2007) and 2.6% for hydrocoeles (20/761 males) in seven and 12 communities respectively. The clinical mapping survey method helped to highlight that all three filarial infections are present in this zone of Bengo Province. However, the significant difference in loiasis prevalence found between the past and this current survey suggests that further studies including serological and parasitological confirmation are required. This will help determine levels of infection and risk, understand the associations between clinical, serological and parasitological prevalence patterns, and better determine the most appropriate treatment strategies to reach onchocerciasis and LF elimination targets in the loiasis co-endemic areas. Our results also suggest that the utility of the earlier RAPLOA derived maps, based on surveys undertaken over a decade ago, are likely to be invalid given the extent of population movement and environmental change, particularly deforestation, and that fine scale micro-mapping is required to more precisely delineate the interventions required defined by these complex co-endemicities.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBrito M, Paulo R, Van-Dunem P, Martins A, Unnasch TR, Novak RJ, et al. Rapid integrated clinical survey to determine prevalence and co-distribution patterns of lymphatic filariasis and onchocerciasis in a Loa loa co-endemic area: the Angolan experience. Parasite Epidemiol Control. 2017;2(3):71-84.pt_PT
dc.identifier.doi10.1016/j.parepi.2017.05.001pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/7079
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S2405673117300156pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectFilariasispt_PT
dc.subjectLoiasispt_PT
dc.subjectLoa loapt_PT
dc.subjectTropical eye wormpt_PT
dc.subjectSevere adverse eventspt_PT
dc.subjectSAEspt_PT
dc.subjectOnchocerciasispt_PT
dc.subjectLymphatic filariasispt_PT
dc.subjectElephantiasispt_PT
dc.subjectMappingpt_PT
dc.subjectNodulespt_PT
dc.subjectHydrocoelept_PT
dc.subjectLymphoedemapt_PT
dc.subjectIvermectinpt_PT
dc.subjectRAPLOA, REMOpt_PT
dc.subjectNTDspt_PT
dc.subjectNeglected tropical diseasespt_PT
dc.subjectAngolapt_PT
dc.subjectSub-saharan Africapt_PT
dc.titleRapid integrated clinical survey to determine prevalence and co-distribution patterns of lymphatic filariasis and onchocerciasis in a Loa loa co-endemic area: the Angolan experiencept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage84pt_PT
oaire.citation.issue3pt_PT
oaire.citation.startPage71pt_PT
oaire.citation.titleParasite Epidemiology and Controlpt_PT
oaire.citation.volume2pt_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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