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A practical strategy for responding to a case of lymphatic filariasis post-elimination in Pacific Islands

Identifieur interne : 003937 ( Main/Exploration ); précédent : 003936; suivant : 003938

A practical strategy for responding to a case of lymphatic filariasis post-elimination in Pacific Islands

Auteurs : Humpress Harrington [Îles Salomon] ; James Asugeni [Îles Salomon] ; Christopher Jimuru [Îles Salomon] ; John Gwalaa [Îles Salomon] ; Elmer Ribeyro [Îles Salomon] ; Richard Bradbury [Gambie] ; Hayley Joseph [Australie] ; Wayne Melrose [Australie] ; David Maclaren [Australie] ; Rick Speare [Australie]

Source :

RBID : PMC:3726321

Descripteurs français

English descriptors

Abstract

Background

Lymphatic filariasis (LF) due to Wuchereria bancrofti is being eliminated from Oceania under the Pacific Elimination of Lymphatic Filariasis Programme. LF was endemic in Solomon Islands but in the 2010-2020 Strategic Plan of the Global Programme to Eliminate LF, Solomon Islands was listed as non-endemic for LF. In countries now declared free of LF an important question is what monitoring strategy should be used to detect any residual foci of LF?

This paper describes how a new case of elephantiasis in a post-elimination setting may be used as a trigger to initiate a local survey for LF.

Methods

The index case, a 44 year old male, presented to Atoifi Adventist Hospital, Malaita, Solomon Islands in April 2011 with elephantiasis of the lower leg. Persistent swelling had commenced 16 months previously. He was negative for antigen by TropBio Og4C3 ELISA and for microfilaria. A week later a survey of 197 people aged from 1 year to 68 years was conducted at Alasi, the index case’s village, by a research team from Atoifi Adventist Hospital and Atoifi College of Nursing. This represented 66.3% of the village population. Blood was collected between 22:00 and 03:00 by finger-prick and made into thick smears to detect microfilaria and collected onto filter paper for W. bancrofti antigen tests. A second group of 110 specimens was similarly collected from residents of the Hospital campus and inpatients. W. bancrofti antigen was tested for using the Trop-Bio Og4C3 test.

Results

One sample (1/307) from an 18 year old male from Alsai was positive for W. bancrofti antigen. No samples were positive for microfilaria. Although antigen-positivity indicated a live worm, the case was regarded as having been acquired some years previously.

Conclusions

We propose that when LF has been eliminated from a country, a case of elephantiasis should be a trigger to conduct a survey of the case’s community using a decision pathway. W. bancrofti antigen should be tested for with screening for microfilariae in antigen positive cases. The field survey was designed and conducted by local researchers, highlighting the value of local research capacity in remote areas.


Url:
DOI: 10.1186/1756-3305-6-218
PubMed: 23890320
PubMed Central: 3726321


Affiliations:


Links toward previous steps (curation, corpus...)


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<keywords scheme="KwdEn" xml:lang="en">
<term>Adolescent</term>
<term>Adult</term>
<term>Aged</term>
<term>Animals</term>
<term>Antigens, Helminth (blood)</term>
<term>Child</term>
<term>Child, Preschool</term>
<term>Data Collection</term>
<term>Disease Eradication</term>
<term>Elephantiasis, Filarial (epidemiology)</term>
<term>Elephantiasis, Filarial (parasitology)</term>
<term>Elephantiasis, Filarial (prevention & control)</term>
<term>Enzyme-Linked Immunosorbent Assay</term>
<term>Humans</term>
<term>Infant</term>
<term>Male</term>
<term>Microfilariae</term>
<term>Middle Aged</term>
<term>Pacific Islands (epidemiology)</term>
<term>Wuchereria bancrofti (immunology)</term>
<term>Wuchereria bancrofti (isolation & purification)</term>
<term>Young Adult</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr">
<term>Adolescent</term>
<term>Adulte</term>
<term>Adulte d'âge moyen</term>
<term>Animaux</term>
<term>Antigènes d'helminthe (sang)</term>
<term>Collecte de données</term>
<term>Enfant</term>
<term>Enfant d'âge préscolaire</term>
<term>Filariose lymphatique ()</term>
<term>Filariose lymphatique (parasitologie)</term>
<term>Filariose lymphatique (épidémiologie)</term>
<term>Humains</term>
<term>Iles du Pacifique (épidémiologie)</term>
<term>Jeune adulte</term>
<term>Microfilaria</term>
<term>Mâle</term>
<term>Nourrisson</term>
<term>Sujet âgé</term>
<term>Test ELISA</term>
<term>Wuchereria bancrofti (immunologie)</term>
<term>Wuchereria bancrofti (isolement et purification)</term>
<term>Éradication de maladie</term>
</keywords>
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<term>Antigens, Helminth</term>
</keywords>
<keywords scheme="MESH" qualifier="epidemiology" xml:lang="en">
<term>Elephantiasis, Filarial</term>
<term>Pacific Islands</term>
</keywords>
<keywords scheme="MESH" qualifier="immunologie" xml:lang="fr">
<term>Wuchereria bancrofti</term>
</keywords>
<keywords scheme="MESH" qualifier="immunology" xml:lang="en">
<term>Wuchereria bancrofti</term>
</keywords>
<keywords scheme="MESH" qualifier="isolation & purification" xml:lang="en">
<term>Wuchereria bancrofti</term>
</keywords>
<keywords scheme="MESH" qualifier="isolement et purification" xml:lang="fr">
<term>Wuchereria bancrofti</term>
</keywords>
<keywords scheme="MESH" qualifier="parasitologie" xml:lang="fr">
<term>Filariose lymphatique</term>
</keywords>
<keywords scheme="MESH" qualifier="parasitology" xml:lang="en">
<term>Elephantiasis, Filarial</term>
</keywords>
<keywords scheme="MESH" qualifier="prevention & control" xml:lang="en">
<term>Elephantiasis, Filarial</term>
</keywords>
<keywords scheme="MESH" qualifier="sang" xml:lang="fr">
<term>Antigènes d'helminthe</term>
</keywords>
<keywords scheme="MESH" qualifier="épidémiologie" xml:lang="fr">
<term>Filariose lymphatique</term>
<term>Iles du Pacifique</term>
</keywords>
<keywords scheme="MESH" xml:lang="en">
<term>Adolescent</term>
<term>Adult</term>
<term>Aged</term>
<term>Animals</term>
<term>Child</term>
<term>Child, Preschool</term>
<term>Data Collection</term>
<term>Disease Eradication</term>
<term>Enzyme-Linked Immunosorbent Assay</term>
<term>Humans</term>
<term>Infant</term>
<term>Male</term>
<term>Microfilariae</term>
<term>Middle Aged</term>
<term>Young Adult</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr">
<term>Adolescent</term>
<term>Adulte</term>
<term>Adulte d'âge moyen</term>
<term>Animaux</term>
<term>Collecte de données</term>
<term>Enfant</term>
<term>Enfant d'âge préscolaire</term>
<term>Filariose lymphatique</term>
<term>Humains</term>
<term>Jeune adulte</term>
<term>Microfilaria</term>
<term>Mâle</term>
<term>Nourrisson</term>
<term>Sujet âgé</term>
<term>Test ELISA</term>
<term>Éradication de maladie</term>
</keywords>
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<front>
<div type="abstract" xml:lang="en">
<sec>
<title>Background</title>
<p>Lymphatic filariasis (LF) due to
<italic>Wuchereria bancrofti</italic>
is being eliminated from Oceania under the Pacific Elimination of Lymphatic Filariasis Programme. LF was endemic in Solomon Islands but in the 2010-2020 Strategic Plan of the Global Programme to Eliminate LF, Solomon Islands was listed as non-endemic for LF. In countries now declared free of LF an important question is what monitoring strategy should be used to detect any residual foci of LF?</p>
<p>This paper describes how a new case of elephantiasis in a post-elimination setting may be used as a trigger to initiate a local survey for LF.</p>
</sec>
<sec>
<title>Methods</title>
<p>The index case, a 44 year old male, presented to Atoifi Adventist Hospital, Malaita, Solomon Islands in April 2011 with elephantiasis of the lower leg. Persistent swelling had commenced 16 months previously. He was negative for antigen by TropBio Og4C3 ELISA and for microfilaria. A week later a survey of 197 people aged from 1 year to 68 years was conducted at Alasi, the index case’s village, by a research team from Atoifi Adventist Hospital and Atoifi College of Nursing. This represented 66.3% of the village population. Blood was collected between 22:00 and 03:00 by finger-prick and made into thick smears to detect microfilaria and collected onto filter paper for
<italic>W. bancrofti</italic>
antigen tests. A second group of 110 specimens was similarly collected from residents of the Hospital campus and inpatients.
<italic>W. bancrofti</italic>
antigen was tested for using the Trop-Bio Og4C3 test.</p>
</sec>
<sec>
<title>Results</title>
<p>One sample (1/307) from an 18 year old male from Alsai was positive for
<italic>W. bancrofti</italic>
antigen. No samples were positive for microfilaria. Although antigen-positivity indicated a live worm, the case was regarded as having been acquired some years previously.</p>
</sec>
<sec>
<title>Conclusions</title>
<p>We propose that when LF has been eliminated from a country, a case of elephantiasis should be a trigger to conduct a survey of the case’s community using a decision pathway.
<italic>W. bancrofti</italic>
antigen should be tested for with screening for microfilariae in antigen positive cases. The field survey was designed and conducted by local researchers, highlighting the value of local research capacity in remote areas.</p>
</sec>
</div>
</front>
<back>
<div1 type="bibliography">
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</TEI>
<affiliations>
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<li>Australie</li>
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<li>Îles Salomon</li>
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<name sortKey="Ribeyro, Elmer" sort="Ribeyro, Elmer" uniqKey="Ribeyro E" first="Elmer" last="Ribeyro">Elmer Ribeyro</name>
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