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Survival of diurnally sub periodic Wuchereria bancrofti in Downsiomyia nivea (Diptera: Culicidae): a density dependent factor from Andaman & Nicobar Islands.

Identifieur interne : 001636 ( PubMed/Curation ); précédent : 001635; suivant : 001637

Survival of diurnally sub periodic Wuchereria bancrofti in Downsiomyia nivea (Diptera: Culicidae): a density dependent factor from Andaman & Nicobar Islands.

Auteurs : A N Shriram [Inde] ; K. Krishnamoorthy ; P. Vanamail

Source :

RBID : pubmed:24604052

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Abstract

In India, diurnally sub periodic Wuchereria bancrofti transmitted by Downsiomyia nivea is prevalent only in the Nicobar district of Andaman and Nicobar Islands. The ongoing LF elimination programme aims at transmission interruption by bringing down the microfilarie (mf) load in the community, which has implication on the parasite load in mosquito vector. Therefore, understanding density dependent constraints on transmission assumes significance from control perspective. The present study was undertaken in Teressa Island to understand the density dependent parasite mortality and survival probability of the parasite Do. nivea.

PubMed: 24604052

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pubmed:24604052

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<title xml:lang="en">Survival of diurnally sub periodic Wuchereria bancrofti in Downsiomyia nivea (Diptera: Culicidae): a density dependent factor from Andaman & Nicobar Islands.</title>
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<name sortKey="Shriram, A N" sort="Shriram, A N" uniqKey="Shriram A" first="A N" last="Shriram">A N Shriram</name>
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<nlm:affiliation>Regional Medical Research Centre (ICMR), Port Blair, India.</nlm:affiliation>
<country xml:lang="fr">Inde</country>
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<name sortKey="Krishnamoorthy, K" sort="Krishnamoorthy, K" uniqKey="Krishnamoorthy K" first="K" last="Krishnamoorthy">K. Krishnamoorthy</name>
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<name sortKey="Shriram, A N" sort="Shriram, A N" uniqKey="Shriram A" first="A N" last="Shriram">A N Shriram</name>
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<term>Animals</term>
<term>Culicidae (parasitology)</term>
<term>Culicidae (pathogenicity)</term>
<term>Elephantiasis, Filarial (epidemiology)</term>
<term>Elephantiasis, Filarial (parasitology)</term>
<term>Elephantiasis, Filarial (prevention & control)</term>
<term>Elephantiasis, Filarial (transmission)</term>
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<term>Insect Vectors (parasitology)</term>
<term>Insect Vectors (pathogenicity)</term>
<term>Larva (parasitology)</term>
<term>Prevalence</term>
<term>Seasons</term>
<term>Wuchereria bancrofti (pathogenicity)</term>
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<term>Animaux</term>
<term>Culicidae (parasitologie)</term>
<term>Culicidae (pathogénicité)</term>
<term>Filariose lymphatique ()</term>
<term>Filariose lymphatique (parasitologie)</term>
<term>Filariose lymphatique (transmission)</term>
<term>Filariose lymphatique (épidémiologie)</term>
<term>Humains</term>
<term>Inde (épidémiologie)</term>
<term>Larve (parasitologie)</term>
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<term>Saisons</term>
<term>Vecteurs insectes (parasitologie)</term>
<term>Vecteurs insectes (pathogénicité)</term>
<term>Wuchereria bancrofti (pathogénicité)</term>
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<term>India</term>
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<keywords scheme="MESH" qualifier="epidemiology" xml:lang="en">
<term>Elephantiasis, Filarial</term>
</keywords>
<keywords scheme="MESH" qualifier="parasitologie" xml:lang="fr">
<term>Culicidae</term>
<term>Filariose lymphatique</term>
<term>Larve</term>
<term>Vecteurs insectes</term>
</keywords>
<keywords scheme="MESH" qualifier="parasitology" xml:lang="en">
<term>Culicidae</term>
<term>Elephantiasis, Filarial</term>
<term>Insect Vectors</term>
<term>Larva</term>
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<keywords scheme="MESH" qualifier="pathogenicity" xml:lang="en">
<term>Culicidae</term>
<term>Insect Vectors</term>
<term>Wuchereria bancrofti</term>
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<term>Culicidae</term>
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<term>Wuchereria bancrofti</term>
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<term>Filariose lymphatique</term>
<term>Inde</term>
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<term>Filariose lymphatique</term>
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<div type="abstract" xml:lang="en">In India, diurnally sub periodic Wuchereria bancrofti transmitted by Downsiomyia nivea is prevalent only in the Nicobar district of Andaman and Nicobar Islands. The ongoing LF elimination programme aims at transmission interruption by bringing down the microfilarie (mf) load in the community, which has implication on the parasite load in mosquito vector. Therefore, understanding density dependent constraints on transmission assumes significance from control perspective. The present study was undertaken in Teressa Island to understand the density dependent parasite mortality and survival probability of the parasite Do. nivea.</div>
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<Month>03</Month>
<Day>07</Day>
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<Month>04</Month>
<Day>02</Day>
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<DateRevised>
<Year>2015</Year>
<Month>05</Month>
<Day>15</Day>
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<ISSN IssnType="Print">0971-5916</ISSN>
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<Volume>139</Volume>
<Issue>1</Issue>
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<Month>Jan</Month>
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<Title>The Indian journal of medical research</Title>
<ISOAbbreviation>Indian J. Med. Res.</ISOAbbreviation>
</Journal>
<ArticleTitle>Survival of diurnally sub periodic Wuchereria bancrofti in Downsiomyia nivea (Diptera: Culicidae): a density dependent factor from Andaman & Nicobar Islands.</ArticleTitle>
<Pagination>
<MedlinePgn>167-73</MedlinePgn>
</Pagination>
<Abstract>
<AbstractText Label="BACKGROUND & OBJECTIVES" NlmCategory="OBJECTIVE">In India, diurnally sub periodic Wuchereria bancrofti transmitted by Downsiomyia nivea is prevalent only in the Nicobar district of Andaman and Nicobar Islands. The ongoing LF elimination programme aims at transmission interruption by bringing down the microfilarie (mf) load in the community, which has implication on the parasite load in mosquito vector. Therefore, understanding density dependent constraints on transmission assumes significance from control perspective. The present study was undertaken in Teressa Island to understand the density dependent parasite mortality and survival probability of the parasite Do. nivea.</AbstractText>
<AbstractText Label="METHODS" NlmCategory="METHODS">The entomological data collected from Teressa Island, endemic for the diurnally sub periodic form of W. bancrofti were used to examine the parasite loss and its survival up to infectivity. Patterns of parasite distribution in Do. nivea were examined.</AbstractText>
<AbstractText Label="RESULTS" NlmCategory="RESULTS">Distribution patterns of microfilariae were found to be over dispersed in Do. nivea. The later stages of the parasite in the vector were randomly distributed. Distribution pattern of various filarial larval stages suggested that the loss of parasites occurred as development progressed and was maximal between the first and second stages. Further, both the prevalence of infection and the degree of parasite aggregation in the vector population have fallen significantly with development of parasite stage.</AbstractText>
<AbstractText Label="INTERPRETATION & CONCLUSIONS" NlmCategory="CONCLUSIONS">Results indicate the operation of parasite density dependent mortality of vectors or parasite loss or combination of both. The present study with Aedes transmitted filariasis conducted before launching LF elimination programme in the study area indicates a comparable level of parasite regulation in the vector which has similar implications on the transmission threshold. Thus, the consideration of Aedes with Culex in deriving the critical level of antigen positive for making decisions on cessation of mass drug administration (MDA) can be justified. However, with MDA aiming at reducing parasite load in the community, the operation of density dependent factor in the transmission becomes less pronounced in the subsequent rounds of MDA.</AbstractText>
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<LastName>Shriram</LastName>
<ForeName>A N</ForeName>
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<CommentsCorrectionsList>
<CommentsCorrections RefType="Cites">
<RefSource>Parasitology. 1998 Mar;116 ( Pt 3):243-55</RefSource>
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<RefSource>J Med Entomol. 1973 Apr 25;10(2):189-93</RefSource>
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<RefSource>Trans R Soc Trop Med Hyg. 1976;70(1):39-48</RefSource>
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<PMID Version="1">15772320</PMID>
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