Survival of diurnally sub periodic Wuchereria bancrofti in Downsiomyia nivea (Diptera: Culicidae): a density dependent factor from Andaman & Nicobar Islands
Identifieur interne : 006400 ( Ncbi/Curation ); précédent : 006399; suivant : 006401Survival of diurnally sub periodic Wuchereria bancrofti in Downsiomyia nivea (Diptera: Culicidae): a density dependent factor from Andaman & Nicobar Islands
Auteurs : A. N. Shriram ; K. Krishnamoorthy ; P. VanamailSource :
- The Indian Journal of Medical Research [ 0971-5916 ] ; 2014.
Descripteurs français
- KwdFr :
- Animaux, Culicidae (parasitologie), Culicidae (pathogénicité), Filariose lymphatique (), Filariose lymphatique (parasitologie), Filariose lymphatique (transmission), Filariose lymphatique (épidémiologie), Humains, Inde (épidémiologie), Larve (parasitologie), Prévalence, Saisons, Vecteurs insectes (parasitologie), Vecteurs insectes (pathogénicité), Wuchereria bancrofti (pathogénicité).
- MESH :
- parasitologie : Culicidae, Filariose lymphatique, Larve, Vecteurs insectes.
- pathogénicité : Culicidae, Vecteurs insectes, Wuchereria bancrofti.
- épidémiologie : Filariose lymphatique, Inde.
- Animaux, Filariose lymphatique, Humains, Prévalence, Saisons.
- Wicri :
- geographic : Inde.
English descriptors
- KwdEn :
- Animals, Culicidae (parasitology), Culicidae (pathogenicity), Elephantiasis, Filarial (epidemiology), Elephantiasis, Filarial (parasitology), Elephantiasis, Filarial (prevention & control), Elephantiasis, Filarial (transmission), Humans, India (epidemiology), Insect Vectors (parasitology), Insect Vectors (pathogenicity), Larva (parasitology), Prevalence, Seasons, Wuchereria bancrofti (pathogenicity).
- MESH :
- geographic , epidemiology : India.
- epidemiology : Elephantiasis, Filarial.
- parasitology : Culicidae, Elephantiasis, Filarial, Insect Vectors, Larva.
- pathogenicity : Culicidae, Insect Vectors, Wuchereria bancrofti.
- prevention & control : Elephantiasis, Filarial.
- transmission : Elephantiasis, Filarial.
- Animals, Humans, Prevalence, Seasons.
Abstract
In India, diurnally sub periodic
The entomological data collected from Teressa Island, endemic for the diurnally sub periodic form of
Distribution patterns of microfilariae were found to be over dispersed in
Results indicate the operation of parasite density dependent mortality of vectors or parasite loss or combination of both. The present study with
Url:
PubMed: 24604052
PubMed Central: 3994733
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PMC:3994733Le document en format XML
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in <italic>Downsiomyia nivea</italic>
(Diptera: Culicidae): a density dependent factor from Andaman & Nicobar Islands</title>
<author><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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<author><name sortKey="Krishnamoorthy, K" sort="Krishnamoorthy, K" uniqKey="Krishnamoorthy K" first="K." last="Krishnamoorthy">K. Krishnamoorthy</name>
<affiliation><nlm:aff id="aff2"><italic>Vector Control Research Centre (ICMR), Puducherry, India</italic>
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<author><name sortKey="Vanamail, P" sort="Vanamail, P" uniqKey="Vanamail P" first="P." last="Vanamail">P. Vanamail</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Survival of diurnally sub periodic <italic>Wuchereria bancrofti</italic>
in <italic>Downsiomyia nivea</italic>
(Diptera: Culicidae): a density dependent factor from Andaman & Nicobar Islands</title>
<author><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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<author><name sortKey="Krishnamoorthy, K" sort="Krishnamoorthy, K" uniqKey="Krishnamoorthy K" first="K." last="Krishnamoorthy">K. Krishnamoorthy</name>
<affiliation><nlm:aff id="aff2"><italic>Vector Control Research Centre (ICMR), Puducherry, India</italic>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Vanamail, P" sort="Vanamail, P" uniqKey="Vanamail P" first="P." last="Vanamail">P. Vanamail</name>
<affiliation><nlm:aff id="aff2"><italic>Vector Control Research Centre (ICMR), Puducherry, India</italic>
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<series><title level="j">The Indian Journal of Medical Research</title>
<idno type="ISSN">0971-5916</idno>
<idno type="eISSN">0975-9174</idno>
<imprint><date when="2014">2014</date>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><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>
<term>Humans</term>
<term>India (epidemiology)</term>
<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>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><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>
<term>Prévalence</term>
<term>Saisons</term>
<term>Vecteurs insectes (parasitologie)</term>
<term>Vecteurs insectes (pathogénicité)</term>
<term>Wuchereria bancrofti (pathogénicité)</term>
</keywords>
<keywords scheme="MESH" type="geographic" qualifier="epidemiology" xml:lang="en"><term>India</term>
</keywords>
<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>
</keywords>
<keywords scheme="MESH" qualifier="pathogenicity" xml:lang="en"><term>Culicidae</term>
<term>Insect Vectors</term>
<term>Wuchereria bancrofti</term>
</keywords>
<keywords scheme="MESH" qualifier="pathogénicité" xml:lang="fr"><term>Culicidae</term>
<term>Vecteurs insectes</term>
<term>Wuchereria bancrofti</term>
</keywords>
<keywords scheme="MESH" qualifier="prevention & control" xml:lang="en"><term>Elephantiasis, Filarial</term>
</keywords>
<keywords scheme="MESH" qualifier="transmission" xml:lang="en"><term>Elephantiasis, Filarial</term>
</keywords>
<keywords scheme="MESH" qualifier="épidémiologie" xml:lang="fr"><term>Filariose lymphatique</term>
<term>Inde</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Animals</term>
<term>Humans</term>
<term>Prevalence</term>
<term>Seasons</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr"><term>Animaux</term>
<term>Filariose lymphatique</term>
<term>Humains</term>
<term>Prévalence</term>
<term>Saisons</term>
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<front><div type="abstract" xml:lang="en"><sec id="st1"><title>Background & objectives:</title>
<p>In India, diurnally sub periodic <italic>Wuchereria bancrofti</italic>
transmitted by <italic>Downsiomyia nivea</italic>
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 <italic>Do. nivea</italic>
.</p>
</sec>
<sec id="st2"><title>Methods:</title>
<p>The entomological data collected from Teressa Island, endemic for the diurnally sub periodic form of <italic>W. bancrofti</italic>
were used to examine the parasite loss and its survival up to infectivity. Patterns of parasite distribution in <italic>Do. nivea</italic>
were examined.</p>
</sec>
<sec id="st3"><title>Results:</title>
<p>Distribution patterns of microfilariae were found to be over dispersed in <italic>Do. nivea</italic>
. 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.</p>
</sec>
<sec id="st4"><title>Interpretation & conclusions:</title>
<p>Results indicate the operation of parasite density dependent mortality of vectors or parasite loss or combination of both. The present study with <italic>Aedes</italic>
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 <italic>Aedes</italic>
with <italic>Culex</italic>
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.</p>
</sec>
</div>
</front>
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