Evidence map›Paper›PMID 39923091›Full record

ArticleInfectious diseases of poverty2025

Association between Loa loa microfilaremia and anatomical hyposplenia in a rural area of the Republic of Congo: a population-based cross-sectional study.

Charlotte Boullé, Elodie Lebredonchel, Jérémy T Campillo, Valentin Dupasquier, Marlhand C Hemilembolo, Sébastien D S Pion, Jean Claude Djontu, Ludovic Rancé, Philippe Souteyrand, François Missamou and 3 more

Abstract read
In one paragraph

Article in Infectious diseases of poverty, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.

0numbers the graph read from it
0cells of the map it votes in
2citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

2 citing papers in PubMed.

  1. Article
  2. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors.

Charlotte Boullé *TransVIHMI, University of Montpellier, Inserm (National Institute of Health and Medical Research) Unité 1175, French National Research Institute for Sustainable Development (IRD), Montpellier, France. c-boulle@chu-montpellier.fr.ORCID http://orcid.org/0000-0002-3800-6315
Elodie Lebredonchel *Department of Biochemistry, Paris Nord Val de Seine University Hospital-Bichat, Public Hospitals of Paris, Paris, France.
Jérémy T Campillo *TransVIHMI, University of Montpellier, Inserm (National Institute of Health and Medical Research) Unité 1175, French National Research Institute for Sustainable Development (IRD), Montpellier, France.
Valentin DupasquierDepartment of Cardiology, Montpellier University Hospital, Montpellier, France.
Marlhand C HemilemboloNational Onchocerciasis Control Program (PNLO), General Direction of Epidemiology and Disease Control in Brazzaville, Ministry of Health and Population, Brazzaville, Republic of Congo.
Sébastien D S PionTransVIHMI, University of Montpellier, Inserm (National Institute of Health and Medical Research) Unité 1175, French National Research Institute for Sustainable Development (IRD), Montpellier, France.
Jean Claude DjontuCongolese Foundation for Medical Research, Brazzaville, Republic of Congo.
Ludovic RancéDepartment of Anesthesiology and Critical Care Medicine, Montpellier University Hospital, Montpellier, France.
Philippe SouteyrandDepartment of Medical Imaging, European Hospital, Marseille, France.
François MissamouNational Onchocerciasis Control Program (PNLO), General Direction of Epidemiology and Disease Control in Brazzaville, Ministry of Health and Population, Brazzaville, Republic of Congo.
Michel Boussinesq *TransVIHMI, University of Montpellier, Inserm (National Institute of Health and Medical Research) Unité 1175, French National Research Institute for Sustainable Development (IRD), Montpellier, France.
Francine Ntoumi *Congolese Foundation for Medical Research, Brazzaville, Republic of Congo.
Cédric B ChesnaisTransVIHMI, University of Montpellier, Inserm (National Institute of Health and Medical Research) Unité 1175, French National Research Institute for Sustainable Development (IRD), Montpellier, France. cedric.chesnais@ird.fr.

Funding

HORIZON EUROPE European Research Council 949963
6 · The paper itself

Abstract

backgroundData suggest excess mortality is associated with loiasis, which is endemic to Central Africa, although the underlying mechanisms remain unknown. We hypothesized that there could be an association between Loa loa microfilarial densities (MFD) and lower spleen volume (SV) due to micro-obstruction linked to circulating microfilariae (mf). This could result in functional hyposplenia and a higher burden of infections. Our objective was to investigate the impact of L. loa MFD and malaria on spleen's bi-dimensional dimensions, volume, and parenchymal lesions.

methodsWe included 981 participants aged 18-88 years in a cross-sectional study conducted in May-June 2022 in the Republic of the Congo. Centralized ultrasonographic examination was performed. The primary outcomes included SV, splenomegaly (cranio-caudal-distance ≥ 13 cm), and anatomical hyposplenia (AH) (SV ≤ 80, ≤ 110 or ≤ 150 cm

resultsAmong 981 participants, 139 (14.1%) had splenomegaly, and 26 (2.7%) and 175 (17.8%) had SV ≤ 80 and ≤ 150 cm

conclusionsThis study provides a detailed description of spleen morphology and the factors influencing its size in a rural central African population. It demonstrates a strong association between L. loa MFD and reduced SV, suggesting that loiasis may lead to AH, and potentially to functional hyposplenia, with consequences such as increased susceptibility to bacterial infections. Malaria was associated with splenomegaly, with a figure of HMS consistent with estimates from other African countries.

Indexed as

LoaLoiasisSpleenSplenic DiseasesSplenomegalyAdolescentAdultAgedAged, 80 and overAnimalsCongoCross-Sectional StudiesFemaleHumansMaleMicrofilariaeHyposplenismLoiasisMalariaParasitic diseasesSpleenSplenomegalyUltrasonographic examination

Identifiers

PMID39923091
PMCPMC11806796

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.