Cited by 209Parasitic Diseases Research and TreatmentHelminth infection and controlVector-borne infectious diseases

Changing climate and changing vector-borne disease distribution: the example of Dirofilaria in Europe

Genchi, Claudio, Mortarino, Michele, Rinaldi, Laura, Cringoli, Giuseppe, Traldi, Giorgio, Genchi, Marco·2011·Veterinary Parasitology

Abstract

Climatic changes, together with an increase in the movement of dogs across Europe, have caused an increase in the geographical range of Dirofilaria infections. The present paper is focuses on northeastern European countries, where survey data have shown an increase of Dirofilaria repens infections both in animals and humans. A growing degree day-based forecast model has been developed to predict the occurrence. The model is based on evidence that there is a threshold of 14 °C below which Dirofilaria development will not proceed in mosquitoes, there is a requirement of 130 growing degree-days (GDDs) for larvae to reach infectivity, and there is a maximum life expectancy of 30 days for a mosquito vector. The output of this model predicted that the summer temperatures (with peaks in August) are sufficient to facilitate extrinsic incubation of Dirofilaria even at latitudes of 56 °N and longitudes of 39 °E. Despite the fact that both Dirofilaria immitis and D. repens have the same temperature requirement for extrinsic incubation in mosquitoes, empirical data has shown that D. repens is the main cause of dirofilarial infections in both humans and animals. Clinical signs are absent in most canine infections with D. repens. Furthermore, diagnosis is problematic and in-clinic serological tests, such as those for D. immitis, do not exist. Therefore, most infections go undiagnosed, allowing the infection to spread undetected.

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Crossref · 10.1016/j.vetpar.2011.01.012

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  • Urban heat islands may provide thermal conditions required for D. immitis to complete larval development to the infective L3 stage even in regions where the general climate would otherwise be less favorable, provided suitable small-scale mosquito breeding sites are present.

    “For example, urban heat islands may provide the thermal conditions required for D. immitis to complete larval development to the infective L3 stage, even in regions where the general climate would otherwise be less favorable, provided that suitable small-scale mosquito breeding sites are also present (6).”
  • Few studies have jointly examined additional host and environmental variables-such as age, sex, breed, or habitat-in relation to realized transmission risk.

    “Despite the substantial body of knowledge on the epidemiology of D. immitis in Spain and Portugal, few studies have jointly examined additional host and environmental variables—such as age, sex, breed, or habitat—in relation to realized transmission risk (6, 7).”
  • More optimal conditions created by temperature increases allow the spread of mosquitoes to other areas where previously climatic conditions prevented their presence.

    “This has led to the creation of more optimal conditions that allow the spread of mosquitoes to other areas where previously the climatic conditions prevented their presence [1,55,78,166,167].”
  • Considering that larval development does not occur below the threshold temperature of around 14 °C, a high risk of D. immitis infection was estimated in southern Spain and Portugal, some areas of southern France, Corsica, Bosnia and Herzegovina, Turkey, Cyprus, the coast of Albania, several regions of northern and southern Italy, Naples, Sardinia and Sicily, Greece, some areas of Bulgaria, south-e

    “Moreover, considering that larval development does not occur below the threshold temperature of around 14 °C, the number of heartworm generations was determined and a high risk of infection was estimated in southern Spain and Portugal, some areas of southern France, Corsica, Bosnia and Herzegovina, Turkey, Cyprus, the coast of Albania, several regions of northern and southern Italy, Naples, Sard”
  • GIS studies across the whole continent showed that when climate data collected at weather stations in a given area were favourable for mosquito development, positive dogs were found in those same locations.

    “Furthermore, studies based on GIS carried out in the whole continent [167] showed that when climate data collected at several weather stations in a given area were favourable for the development of mosquitoes, a presence of positive dogs was found in those same locations.”

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Authors
Genchi, C., Mortarino, M., Rinaldi, L., Cringoli, G., Traldi, G., & Genchi, M.
Affiliations
  • University of Milan (IT)
  • University of Naples Federico II (IT)
  • University of Pavia (IT)
Corresponding author
Genchi, Claudio
Venue
Veterinary Parasitology
Publisher
Elsevier BV
Published
2011-03
Volume
176
Issue
4
Pages
295-299
ISSN
0304-4017 (ISSN-L)
OpenAlex
W2078996770
Cited by
209
References
49
Citations by year
2026: 13 · 2025: 9 · 2024: 18 · 2023: 11 · 2022: 16 · 2021: 12 · 2020: 22 · 2019: 20 · 2018: 10 · 2017: 13 · 2016: 15 · 2015: 17 · 2014: 21 · 2013: 7 · 2012: 4
FWCI
7.12
Type
journal article
Language
en
Open access
closed
Locations
  • Veterinary Parasitology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Infectious Diseases › Parasitic Diseases Research and Treatment
  • Health Sciences › Veterinary › Small Animals › Helminth infection and control
  • Life Sciences › Immunology and Microbiology › Parasitology › Vector-borne infectious diseases
Keywords
Dirofilaria repens, Dirofilaria immitis, climate change, vector-borne diseases, geographical range expansion, growing-degree-day model, extrinsic incubation, mosquito vectors, canine heartworm disease, human dirofilariasis, undiagnosed infection, serological diagnosis, Northeastern Europe
MeSH terms
Animals, Dirofilaria, Dirofilariasis, Dog Diseases, Dogs, Europe, Forecasting, Humans, Insect Vectors, Models, Biological, Culicidae, Seasons, Temperature, Time Factors, Travel, Zoonoses, Geographic Information Systems, Climate Change

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