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Bogogiannidou Z, Vontas A, Dadouli K, Kyritsi MA, Soteriades S, Nikoulis DJ, Mouchtouri VΑ, Koureas M, Kazakos EI, Spanos EG, Gioula G, Ntzani EE, Eleftheriou AA, Vatopoulos A, Petinaki E, Papaevangelou V, Speletas M, Tsiodras S, Hadjichristodoulou C. Repeated leftover serosurvey of SARS-CoV-2 IgG antibodies, Greece, March and April 2020. ACTA ACUST UNITED AC 2020; 25. [PMID: 32762796 PMCID: PMC7459271 DOI: 10.2807/1560-7917.es.2020.25.31.2001369] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A serosurvey of IgG antibodies against severe acute respiratory coronavirus 2 (SARS-CoV-2) was performed during March and April 2020. Among 6,586 leftover sera, 24 (0.36%) were positive, with higher prevalence in females, older individuals and residents of large urban areas. Seroprevalence was estimated at 0.02% and 0.25%, respectively, in March and April, infection fatality rate at 2.66% and 0.54%. Our findings confirm low COVID-19 incidence in Greece and possibly the effectiveness of early measures.
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Affiliation(s)
- Zacharoula Bogogiannidou
- Laboratory of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Alexandros Vontas
- Laboratory of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Katerina Dadouli
- Laboratory of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Maria A Kyritsi
- Laboratory of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Soteris Soteriades
- Laboratory of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Dimitrios J Nikoulis
- Laboratory of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Varvara Α Mouchtouri
- Laboratory of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Michalis Koureas
- Laboratory of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Evangelos I Kazakos
- Faculty of Midwifery, School of Health Sciences, University of Western Macedonia, Kozani, Greece
| | - Emmanouil G Spanos
- Laboratory of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Georgia Gioula
- National Influenza Reference Laboratory for Northern Greece, Microbiology Department, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Evangelia E Ntzani
- Institute of Biosciences, University Research Center of loannina, Ioannina, Greece.,Center for Evidence Synthesis in Health, Department of Health Services, Policy and Practice, School of Public Health, Brown University, Providence, United States.,Department of Hygiene and Epidemiology, University of Ioannina Faculty of Medicine, Ioannina, Greece
| | - Alexandros A Eleftheriou
- Department of Hygiene and Epidemiology, University of Ioannina Faculty of Medicine, Ioannina, Greece
| | - Alkiviadis Vatopoulos
- Department of Public Health Policy, School of Public Health, University of West Attica, Athens, Greece
| | - Efthimia Petinaki
- Department of Microbiology, University Hospital of Larissa, University of Thessaly, Larissa, Greece
| | - Vassiliki Papaevangelou
- Third Department of Paediatrics, National and Kapodistrian University of Athens, School of Medicine, Attikon University Hospital, Athens, Greece
| | - Matthaios Speletas
- Department of Immunology and Histocompatibility, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Sotirios Tsiodras
- Fourth Department of Internal Medicine, National and Kapodistrian University of Athens, School of Medicine, Attikon University Hospital, Athens, Greece
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Kazakos EI, Dorrell N, Polyzos SA, Deretzi G, Kountouras J. Comment on "Effect of biofilm formation by clinical isolates of Helicobacter pylori on the efflux-mediated resistance to commonly used antibiotics". World J Gastroenterol 2017; 23:6194-6196. [PMID: 28970736 PMCID: PMC5597512 DOI: 10.3748/wjg.v23.i33.6194] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 06/27/2017] [Accepted: 07/22/2017] [Indexed: 02/06/2023] Open
Abstract
Attaran et al[1] have recently shown that decreased susceptibility of established Helicobacter pylori (H. pylori) biofilms to specific antibiotics, was associated with the overtly enhanced transcription of two efflux pump genes, hp1165 and hefA, involved in specific resistance to tetracycline and multiple antibiotics, respectively. Apart from antibiotic exposure, secretion of multiple antimicrobial peptides, such as human β-defensins (hβDs), by the gastric epithelium upon Hp challenge, may act as early triggering events that positively impact biofilm formation and thus, antibiotic resistance. In this regard, we undertook genomic transcriptional studies using Hp 26695 strain following exposure to sublethal, similar to those present in the gastric niche, concentrations of hβDs in an attempt to provide preliminary data regarding possible mechanisms of immune evasion and selective sensitivity of Hp. Our preliminary results indicate that hβD exposure ignites a rapid response that is largely due to the activation of several, possibly interconnected transcriptional regulatory networks - origons - that ultimately coordinate cellular processes needed to maintain homeostasis and successful adaptation of the bacterium in the gastric environment. In addition, we have shown that both antibiotic and hβD resistance are mediated by dedicated periplasmic transporters, including the aforementioned efflux pump genes hp1165 and hefA, involved in active export of antibiotics from the cell membrane and/or, as recently suggested, substrate sensing and signalling. Furthermore, it appears that sublethal doses of hβDs may enhance biofilm formation by the sustained expression of, mainly, quorum sensing-related genes. In conclusion, we provide additional data regarding the role of specific innate immune molecules in antibiotic cross-resistance mechanisms that may deepen our understanding in the context of the development of novel eradication regimens.
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Affiliation(s)
- Evangelos I Kazakos
- Department of Medicine, the Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, 54642 Thessaloniki, Greece
| | - Nick Dorrell
- Department of Pathogen Molecular Biology, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT, United Kingdom
| | - Stergios A Polyzos
- Department of Medicine, the Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, 54642 Thessaloniki, Greece
| | - Georgia Deretzi
- Department of Neurology, Multiple Sclerosis Unit, Papageorgiou General Hospital, 54629 Thessaloniki, Greece
| | - Jannis Kountouras
- Department of Medicine, the Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, 54642 Thessaloniki, Greece
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