The geographical distribution of lymphatic filariasis infection in Malawi
Identifieur interne : 001B65 ( Pmc/Curation ); précédent : 001B64; suivant : 001B66The geographical distribution of lymphatic filariasis infection in Malawi
Auteurs : Bagrey Mm Ngwira [Royaume-Uni, Malawi] ; Phillimon Tambala [Malawi] ; A Maria Perez [Malawi] ; Cameron Bowie [Malawi] ; David H. Molyneux [Royaume-Uni]Source :
- Filaria Journal [ 1475-2883 ] ; 2007.
Abstract
Mapping distribution of lymphatic filariasis (LF) is a prerequisite for planning national elimination programmes. Results from a nation wide mapping survey for lymphatic filariasis (LF) in Malawi are presented. Thirty-five villages were sampled from 23 districts excluding three districts (Karonga, Chikwawa and Nsanje) that had already been mapped and Likoma, an Island, where access was not possible in the time frame of the survey. Antigenaemia prevalence [based on immunochromatographic card tests (ICT)] ranged from 0% to 35.9%. Villages from the western side of the country and distant from the lake tended to be of lower prevalence. The exception was a village in Mchinji district on the Malawi-Zambia border where a prevalence of 18.2% was found. In contrast villages from lake shore districts [Salima, Mangochi, Balaka and Ntcheu (Bwanje valley)] and Phalombe had prevalences of over 20%.
A national map is developed which incorporates data from surveys in Karonga, Chikwawa and Nsanje districts, carried out in 2000. There is a marked decline in prevalence with increasing altitude. Further analysis revealed a strong negative correlation (R2 = 0.7 p < 0.001) between altitude and prevalence. These results suggest that the lake shore, Phalombe plain and the lower Shire valley will be priority areas for the Malawi LF elimination programme. Implications of these findings as regards implementing a national LF elimination programme in Malawi are discussed.
Url:
DOI: 10.1186/1475-2883-6-12
PubMed: 18047646
PubMed Central: 2233609
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<front><div type="abstract" xml:lang="en"><p>Mapping distribution of lymphatic filariasis (LF) is a prerequisite for planning national elimination programmes. Results from a nation wide mapping survey for lymphatic filariasis (LF) in Malawi are presented. Thirty-five villages were sampled from 23 districts excluding three districts (Karonga, Chikwawa and Nsanje) that had already been mapped and Likoma, an Island, where access was not possible in the time frame of the survey. Antigenaemia prevalence [based on immunochromatographic card tests (ICT)] ranged from 0% to 35.9%. Villages from the western side of the country and distant from the lake tended to be of lower prevalence. The exception was a village in Mchinji district on the Malawi-Zambia border where a prevalence of 18.2% was found. In contrast villages from lake shore districts [Salima, Mangochi, Balaka and Ntcheu (Bwanje valley)] and Phalombe had prevalences of over 20%.</p>
<p>A national map is developed which incorporates data from surveys in Karonga, Chikwawa and Nsanje districts, carried out in 2000. There is a marked decline in prevalence with increasing altitude. Further analysis revealed a strong negative correlation (R<sup>2 </sup>
= 0.7 p < 0.001) between altitude and prevalence. These results suggest that the lake shore, Phalombe plain and the lower Shire valley will be priority areas for the Malawi LF elimination programme. Implications of these findings as regards implementing a national LF elimination programme in Malawi are discussed.</p>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">Filaria J</journal-id>
<journal-title>Filaria Journal</journal-title>
<issn pub-type="epub">1475-2883</issn>
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<article-id pub-id-type="doi">10.1186/1475-2883-6-12</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Research</subject>
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<title-group><article-title>The geographical distribution of lymphatic filariasis infection in Malawi</article-title>
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<contrib-group><contrib id="A1" corresp="yes" contrib-type="author"><name><surname>Ngwira</surname>
<given-names>Bagrey MM</given-names>
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<xref ref-type="aff" rid="I1">1</xref>
<xref ref-type="aff" rid="I2">2</xref>
<email>bngwira@africa-online.net</email>
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<contrib id="A2" contrib-type="author"><name><surname>Tambala</surname>
<given-names>Phillimon</given-names>
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<email>ief@malawi.net</email>
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<given-names>A Maria</given-names>
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<email>sgraham@mlw.medcol.mw</email>
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<contrib id="A4" contrib-type="author"><name><surname>Bowie</surname>
<given-names>Cameron</given-names>
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<email>cbowie@medcol.mw</email>
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<contrib id="A5" contrib-type="author"><name><surname>Molyneux</surname>
<given-names>David H</given-names>
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<email>david.molyneux@liv.ac.uk</email>
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<aff id="I1"><label>1</label>
Lymphatic Filariasis Support Centre, Liverpool School of Tropical Medicine, Pembroke Place, L3 5QA, UK</aff>
<aff id="I2"><label>2</label>
Malawi College of Medicine, P/Bag 360, Blantyre3, Malawi</aff>
<aff id="I3"><label>3</label>
Onchocerciasis Control Programme, PO Box 2273, Blantyre, Malawi</aff>
<pub-date pub-type="collection"><year>2007</year>
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<pub-date pub-type="epub"><day>29</day>
<month>11</month>
<year>2007</year>
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<volume>6</volume>
<fpage>12</fpage>
<lpage>12</lpage>
<ext-link ext-link-type="uri" xlink:href="http://www.filariajournal.com/content/6/1/12"></ext-link>
<history><date date-type="received"><day>17</day>
<month>4</month>
<year>2007</year>
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<date date-type="accepted"><day>29</day>
<month>11</month>
<year>2007</year>
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<permissions><copyright-statement>Copyright © 2007 Ngwira et al; licensee BioMed Central Ltd.</copyright-statement>
<copyright-year>2007</copyright-year>
<copyright-holder>Ngwira et al; licensee BioMed Central Ltd.</copyright-holder>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/2.0"><p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/2.0"></ext-link>
), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</p>
<pmc-comment>
Ngwira
MM
Bagrey
bngwira@africa-online.net
The geographical distribution of lymphatic filariasis infection in Malawi
2007 Filaria Journal 6(1): 12-. (2007) 1475-2883(2007)6:1<12> urn:ISSN:1475-2883 </pmc-comment>
</license>
</permissions>
<abstract><p>Mapping distribution of lymphatic filariasis (LF) is a prerequisite for planning national elimination programmes. Results from a nation wide mapping survey for lymphatic filariasis (LF) in Malawi are presented. Thirty-five villages were sampled from 23 districts excluding three districts (Karonga, Chikwawa and Nsanje) that had already been mapped and Likoma, an Island, where access was not possible in the time frame of the survey. Antigenaemia prevalence [based on immunochromatographic card tests (ICT)] ranged from 0% to 35.9%. Villages from the western side of the country and distant from the lake tended to be of lower prevalence. The exception was a village in Mchinji district on the Malawi-Zambia border where a prevalence of 18.2% was found. In contrast villages from lake shore districts [Salima, Mangochi, Balaka and Ntcheu (Bwanje valley)] and Phalombe had prevalences of over 20%.</p>
<p>A national map is developed which incorporates data from surveys in Karonga, Chikwawa and Nsanje districts, carried out in 2000. There is a marked decline in prevalence with increasing altitude. Further analysis revealed a strong negative correlation (R<sup>2 </sup>
= 0.7 p < 0.001) between altitude and prevalence. These results suggest that the lake shore, Phalombe plain and the lower Shire valley will be priority areas for the Malawi LF elimination programme. Implications of these findings as regards implementing a national LF elimination programme in Malawi are discussed.</p>
</abstract>
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