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Chelly S, Jaziri S, Ammar A, Ezzi O, Douss N, Saffar S, Tritar M, Njah M, Mahjoub M. Safety and efficiency of COVID-19 vaccine in North Africa. Hum Vaccin Immunother 2024; 20:2306703. [PMID: 38304972 PMCID: PMC10841012 DOI: 10.1080/21645515.2024.2306703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 01/15/2024] [Indexed: 02/03/2024] Open
Abstract
Background In the absence of a specific treatment for COVID-19, preventive measures have been implemented to control this pandemic and vaccination is one of them. However, it is crucial to verify the safety and efficiency of every vaccine. The aim was to determinate the predictive factors of side effects and reinfection after COVID-19 vaccine. Methods A cross-sectional study was conducted in February 2022 among Tunisians infected with COVID-19 between March 2020 and February 2022, using an online self-administered questionnaire. We conducted univariate and multivariate analyses using binary stepwise logistic regression. Results A total of 1541 was selected from 1911 individuals. Comorbidities affected a quarter of the population (22.3%). Before the initial infection, 39.3% had received full vaccination, and 8.7% had received partial vaccination. By February 2022, the majority (82.9%) had received at least two vaccine doses. The reinfection rate was 30.6%. All vaccines prior to the first infection was identified as a protective factor against reinfection. Inactivated virus vaccinations were less likely to induce adverse effects. Conclusion ach vaccine has its own set of advantages and disadvantages: mRNA-based vaccines had a higher incidence of side effects but all vaccines provided better protection against reinfection.
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Affiliation(s)
- Souhir Chelly
- Faculty of Medicine of Sousse, Infection Prevention and Control Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
| | - Shayma Jaziri
- Faculty of Medicine of Sousse, Infection Prevention and Control Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
| | - Asma Ammar
- Faculty of Medicine of Sousse, Infection Prevention and Control Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
| | - Olfa Ezzi
- Faculty of Medicine of Sousse, Infection Prevention and Control Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
| | - Nour Douss
- Faculty of Medicine of Sousse, Infection Prevention and Control Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
| | - Sonia Saffar
- Faculty of Medicine of Sousse, Infection Prevention and Control Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
| | - Marouen Tritar
- Faculty of Medicine of Sousse, Infection Prevention and Control Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
| | - Mansour Njah
- Faculty of Medicine of Sousse, Infection Prevention and Control Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
| | - Mohamed Mahjoub
- Faculty of Medicine of Sousse, Infection Prevention and Control Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
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Saffar S, Fatemi I, Rahmani M, Hassanshahi J, Sahamsizadeh A, Allahtavakoli M, Sheibani V, Kaeidi A. The effect of epigallocatechin-3-gallate on morphine-induced memory impairments in rat: EGCG effects on morphine neurotoxicity. Hum Exp Toxicol 2020; 39:994-1002. [PMID: 32129083 DOI: 10.1177/0960327120909540] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
AIM OF STUDY This investigation evaluated the capacity of epigallocatechin-3-gallate (EGCG) as the main polyphenolic compound in the green tea extract against memory impairment and neurotoxicity in morphine-treated rats. METHODS To measure the EGCG effect (5 and 50 mg/kg, i.p., co-treated with morphine) on spatial learning and memory of morphine-administrated male Wistar rats (45 mg/kg, s.c., 4 weeks), the Morris water maze test was used. Some apoptotic protein levels (Bax, Bcl-2, and cleaved caspase 3) were evaluated in the hippocampus tissue by the Western blot test. Also, oxidative stress status (malondialdehyde level, glutathione peroxidase, and superoxide dismutase activity) was measured in hippocampus tissue. RESULTS The data presented that EGCG treatment (50 mg/kg) inhibited the morphine-induced memory deficits in rats. Also, EGCG administration reduced the apoptosis and oxidative stress in the hippocampus of morphine-treated rats. CONCLUSIONS Our data indicate that EGCG can improve memory in morphine-treated rats. Molecular mechanisms underlying the detected effects could be related to the prevention of apoptosis and oxidative stress in the hippocampus of morphine-treated rats.
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Affiliation(s)
- S Saffar
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Science, Kerman, Iran.,Physiology-Pharmacology Research Center, Research Institute of Basic Medical Sciences, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.,Department of Physiology and Pharmacology, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - I Fatemi
- Research Center of Tropical and Infectious Diseases, Kerman University of Medical Sciences, Kerman, Iran
| | - M Rahmani
- Physiology-Pharmacology Research Center, Research Institute of Basic Medical Sciences, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.,Department of Physiology and Pharmacology, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - J Hassanshahi
- Physiology-Pharmacology Research Center, Research Institute of Basic Medical Sciences, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.,Department of Physiology and Pharmacology, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - A Sahamsizadeh
- Physiology-Pharmacology Research Center, Research Institute of Basic Medical Sciences, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.,Department of Physiology and Pharmacology, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - M Allahtavakoli
- Physiology-Pharmacology Research Center, Research Institute of Basic Medical Sciences, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.,Department of Physiology and Pharmacology, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - V Sheibani
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Science, Kerman, Iran
| | - A Kaeidi
- Physiology-Pharmacology Research Center, Research Institute of Basic Medical Sciences, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.,Department of Physiology and Pharmacology, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
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Saffar S, Abdullah A, Gouttebroze S, Zhang ZL. Ultrasound-assisted handling force reduction during the solar silicon wafers production. Ultrasonics 2014; 54:1057-1064. [PMID: 24434116 DOI: 10.1016/j.ultras.2013.12.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 11/29/2013] [Accepted: 12/19/2013] [Indexed: 06/03/2023]
Abstract
Surface adhesion between wet wafers poses great challenges for silicon wafer handling. It has been shown that both the shear and normal handling forces of the solar silicon wafers can be dramatically reduced by using the ultrasound energy. Approximately 20 and 5 times reduction in horizontal and vertical forces were achieved by as low power as 10W, and a good agreement was found between the measured values and the predictions of a simple model for the effect of longitudinal vibration we developed.
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Affiliation(s)
- S Saffar
- Department of Structural Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
| | - A Abdullah
- Mechanical Engineering Faculty, Amirkabir University of Technology, 424, Hafez Avenue, Tehran, Iran
| | - S Gouttebroze
- SINTEF Materials and Chemistry, NO-0314 Oslo, Norway
| | - Z L Zhang
- Department of Structural Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
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Saffar S, Gouttebroze S, Zhang ZL. The Effect of Microstructure, Thickness Variation, and Crack on the Natural Frequency of Solar Silicon Wafers. J Sol Energy Eng 2014; 136:0110011-110018. [PMID: 24891752 PMCID: PMC3994764 DOI: 10.1115/1.4024248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 04/11/2013] [Indexed: 06/03/2023]
Abstract
Vibration is one of the most common loading modes during handling and transport of solar silicon wafers and has a great influence on the breakage rate. In order to control the breakage rate during handling and facilitate the optimization of the processing steps, it is important to understand the factors which influence the natural frequency of thin silicon wafers. In this study, we applied nonlinear finite element method to investigate the correlation of natural frequency of thin solar silicon wafer with material microstructures (grain size and grain orientation), thickness variation and crack geometry (position and size). It has been found that the natural frequency for anisotropic single crystal silicon wafer is a strong function of material orientation. Less than 10% thickness variation will have a negligible effect on natural frequency. It is also found out that cracks smaller than 20 mm have no dominant effect on the first five natural frequency modes anywhere in the silicon wafer.
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Affiliation(s)
- S Saffar
- Department of Structural Engineering, Norwegian University of Science and Technology , NO-7491 Trondheim , Norway
| | - S Gouttebroze
- SINTEF Materials and Chemistry , NO-0315 Oslo , Norway
| | - Z L Zhang
- Department of Structural Engineering, Norwegian University of Science and Technology , NO-7491 Trondheim , Norway e-mail:
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