Evidence map›Paper›PMID 26830203›Full record

ArticleParasites & vectors2016

Distribution of Angiostrongylus vasorum and its gastropod intermediate hosts along the rural-urban gradient in two cities in the United Kingdom, using real time PCR.

Nor Azlina A Aziz, Elizabeth Daly, Simon Allen, Ben Rowson, Carolyn Greig, Dan Forman, Eric R Morgan

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 19 papers.

0numbers the graph read from it
0cells of the map it votes in
19citing 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

19 citing papers in PubMed.

  1. Trial
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  5. Organ Tropism ofPathogens (Basel, Switzerland) · 2024
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  7. Pathogens (Basel, Switzerland) · 2022
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  8. Angiostrongylosis in Animals and Humans in Europe.Pathogens (Basel, Switzerland) · 2021
    Review
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  10. Habitat Characteristics as Potential Drivers of thePathogens (Basel, Switzerland) · 2021
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  11. Detection ofPathogens (Basel, Switzerland) · 2020
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  12. Article
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  15. Article
  16. Identification and epidemiological analysis ofIrish veterinary journal · 2019
    Article
  17. Article
  18. Article
  19. 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

7 authors.

Nor Azlina A AzizUniversity of Bristol, Veterinary Parasitology & Ecology Group, School of Biological Sciences, Bristol Life Sciences Building, 24, Tyndall Avenue, Bristol, BS8 1TQ, UK. azlinaaziz@unisza.edu.my.
Elizabeth DalyUniversity of Bristol, Veterinary Parasitology & Ecology Group, School of Biological Sciences, Bristol Life Sciences Building, 24, Tyndall Avenue, Bristol, BS8 1TQ, UK. ed13322.2013@my.bristol.ac.uk.
Simon AllenUniversity of Bristol, Veterinary Parasitology & Ecology Group, School of Biological Sciences, Bristol Life Sciences Building, 24, Tyndall Avenue, Bristol, BS8 1TQ, UK. simon@gowerbirdhospital.org.uk.
Ben RowsonDepartment of Natural Sciences, National Museum of Wales, Cardiff, Wales, CF10 3NP, UK. Ben.Rowson@museumwales.ac.uk.
Carolyn GreigDepartment of Biosciences, Swansea University, Singleton Park, Swansea, SA2 8PP, UK. C.Greig@swansea.ac.uk.
Dan FormanDepartment of Biosciences, Swansea University, Singleton Park, Swansea, SA2 8PP, UK. d.w.forman@swansea.ac.uk.
Eric R MorganUniversity of Bristol, Veterinary Parasitology & Ecology Group, School of Biological Sciences, Bristol Life Sciences Building, 24, Tyndall Avenue, Bristol, BS8 1TQ, UK. eric.morgan@bristol.ac.uk.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundAngiostrongylus vasorum is a highly pathogenic metastrongylid nematode affecting dogs, which uses gastropod molluscs as intermediate hosts. The geographical distribution of the parasite appears to be heterogeneous or patchy and understanding of the factors underlying this heterogeneity is limited. In this study, we compared the species of gastropod present and the prevalence of A. vasorum along a rural-urban gradient in two cities in the south-west United Kingdom.

methodsThe study was conducted in Swansea in south Wales (a known endemic hotspot for A. vasorum) and Bristol in south-west England (where reported cases are rare). In each location, slugs were sampled from nine sites across three broad habitat types (urban, suburban and rural). A total of 180 slugs were collected in Swansea in autumn 2012 and 338 in Bristol in summer 2014. A 10 mg sample of foot tissue was tested for the presence of A. vasorum by amplification of the second internal transcribed spacer (ITS-2) using a previously validated real-time PCR assay.

resultsThere was a significant difference in the prevalence of A. vasorum in slugs between cities: 29.4% in Swansea and 0.3% in Bristol. In Swansea, prevalence was higher in suburban than in rural and urban areas. Comparing the sampled slug fauna, Arion rufus was found in greater numbers in Swansea than Bristol, and was commonly infected (prevalence 41%). This, alongside the timing of slug collections in summer rather than autumn, could explain low infection prevalence in the Bristol sample. In the absence of Ar. rufus as a preferred host for A. vasorum, Ar. flagellus and Limacus maculatus appear to act as versatile hosts that are present in suburban and urban areas in Swansea (prevalence in Ar. flagellus 33%; in L. maculatus 44%) and in Bristol (prevalence in Ar. flagellus 0.9%). These slug species might provide A. vasorum with an alternative vehicle to reach the final host, when the main host Ar. rufus is scarce or absent.

conclusionWe conclude that the composition of the slug fauna varies spatially, and that this could help explain patchiness in the prevalence of A. vasorum. A suburban peak was found in the prevalence of infection in intermediate hosts, perhaps explained by a higher density of competent intermediate and/or definitive hosts.

Indexed as

AngiostrongylusAnimalsCitiesDNA, HelminthDNA, Ribosomal SpacerGastropodaGeographyPrevalenceReal-Time Polymerase Chain ReactionSequence Analysis, DNAUnited KingdomDNA, HelminthDNA, Ribosomal Spacer

Identifiers

PMID26830203
PMCPMC4736697

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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.