Evidence map›Paper›PMID 27234215›Full record

ArticleParasites & vectors2016

Environmental factors influencing tick densities over seven years in a French suburban forest.

Richard E L Paul, Martine Cote, Evelyne Le Naour, Sarah I Bonnet

Abstract read
In one paragraph

Article in Parasites & vectors, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 49 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
49citing papers in PubMed, 2 pooled it
–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

49 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Article
  4. Drivers of tick community structure in a rhinoceros meta-population in Kenya.International journal for parasitology. Parasites and wildlife · 2026
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  12. Prevalence of Lyme Disease and Relapsing FeverPathogens (Basel, Switzerland) · 2024
    Review
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  16. Article
  17. The influence of forest habitat type onCurrent research in parasitology & vector-borne diseases · 2024
    Article
  18. Temporal dynamics of theCurrent research in parasitology & vector-borne diseases · 2024
    Article
  19. Article
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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

4 authors.

Richard E L PaulDepartment of Genome and Genetics, Institut Pasteur, Unité de Génétique Fonctionnelle des Maladies Infectieuses, 28 rue du docteur Roux, 75724, Paris, France.
Martine CoteUMR BIPAR INRA-ANSES-ENVA, 14 rue Pierre et Marie Curie, 94701, Maisons-Alfort cedex, France.
Evelyne Le NaourUMR BIPAR INRA-ANSES-ENVA, 14 rue Pierre et Marie Curie, 94701, Maisons-Alfort cedex, France.
Sarah I BonnetUMR BIPAR INRA-ANSES-ENVA, 14 rue Pierre et Marie Curie, 94701, Maisons-Alfort cedex, France. sarah.bonnet@vet-alfort.fr.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundWorldwide changes in socio-economic and environmental factors and the global climate are recognised causes of variation in tick distribution and density. Thus it is of great importance that new studies address the changing risk of infection for exposed populations. In Europe, Ixodes ricinus ticks are the most common vectors of several pathogens impacting veterinary and public health that have colonised suburban habitats.

methodsThis study aimed to evaluate longitudinal I. ricinus questing densities and infection rates over 7 years in a French suburban forested area with high human population density. Ticks were collected in spring yearly between 2008 and 2014 and, out of a total of 8594 collected I. ricinus, a representative subset of adult females (n = 259) were individually examined for the presence of several pathogens via PCR.

resultsNymph densities peaked in 2009-2011, and then declined in 2012-2014. Changes in monthly temperature only had a modest impact on this variation. In contrast, analysis revealed a complex intra-annual relationship between mean nymph density and both concurrent and lagged mean monthly temperatures. The following pathogens were detected in the studied area: Anaplasma phagocytophilum, Rickettsia helvetica, Babesia venatorum and B. divergens, Francisella tularensis, Borrelia miyamotoi, B. afzelii/valaisiana, B. garinii/lusitaniae and Bartonella spp.

conclusionOur findings reinforce the conclusion that ticks are important vectors of pathogenic microorganisms in suburban forests and suggest that despite complex intra-annual relationships between tick densities and temperature, there is no evidence for a climate-associated increase in infection risk over the 7-year period. Rather, tick densities are likely to be strongly influenced by population density fluctuations in vertebrate host species and wildlife management. Further detailed studies on the impact of climate change on tick population densities are required.

Indexed as

Anaplasma phagocytophilumAnimalsArachnid VectorsBabesiaBartonellaBorreliaFemaleForestsFranceHumansIxodesLongitudinal StudiesMaleNymphPopulation DensityRickettsiaClimate impactIxodes ricinusLongitudinal studyPeri-urban forestTick-borne pathogensTick densityTicks

Identifiers

PMID27234215
PMCPMC4884405

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LicenceCC BY
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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.