Evidence map›Paper›PMID 32264941›Full record

SynthesisParasites & vectors2020

Does winter cold really limit the dengue vector Aedes aegypti in Europe?

Isabelle M Kramer, Aljoscha Kreß, Doris Klingelhöfer, Christian Scherer, Parbati Phuyal, Ulrich Kuch, Bodo Ahrens, David A Groneberg, Meghnath Dhimal, Ruth Müller

Abstract readMeta-Analysis
In one paragraph

Synthesis in Parasites & vectors, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed, 1 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

19 citing papers in PubMed, 1 synthesis or guideline pooled it.

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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

10 authors.

Isabelle M KramerInstitute of Occupational, Social and Environmental Medicine, Goethe University, Frankfurt am Main, Germany. kramer@med.uni-frankfurt.de.
Aljoscha KreßInstitute of Occupational, Social and Environmental Medicine, Goethe University, Frankfurt am Main, Germany.
Doris KlingelhöferInstitute of Occupational, Social and Environmental Medicine, Goethe University, Frankfurt am Main, Germany.
Christian SchererInstitute of Occupational, Social and Environmental Medicine, Goethe University, Frankfurt am Main, Germany.
Parbati PhuyalInstitute of Occupational, Social and Environmental Medicine, Goethe University, Frankfurt am Main, Germany.
Ulrich KuchInstitute of Occupational, Social and Environmental Medicine, Goethe University, Frankfurt am Main, Germany.
Bodo AhrensInstitute for Atmospheric and Environmental Sciences, Goethe University, Frankfurt am Main, Germany.
David A GronebergInstitute of Occupational, Social and Environmental Medicine, Goethe University, Frankfurt am Main, Germany.
Meghnath DhimalNepal Health Research Council, Kathmandu, Nepal.
Ruth MüllerInstitute of Occupational, Social and Environmental Medicine, Goethe University, Frankfurt am Main, Germany.

Funding

Federal Ministry of Education and Research (BMBF) 01Kl1717
6 · The paper itself

Abstract

backgroundAedes aegypti is a potential vector for several arboviruses including dengue and Zika viruses. The species seems to be restricted to subtropical/tropical habitats and has difficulties in establishing permanent populations in southern Europe, probably due to constraints during the winter season. The aim of this study was to systematically analyze the cold tolerance (CT) of Ae. aegypti in its most cold-resistant life stage, the eggs.

methodsThe CT of Ae. aegypti eggs was compared with that of Ae. albopictus which is well established in large parts of Europe. By systematically studying the literature (meta-analysis), we recognized that CT has been rarely tested in Ae. aegypti eggs, but eggs can survive at zero and sub-zero temperatures for certain exposure periods. To overcome potential bias from experimental differences between studies, we then conducted species comparisons using a harmonized high-resolution CT measuring method. From subtropical populations of the same origin, the survival (hatching in %) and emergence of adults of both species were measured after zero and sub-zero temperature exposures for up to 9 days (3 °C, 0 °C and - 2 °C: ≤ 9 days; - 6 °C: ≤ 2 days).

resultsOur data show that Ae. aegypti eggs can survive low and sub-zero temperatures for a short time period similar to or even better than those of Ae. albopictus. Moreover, after short sub-zero exposures of eggs of both species, individuals still developed into viable adults (Ae. aegypti: 3 adults emerged after 6 days at - 2 °C, Ae. albopictus: 1 adult emerged after 1 day at - 6 °C).

conclusionsThus, both the literature and the present experimental data indicate that a cold winter may not be the preventing factor for the re-establishment of the dengue vector Ae. aegypti in southern Europe.

Indexed as

Behavior, AnimalCold TemperatureSeasonsAedesAnimalsEuropeFemaleLarvaMosquito VectorsOvumCold hardinessCold toleranceDistribution limitsOverwinteringPhenotypic plasticitySub-zero exposureWinter survival

Identifiers

PMID32264941
PMCPMC7140351

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

None linked

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.