The association between microfilaraemia and disease in lymphatic filariasis.
Identifieur interne : 005563 ( PubMed/Corpus ); précédent : 005562; suivant : 005564The association between microfilaraemia and disease in lymphatic filariasis.
Auteurs : E. Michael ; B T Grenfell ; D A BundySource :
- Proceedings. Biological sciences [ 0962-8452 ] ; 1994.
English descriptors
- KwdEn :
- Animals, Brugia malayi (isolation & purification), Elephantiasis, Filarial (blood), Elephantiasis, Filarial (parasitology), Female, Humans, Lymphedema (parasitology), Male, Microfilariae (isolation & purification), Testicular Hydrocele (parasitology), Wuchereria bancrofti (isolation & purification).
- MESH :
- blood : Elephantiasis, Filarial.
- isolation & purification : Brugia malayi, Microfilariae, Wuchereria bancrofti.
- parasitology : Elephantiasis, Filarial, Lymphedema, Testicular Hydrocele.
- Animals, Female, Humans, Male.
Abstract
A standard tenet in the epidemiology of lymphatic filariasis is that patent infection is negatively related to chronic disease. We examine the empirical evidence for this relation by using published data from field studies carried out in a variety of bancroftian filariasis endemic areas. Meta-analysis of the individual study results for each disease category of hydrocele in males only, lymphoedema only, and both conditions combined (total chronic disease) indicate, contrary to expectation, no evidence for a negative association between infection and disease. Indeed, the trend of the empirical evidence is towards the opposite direction, with the majority of studies showing equal propensity of disease in microfilaraemics (mf+ves) and amicrofilaraemics (mf-ves), and more studies indicating a positive rather than a negative relation. There was also a trend for more positive studies for hydrocele compared to lymphoedema. Theoretical analysis suggests that between-study differences in blood sample volumes are unlikely to confound this finding. Analysis of between-study heterogeneity suggests that variations in the local incidence or prevalence of infection rather than unique geographical, including vector, differences might underlie the observed between-study variability in the microfilaraemia-disease association. These results are discussed in terms of dynamic explanations for infection-disease relations in lymphatic filariasis.
DOI: 10.1098/rspb.1994.0045
PubMed: 8008755
Links to Exploration step
pubmed:8008755Le document en format XML
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<author><name sortKey="Michael, E" sort="Michael, E" uniqKey="Michael E" first="E" last="Michael">E. Michael</name>
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<author><name sortKey="Grenfell, B T" sort="Grenfell, B T" uniqKey="Grenfell B" first="B T" last="Grenfell">B T Grenfell</name>
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<author><name sortKey="Bundy, D A" sort="Bundy, D A" uniqKey="Bundy D" first="D A" last="Bundy">D A Bundy</name>
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<term>Brugia malayi (isolation & purification)</term>
<term>Elephantiasis, Filarial (blood)</term>
<term>Elephantiasis, Filarial (parasitology)</term>
<term>Female</term>
<term>Humans</term>
<term>Lymphedema (parasitology)</term>
<term>Male</term>
<term>Microfilariae (isolation & purification)</term>
<term>Testicular Hydrocele (parasitology)</term>
<term>Wuchereria bancrofti (isolation & purification)</term>
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<keywords scheme="MESH" qualifier="blood" xml:lang="en"><term>Elephantiasis, Filarial</term>
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<keywords scheme="MESH" qualifier="isolation & purification" xml:lang="en"><term>Brugia malayi</term>
<term>Microfilariae</term>
<term>Wuchereria bancrofti</term>
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<keywords scheme="MESH" qualifier="parasitology" xml:lang="en"><term>Elephantiasis, Filarial</term>
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<term>Testicular Hydrocele</term>
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<front><div type="abstract" xml:lang="en">A standard tenet in the epidemiology of lymphatic filariasis is that patent infection is negatively related to chronic disease. We examine the empirical evidence for this relation by using published data from field studies carried out in a variety of bancroftian filariasis endemic areas. Meta-analysis of the individual study results for each disease category of hydrocele in males only, lymphoedema only, and both conditions combined (total chronic disease) indicate, contrary to expectation, no evidence for a negative association between infection and disease. Indeed, the trend of the empirical evidence is towards the opposite direction, with the majority of studies showing equal propensity of disease in microfilaraemics (mf+ves) and amicrofilaraemics (mf-ves), and more studies indicating a positive rather than a negative relation. There was also a trend for more positive studies for hydrocele compared to lymphoedema. Theoretical analysis suggests that between-study differences in blood sample volumes are unlikely to confound this finding. Analysis of between-study heterogeneity suggests that variations in the local incidence or prevalence of infection rather than unique geographical, including vector, differences might underlie the observed between-study variability in the microfilaraemia-disease association. These results are discussed in terms of dynamic explanations for infection-disease relations in lymphatic filariasis.</div>
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<ArticleTitle>The association between microfilaraemia and disease in lymphatic filariasis.</ArticleTitle>
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<Abstract><AbstractText>A standard tenet in the epidemiology of lymphatic filariasis is that patent infection is negatively related to chronic disease. We examine the empirical evidence for this relation by using published data from field studies carried out in a variety of bancroftian filariasis endemic areas. Meta-analysis of the individual study results for each disease category of hydrocele in males only, lymphoedema only, and both conditions combined (total chronic disease) indicate, contrary to expectation, no evidence for a negative association between infection and disease. Indeed, the trend of the empirical evidence is towards the opposite direction, with the majority of studies showing equal propensity of disease in microfilaraemics (mf+ves) and amicrofilaraemics (mf-ves), and more studies indicating a positive rather than a negative relation. There was also a trend for more positive studies for hydrocele compared to lymphoedema. Theoretical analysis suggests that between-study differences in blood sample volumes are unlikely to confound this finding. Analysis of between-study heterogeneity suggests that variations in the local incidence or prevalence of infection rather than unique geographical, including vector, differences might underlie the observed between-study variability in the microfilaraemia-disease association. These results are discussed in terms of dynamic explanations for infection-disease relations in lymphatic filariasis.</AbstractText>
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<MeshHeading><DescriptorName UI="D017178" MajorTopicYN="N">Brugia malayi</DescriptorName>
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<MeshHeading><DescriptorName UI="D004605" MajorTopicYN="N">Elephantiasis, Filarial</DescriptorName>
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<MeshHeading><DescriptorName UI="D006848" MajorTopicYN="N">Testicular Hydrocele</DescriptorName>
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<MeshHeading><DescriptorName UI="D014958" MajorTopicYN="N">Wuchereria bancrofti</DescriptorName>
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