Vasileios Karras

ORCID: 0000-0002-2307-4032
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About
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Research Areas
  • Mosquito-borne diseases and control
  • Insect Pest Control Strategies
  • Insect symbiosis and bacterial influences
  • Malaria Research and Control
  • Neurobiology and Insect Physiology Research
  • Insect and Pesticide Research
  • Insect Utilization and Effects
  • Insect behavior and control techniques
  • Viral Infections and Vectors
  • Trypanosoma species research and implications
  • Psychology of Moral and Emotional Judgment
  • Dengue and Mosquito Control Research
  • Insect Resistance and Genetics
  • Research on Leishmaniasis Studies
  • Toxin Mechanisms and Immunotoxins

Benaki Phytopathological Institute
2020-2024

University of West Attica
2024

University of Thessaly
2024

The sterile insect technique (SIT) involves releasing large numbers of males to outcompete wild in mating with females, leading a decline pest populations. In the current study, we conducted suppression trial Greece against invasive dengue vector mosquito Aedes albopictus (Skuse) through weekly release for 22 weeks from June September 2019. Our approach included long-distance transport mosquitoes, and their at density 2,547 ± 159 per hectare week as part an area-wide integrated management...

10.1051/parasite/2024020 article EN cc-by Parasite 2024-01-01

Abstract The flavivirus West Nile Virus (WNV), which is transmitted by mosquitoes, poses a significant threat to both humans and animals, its outbreaks often challenge public health in Europe other continents. In recent years, there an increasing trend of WNV incidence rates across several European countries. However, whether year-round circulation or seasonal introduction has yet be elucidated. Real-time polymerase chain reaction (PCR) identified WNV-positive Culex pipiens mosquitos 6 out...

10.1186/s13071-024-06367-6 article EN cc-by Parasites & Vectors 2024-07-02

Aedes albopictus, an invasive mosquito species, is currently well established in many European countries, posing high risks to human health. A preliminary trial using repetitive releases of irradiated sterile male mosquitoes was designed, implemented and evaluated for the first time Greece. The main scope this investigate efficacy insect technique (SIT) on wild population egg hatch rate Greece mass-produced from another country (Italy). study conducted Vravrona area, close Athens...

10.3390/insects12020110 article EN cc-by Insects 2021-01-27

Negative impacts on the environment from continuous use of synthetic insecticides against mosquitoes has driven research towards more ecofriendly products. Phytochemicals, classified as low-risk substances, have been recognized potential larvicides mosquitoes; however, problems related to water solubility and stability are limiting factors for their in mosquito control programs field. In this context, many researchers focused formulating essential oils nanoemulsions, exploiting innovative...

10.3390/insects11110740 article EN cc-by Insects 2020-10-28

Odorant-dependent behaviors in insects are triggered by the binding of odorant ligands to variable subunits heteromeric olfactory receptors. Previous studies have shown, however, that specific odor ORco, common subunit receptor heteromers, may allosterically alter function and profoundly affect subsequent behavioral responses. Using an insect cell-based screening platform, we identified characterized several antagonists coreceptor African malaria vector Anopheles gambiae (AgamORco) a small...

10.1074/jbc.ra120.016557 article EN cc-by Journal of Biological Chemistry 2020-12-09

Community involvement in Aedes albopictus management can be very efficient and result raising awareness among citizens. Toward this end, a door-to-door campaign encourage active community participation vector control. The current study describes the results of an intervention where KAP (knowledge, attitude, practices) survey tool was paired with implemented as method Vravrona area (Attica, Greece) before release sterile males (sterile insect technique, SIT) against albopictus. used to shed...

10.3390/insects12030212 article EN cc-by Insects 2021-03-02

This manuscript compiles all the available information on presence of native mosquito species Aedes cretinus in Greece, before and after invasion albopictus. Mosquito survey data particularly from Region Attica, as well other areas Greece indicate Ae. has become scarce since albopictus, which is now widespread. mini review occurrence over years indicates a marked decline its populations that seems to be related prevalence invasive need for more comprehensive entomological surveys where these...

10.14411/eje.2024.022 article EN cc-by European Journal of Entomology 2024-05-27

Abstract A 2-yr sand fly (Diptera: Psychodidae) seasonality study was performed in Attica Region, Greece, from June 2017 until November 2018, aiming also to detect the presence of Leishmania infection collected flies. In total, 701 flies were urban areas within Region using BG-Sentinel traps, set weekly eight fixed sites. Five species identified morphologically and molecularly, namely Phlebotomus tobbi (Adler Theodor), which most commonly species, followed by P. Neglectus (Tonnoir), papatasi...

10.1093/jme/tjaa158 article EN Journal of Medical Entomology 2020-08-18

<title>Abstract</title> West Nile Virus (WNV) is one of the major vector-borne diseases globally, including Greece. This first research study in Greece, describing identification WNV overwintering active <italic>Culex pipiens</italic> populations, captured adult traps, for time period 2021–2023. positive mosquito pools were recorded three out 24 areas, representing two coastal regional units Attica Region suggesting a clustered circulation during winter 2022. Our findings underline need...

10.21203/rs.3.rs-4205818/v1 preprint EN cc-by Research Square (Research Square) 2024-04-08

ABSTRACT Insect olfactory receptors are heteromeric ligand-gated cation channels composed of an obligatory receptor subunit, ORco, and one many variable subunits, ORx, in as yet undefined molar ratios. When expressed alone ex vivo , ORco forms homotetrameric gated by ORco-specific ligands acting channel agonists. Using insect cell-based system a functional platform for expressing mosquito odorant vivo, we identified small molecules natural origin specific antagonists, orthosteric or...

10.1101/2024.06.24.600390 preprint EN bioRxiv (Cold Spring Harbor Laboratory) 2024-06-27

Invasive mosquito species, such as Aedes albopictus, pose significant threats to both ecosystems and public health due their role in transmitting diseases, dengue, Zika, chikungunya. The Sterile Insect Technique (SIT) is a promising vector control strategy aimed at reducing populations by releasing sterile males mate with wild females reduce reproduction rates. In this study, we employed the captive cohort method, which assesses remaining longevity of randomly caught released individuals,...

10.3390/insects15110826 article EN cc-by Insects 2024-10-23

The invasive mosquito species Aedes albopictus, commonly known as the Asian Tiger Mosquito, is a significant global health concern due to its role vector for diseases such Dengue, Zika, and Chikungunya. In Greece, Ae. albopictus was first detected in 2005, with subsequent widespread establishment across country. This study investigates genetic diversity phylogeography of Greek populations by analyzing mitochondrial cytochrome oxidase I (COI) gene sequences. A total 488 female individuals...

10.1101/2024.12.20.629447 preprint EN bioRxiv (Cold Spring Harbor Laboratory) 2024-12-22

Mosquito management programs in the urban environment of Italian cities mainly rely on larval control with conventional insecticides, primarily targeting road drains that constitute principal mosquito breeding sites encountered public. The repeated utilization synthetic insecticides may have adverse effects non-targets and lead to resistance development issues, while performance biopesticides encounters limitations field use. Botanical as single agents or binary mixtures been extensively...

10.3390/insects13110977 article EN cc-by Insects 2022-10-25

ABSTRACT Odorant-dependent behaviors in insects are triggered by the binding of odorant ligands to variable subunits heteromeric olfactory receptors. Previous studies have shown, however, that specific odor ORco, common subunit receptor heteromers, may alter allosterically function and affect profoundly subsequent behavioral responses. Here we report on identification several antagonists co-receptor African malaria vector Anopheles gambiae , AgamORco, a small collection natural volatile...

10.1101/2020.04.26.062919 preprint EN cc-by-nc bioRxiv (Cold Spring Harbor Laboratory) 2020-04-29
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