Evidence map›Paper›PMID 32307010›Full record

ArticleParasites & vectors2020

Crimean-Congo hemorrhagic fever virus in tortoises and Hyalomma aegyptium ticks in East Thrace, Turkey: potential of a cryptic transmission cycle.

Sirri Kar, Sergio E Rodriguez, Gurkan Akyildiz, Maria N B Cajimat, Rifat Bircan, Megan C Mears, Dennis A Bente, Aysen G Keles

Abstract read
In one paragraph

Article in Parasites & vectors, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
26citing 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

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

  1. Pooled it
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  4. Article
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  9. Article
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  13. Article
  14. Perception of Ticks and Tick-Borne Diseases Worldwide.Pathogens (Basel, Switzerland) · 2023
    Review
  15. Crimean-Congo haemorrhagic fever virus.Nature reviews. Microbiology · 2023
    Review
  16. Article
  17. Review
  18. Review
  19. Article
  20. International journal for parasitology. Parasites and wildlife · 2022
    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

8 authors.

Sirri KarGalveston National Laboratory, Department of Microbiology and Immunology, Institute for Human Infections and Immunity, University of Texas Medical Branch, Galveston, TX, USA.
Sergio E RodriguezGalveston National Laboratory, Department of Microbiology and Immunology, Institute for Human Infections and Immunity, University of Texas Medical Branch, Galveston, TX, USA.
Gurkan AkyildizDepartment of Biology, Tekirdag Namik Kemal University, Tekirdag, Turkey.
Maria N B CajimatGalveston National Laboratory, Department of Microbiology and Immunology, Institute for Human Infections and Immunity, University of Texas Medical Branch, Galveston, TX, USA.
Rifat BircanDepartment of Biology, Tekirdag Namik Kemal University, Tekirdag, Turkey.
Megan C MearsDepartment of Pathology, University of Texas Medical Branch, Galveston, TX, USA.
Dennis A BenteGalveston National Laboratory, Department of Microbiology and Immunology, Institute for Human Infections and Immunity, University of Texas Medical Branch, Galveston, TX, USA. dabente@utmb.edu.
Aysen G KelesFaculty of Health Sciences, Marmara University, Istanbul, Turkey.

Funding

Marmara Üniversitesi SAG-B-131216-0522
6 · The paper itself

Abstract

backgroundRecent reports have demonstrated the presence of Crimean-Congo hemorrhagic fever virus (CCHFV) genomic material in Hyalomma aegyptium ticks feeding primarily on tortoises belonging to the genus Testudo. This raises the question if these ticks and their hosts play a role in the natural transmission dynamics of CCHFV. However, the studies are limited, and assessing the relevance of H. aegyptium in perpetuating the virus in nature, and a potential spillover to humans remains unknown. This study aimed to detect CCHFV in H. aegyptium ticks and their tortoise hosts in the East Thrace region of Turkey, where H. aegyptium is the most common human-biting tick and where a high density of tortoises of the genus Testudo can be found.

methodsDuring the study period, 21 blood samples from different tortoises (2 T. hermanni and 19 T. graeca), 106 tick pools (containing 448 males, 152 females, 93 nymphs and 60 larvae) collected from 65 tortoises (5 T. hermanni and 60 T. graeca), 38 adult unfed questing ticks (25 males and 13 females, screened individually) and 14 pools (containing 8 nymphs and 266 larvae) of immature unfed questing ticks collected from the ground were screened for CCHFV genome by nested PCR and partial genomes sequenced.

resultsAs a result of the screening of these 179 samples, 17 (9.5%) were detected as positive as follows: 2 of 21 blood samples (9.52%), 13 (containing 18 nymphs in 3 pools, and 52 males and 8 females in 10 pools) of 106 tick pools from tortoises (12.26%), and 2 of 38 adult questing ticks (5.26%). No positive result was determined in 14 pools of immature questing ticks.

conclusionsPrevious studies have shown that reptiles can participate in the transmission of arthropod-borne viruses, but they may contribute to different aspects of the disease ecology and evolution of tick-borne viral pathogens. Our results indicate the presence of CCHFV in questing and feeding H. aegyptium ticks as well as tortoise hosts. This may indicate that CCHFV circulates in a cryptic transmission cycle in addition to the primary transmission cycle that could play a role in the natural dynamic of the virus and the transmission to humans.

Indexed as

Hemorrhagic Fever Virus, Crimean-CongoAnimalsArachnid VectorsDisease ReservoirsDNA, ViralHemorrhagic Fever, CrimeanPhylogenyPolymerase Chain ReactionTicksTurkeyTurtlesZoonosesDNA, ViralCrimean-Congo hemorrhagic fever virusCryptic transmission cycleHyalomma aegyptiumThraceTortoiseTurkey

Identifiers

PMID32307010
PMCPMC7168965

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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.