Prevalence and risk factors of adverse effects after the first COVID-19 booster dose: evidence from Greece. Prevalencia y factores de riesgo de efectos adversos tras la primera dosis de refuerzo de COVID-19: Datos procedentes de Grecia

Background In general, COVID-19 vaccines are safe and effective, but minor adverse effects are common. However, adverse effects have not been measured in several countries including Greece. Objective: To estimate the prevalence of adverse effects after the first COVID-19 booster dose, and to identify possible risk factors. Material and methods: We conducted a cross-sectional study with a convenience sample in Greece during November 2022. We measured several adverse effects after the booster dose, such as fatigue, headaches, fever, chills, nausea, etc. We considered gender, age, chronic disease, self-assessment of health status, COVID-19 diagnóstico, and self-assessment of COVID-19 course as possible predictors of adverse effects. Results: In our sample, 96% developed at least one adverse effect. Half of the participants (50.2%) developed one to five adverse effects, 35.9% developed six to ten adverse effects, and 9.5% developed 11 to 16 adverse effects. Mean number of adverse effects was 5.5. The most frequent adverse effects were pain at the injection site (84.3%), fatigue (70.8%), muscle pain (61%), swelling at the injection site (55.2%), headache (49.8%), fever (42.9%), and chills (41%). Females developed more adverse effects than males (p < 0.001). The prevalence of adverse effects of COVID-19 vaccines was statistically significant and positively associated with the severity of COVID-19 among COVID-recovered individuals (p < 0.05). Moreover, younger age was associated with increased adverse effects (p < 0.001). Conclusions: Almost all participants in our study developed minor adverse effects after the booster dose. Female gender, COVID-19 patients with worse clinical course, and younger individuals experienced more often adverse effects.

Predictors of second COVID-19 booster dose or new COVID-19 vaccine hesitancy among nurses: A cross-sectional study.

AIMS AND OBJECTIVES: To assess the levels of second COVID-19 booster dose/new COVID-19 vaccine hesitancy among nurses and explore the potential predictors of vaccine hesitancy. BACKGROUND: COVID-19 full vaccination seems to be highly effective against highly contagious variants of SARS-CoV-2. Healthcare workers are at high-risk group since they have experienced high levels of COVID-19-associated morbidity and mortality. DESIGN: An on-line cross-sectional study was carried out in Greece in May 2022, using a self-administered questionnaire. METHODS: The study population included nurses in healthcare services who were fully vaccinated against COVID-19 at the time of study. We considered socio-demographic characteristics, COVID-19-related variables, and attitudes toward COVID-19 vaccination and pandemic as potential predictors of vaccine hesitancy. We applied the STROBE checklist in our study. RESULTS: Among 795 nurses, 30.9% were hesitant toward a second booster dose or a new COVID-19 vaccine. Independent predictors of hesitancy included lower educational level, absence of a chronic condition, good/very good self-perceived physical health, lack of flu vaccination during 2021, front-line nurses that provided healthcare to COVID-19 patients, nurses that had not been diagnosed with COVID-19 and nurses that had at least one relative/friend that has died from COVID-19. Moreover, increased compliance with hygiene measures, increased fear of a second booster dose/new COVID-19 vaccine and decreased trust in COVID-19 vaccination were associated with increased hesitancy. CONCLUSIONS: Our study shows that a significant percentage of nurses are hesitant toward a second booster dose/new COVID-19 vaccine. This initial hesitancy could be a barrier to efforts to control the COVID-19 pandemic. RELEVANCE TO CLINICAL PRACTICE: Nurses' role during the COVID-19 pandemic is essential since they are the front-line healthcare workers empowering the public with their passion and empathy. There is a need to communicate COVID-19 vaccine science in a way that is accessible to nurses in order to decrease COVID-19 vaccine hesitancy. PATIENT OR PUBLIC CONTRIBUTION: No patient or public contribution.

Prevalence and risk factors of adverse effects after the first COVID-19 booster dose: evidence from Greece.

Background: In general, COVID-19 vaccines are safe and effective, but minor adverse effects are common. However, adverse effects have not been measured in several countries including Greece. Objective: To estimate the prevalence of adverse effects after the first COVID-19 booster dose, and to identify possible risk factors. Material and methods: We conducted a cross-sectional study with a convenience sample in Greece during November 2022. We measured several adverse effects after the booster dose, such as fatigue, headaches, fever, chills, nausea, etc. We considered gender, age, chronic disease, self-assessment of health status, COVID-19 diagnóstico, and self-assessment of COVID-19 course as possible predictors of adverse effects. Results: In our sample, 96% developed at least one adverse effect. Half of the participants (50.2%) developed one to five adverse effects, 35.9% developed six to ten adverse effects, and 9.5% developed 11 to 16 adverse effects. Mean number of adverse effects was 5.5. The most frequent adverse effects were pain at the injection site (84.3%), fatigue (70.8%), muscle pain (61%), swelling at the injection site (55.2%), headache (49.8%), fever (42.9%), and chills (41%). Females developed more adverse effects than males (p < 0.001). The prevalence of adverse effects of COVID-19 vaccines was statistically significant and positively associated with the severity of COVID-19 among COVID-recovered individuals (p < 0.05). Moreover, younger age was associated with increased adverse effects (p < 0.001). Conclusions: Almost all participants in our study developed minor adverse effects after the booster dose. Female gender, COVID-19 patients with worse clinical course, and younger individuals experienced more often adverse effects.

Antecedentes: En general, las vacunas COVID-19 son seguras y eficaces, pero son frecuentes los efectos adversos leves. Sin embargo, los efectos adversos no se han medido en varios países, entre ellos Grecia. Objetivo: Estimar la prevalencia de efectos adversos tras la primera dosis de refuerzo de COVID-19 e identificar posibles factores de riesgo. Métodos: Realizamos un estudio transversal con una muestra de conveniencia en Grecia durante noviembre de 2022. Se midieron varios efectos adversos tras la dosis de refuerzo, fatiga, dolores de cabeza, fiebre, escalofríos, náuseas, etc. Consideramos el sexo, la edad, la enfermedad crónica, la autoevaluación del estado de salud, el diagnóstico de COVID-19 y la autoevaluación del curso de COVID-19 como posibles predictores de los efectos adversos. Resultados: En nuestra muestra, el 96% desarrolló al menos un efecto adverso. La mitad de los participantes (50,2%) desarrollaron de uno a cinco efectos adversos, el 35,9% desarrollaron de seis a diez efectos adversos, y el 9,5% desarrollaron de 11 a 16 efectos adversos. La media de efectos adversos fue de 5,5. Los efectos adversos más frecuentes fueron dolor en el punto de inyección (84,3%), fatiga (70,8%), dolor muscular (61%), hinchazón en el punto de inyección (55,2%), cefalea (49,8%), fiebre (42,9%) y escalofríos (41%). Las mujeres presentaron más efectos adversos que los hombres (p < 0,001). La prevalencia de los efectos adversos de las vacunas COVID-19 fue estadísticamente significativa y se asoció positivamente con la gravedad de COVID-19 entre los individuos recuperados de COVID (p < 0,05). Además, la menor edad se asoció con mayores efectos adversos (p < 0,001). Conclusiones: Casi todos los participantes en nuestro estudio desarrollaron efectos adversos menores tras la dosis de refuerzo. El sexo femenino, los pacientes de COVID-19 con peor evolución clínica y los individuos más jóvenes experimentaron efectos adversos con mayor frecuencia.

Predictors of COVID-19 Vaccination Uptake and Reasons for Decline of Vaccination: A Systematic Review

Background: Various COVID-19 vaccines with proven safety and effectiveness are available now but vaccine hesitancy remains a public threat. COVID-19 vaccines uptake appears to have an essential role in the successful control of the COVID-19 pandemic. Objective: To examine predictors of COVID-19 vaccination uptake and reasons for decline of vaccination. Methods: We followed the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines for this systematic review. We searched Medline, PubMed, Web of Science, Scopus, ProQuest, CINAHL, and a preprint service (medRxiv). We used the following key-words: vaccin·, COVID-19, and uptake. We included all types of studies (quantitative, qualitative, and mixed methods) reporting COVID-19 vaccination uptake. The review protocol was registered with PROSPERO (CRD42021267460). Results: Twelve studies met the inclusion and exclusion criteria. COVID-19 vaccination uptake ranged from 28.6% to 98% in the general population, while among healthcare workers ranged from 33.3% to 94.5%, and among patients ranged from 36% to 80%. The main predictors of COVID-19 vaccination uptake were male gender, white race, older age, higher socioeconomic status, higher self-perceived COVID-19 vulnerability, increased information about COVID-19 vaccines, and chronic illness. The most important reasons for decline of vaccination were concerns about the safety and effectiveness of vaccines, illness, medication, pregnancy, fertility, breastfeeding, religious reasons, ethical reasons, previous COVID-19 diagnosis, self-estimation that COVID-19 is not a severe disease, and limited knowledge about the vaccines. Conclusions: Several factors affect COVID-19 vaccination uptake, while various reasons affect people's decision to refuse to take a COVID-19 vaccine. These findings are essential to further enhance our understanding of COVID-19 vaccination uptake and design specific interventions. Given the high prevalence of COVID-19 vaccine hesitancy, our findings have major implications for the delivery of COVID-19 vaccination programmes in the public with special attention to people who are undecided or unlikely to take a COVID-19 vaccine.

Psychosocial Predictors of COVID-19 Vaccine Uptake among Pregnant Women: A Cross-Sectional Study in Greece.

An understanding of the factors associated with the COVID-19 vaccine uptake in pregnant women is paramount to persuade women to get vaccinated against COVID-19. We estimated the vaccination rate of pregnant women against COVID-19 and evaluated psychosocial factors associated with vaccine uptake among them. We conducted a cross-sectional study with a convenience sample. In particular, we investigated socio-demographic data of pregnant women (e.g., age, marital status, and educational level), COVID-19 related variables (e.g., previous COVID-19 diagnosis and worry about the side effects of COVID-19 vaccines), and stress due to COVID-19 (e.g., danger and contamination fears, fears about economic consequences, xenophobia, compulsive checking and reassurance seeking, and traumatic stress symptoms about COVID-19) as possible predictors of COVID-19 vaccine uptake. Among pregnant women, 58.6% had received a COVID-19 vaccine. The most important reasons that pregnant women were not vaccinated were doubts about the safety and effectiveness of the COVID-19 vaccines (31.4%), fear that COVID-19 vaccines could be harmful to the fetus (29.4%), and fear of adverse side effects of COVID-19 vaccines (29.4%). Increased danger and contamination fears, increased fears about economic consequences, and higher levels of trust in COVID-19 vaccines were related with vaccine uptake. On the other hand, increased compulsive checking and reassurance seeking and increased worry about the adverse side effects of COVID-19 vaccines reduced the likelihood of pregnant women being vaccinated. An understanding of the psychosocial factors associated with increased COVID-19 vaccine uptake in pregnant women could be helpful for policy makers and healthcare professionals in their efforts to persuade women to get vaccinated against COVID-19. There is a need for targeted educational campaigns to increase knowledge about COVID-19 vaccines and reduce vaccine hesitancy in pregnancy.

Seasonal Influenza Vaccine Intention among Nurses Who Have Been Fully Vaccinated against COVID-19: Evidence from Greece.

Seasonal influenza continues to be a significant public health issue causing hundreds of thousands of deaths annually. Nurses are a priority risk group for influenza vaccination and a high vaccine uptake rate among them is crucial to protect public health. Thus, the aim of our study was to estimate the levels of influenza vaccine acceptance, as well as its determinants, among nurses for the 2022/2023 season. We conducted a cross-sectional study with a convenience sample in Greece. We collected data via an online survey in September 2022. Most of the nurses in the study possessed a MSc/PhD diploma (56.2%) and had previously been infected by SARS-CoV-2 (70.3%). Among nurses, 57.3% were willing to accept the influenza vaccine, 19% were hesitant, and 23.7% were unwilling. Older age, higher levels of perceived support from significant others, and higher COVID-19-related physical exhaustion were positively related to influenza vaccination intention. In contrast, more side effects because of COVID-19 vaccination and higher levels of exhaustion due to measures taken against COVID-19 were negatively associated with vaccination intention. Since the influenza vaccination acceptance rate among nurses was moderate, policymakers should develop and implement measures tailored specifically to nurses in the context of the COVID-19 pandemic to decrease vaccine hesitancy.

Cross-sectional assessment of predictors for COVID-19 vaccine uptake: an online survey in Greece Evaluación transversal de los factores predictivos de la aceptación de la vacuna contra la COVID-19: Encuesta online en Grecia

Objective To estimate the percentage of the general population vaccinated against the COVID-19 and to investigate the factors associated with COVID-19 vaccine uptake. Material and methods We conducted an online cross-sectional study in Greece during August 2021. We included individuals over 18 years of age. Independent variables included socio-demographic data of the participants and attitudes towards COVID-19 vaccination and pandemic. Our outcome variable was COVID-19 vaccination status, measured through “yes/no” answers. Results Most participants had been vaccinated against the COVID-19 (87.8%). Multivariate analysis identified that increased age and a higher level of education were associated with an increased likelihood of COVID-19 vaccination. Also, participants working in health services, participants without a previous COVID-19 diagnóstico, and those with previous seasonal influenza vaccination history had a greater probability to take a COVID-19 vaccine. Additionally, increased self-perceived severity of COVID-19, knowledge regarding COVID-19, and trust in COVID-19 vaccines and scientists were associated with COVID-19 vaccine uptake. On the other hand, the likelihood of vaccination was lower for participants who were more concerned about the side effects of COVID-19 vaccination. Conclusions Understanding the factors affecting individuals' decision to take a COVID-19 vaccine is essential to improve the COVID-19 vaccination coverage rate. Policymakers and scientists should scale up their efforts to increase the COVID-19 vaccination rate among specific population groups such as young people, people with a low level of education, etc.

COVID-19 Vaccine Uptake among Healthcare Workers: A Systematic Review and Meta-Analysis.

The vaccine-induced immunity of healthcare workers (HCWs) is crucial to controlling the COVID-19 pandemic. Therefore, we conducted a systematic review and meta-analysis to assess the COVID-19 vaccine uptake among HCWs worldwide and to identify predictors of vaccination. We searched Scopus, Web of Science, Medline, PubMed, ProQuest, CINAHL, and medRxiv up to 25 August 2022. We applied the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines. We found 25 studies including 491,624 vaccinated HCWs, while the full sample included 555,561 HCWs. The overall proportion of vaccinated HCWs was 77.3%. Vaccine uptake for studies that were conducted in North America (85.6%) was higher than the proportion for studies that were conducted in Asia (79.5%), Europe (72.8%), and Africa (65.6%). The overall prevalence of COVID-19 vaccine uptake was 83.6% and 77.4% for physicians and nurses, respectively. Older age, white race, physicians' profession, seasonal influenza vaccine, direct COVID-19 patient care, and confidence in COVID-19 vaccine safety and effectiveness were positive predictors of vaccine uptake, while history of SARS-CoV-2 infection was a negative predictor. Deep understanding of the factors that influence HCWs' decisions to receive a COVID-19 vaccine is critical to implementing tailored communication strategies for HCWs who are at risk for not getting vaccinated.

Predictors of Real-World Parents' Acceptance to Vaccinate Their Children Against the COVID-19.

Background: As the COVID-19 pandemic continues to threaten public health, the vaccination of children against the disease appears to be a key factor to control the pandemic. Our aim was to investigate the prevalence of parents who have vaccinated their children against the COVID-19 and the factors influencing this decision. Materials and Methods: We conducted a web-based cross-sectional study in Greece during the first week of September 2021. The study questionnaire was distributed through social media and a convenience sample was obtained. Only parents with children aged 12-17 years old could participate in the study. We collected socio-demographic data of parents and we measured their attitudes towards vaccination and COVID-19 pandemic. Results: Study population included 656 parents. Regarding vaccination, 27.1% of parents had their children vaccinated against the COVID-19, while almost all children had a complete vaccination history (98.9%). The most important reasons for decline of COVID-19 vaccination were doubts about the safety and effectiveness of COVID-19 vaccines (45.3%) and fear of side effects (36.6%). Regarding the information about the COVID-19 vaccines, parents showed more trust in family doctors than in scientists and the government. We found that increased parents' age, increased trust in COVID-19 vaccines, and positive attitude of parents towards vaccination had a positive effect on children's vaccination. Conclusions: Understanding the factors influencing parents' decision to vaccinate their children against the COVID-19 is crucial to increase the COVID-19 vaccination coverage rate. Implementation of public health policies is necessary to spread knowledge about COVID-19 vaccines and to regain vaccine confidence.

Cross-sectional assessment of predictors for COVID-19 vaccine uptake: an online survey in Greece.

Objective: To estimate the percentage of the general population vaccinated against the COVID-19 and to investigate the factors associated with COVID-19 vaccine uptake. Material and methods: We conducted an online cross-sectional study in Greece during August 2021. We included individuals over 18 years of age. Independent variables included socio-demographic data of the participants and attitudes towards COVID-19 vaccination and pandemic. Our outcome variable was COVID-19 vaccination status, measured through "yes/no" answers. Results: Most participants had been vaccinated against the COVID-19 (87.8%). Multivariate analysis identified that increased age and a higher level of education were associated with an increased likelihood of COVID-19 vaccination. Also, participants working in health services, participants without a previous COVID-19 diagnóstico, and those with previous seasonal influenza vaccination history had a greater probability to take a COVID-19 vaccine. Additionally, increased self-perceived severity of COVID-19, knowledge regarding COVID-19, and trust in COVID-19 vaccines and scientists were associated with COVID-19 vaccine uptake. On the other hand, the likelihood of vaccination was lower for participants who were more concerned about the side effects of COVID-19 vaccination. Conclusions: Understanding the factors affecting individuals' decision to take a COVID-19 vaccine is essential to improve the COVID-19 vaccination coverage rate. Policymakers and scientists should scale up their efforts to increase the COVID-19 vaccination rate among specific population groups such as young people, people with a low level of education, etc.

Objetivo: Calcular el porcentaje de población general vacunada contra la COVID-19 e investigar los factores asociados a la aceptación de dicha vacuna. Material y métodos: Realizamos un estudio transversal online en Grecia durante el mes de agosto de 2021, en el que incluimos a individuos mayores de 18 años de edad. Las variables independientes incluyeron los datos sociodemográficos de los participantes y las actitudes hacia la vacunación y la pandemia de COVID-19. Nuestra variable del resultado fue la situación de vacunación contra la COVID-19, medida mediante respuestas "sí/no". Resultados: La mayoría de los participantes habían sido vacunados contra la COVID-19 (87,8%). El análisis multivariante identificó que el incremento de la edad y el mayor nivel educativo estaban asociados a un aumento de la probabilidad de vacunarse contra la COVID-19. De igual modo, los participantes que trabajaban en servicios sociales, aquellos participantes sin un diagnóstico previo de COVID-19, y aquellos con historial previo de vacuna contra la gripe estacional tenían una mayor probabilidad de vacunarse contra la COVID-19. Además, el incremento de la gravedad autopercibida de la COVID-19, el conocimiento sobre la enfermedad, y la confianza en las vacunas contra la COVID-19 y en los científicos estuvieron asociados a la aceptación de la vacuna. Por otro lado, la probabilidad de vacunarse fue menor en los participantes más preocupados de los efectos secundarios de la vacuna contra la COVID-19. Conclusiones: Comprender los factores que afectan a la decisión de los individuos sobre la vacunación contra la COVID-19 es fundamental para mejorar la tasa de cobertura de dicha vacunación. Los responsables políticos y los científicos deberán redoblar sus esfuerzos para incrementar la tasa de vacunación contra la COVID-19 entre los grupos de población específicos tales como la gente joven, las personas con un bajo nivel educativo, etc.

First COVID-19 Booster Dose in the General Population: A Systematic Review and Meta-Analysis of Willingness and Its Predictors.

The emergence of breakthrough infections and new highly contagious variants of SARS-CoV-2 threaten the immunization in individuals who had completed the primary COVID-19 vaccination. This systematic review and meta-analysis investigated, for the first time, acceptance of the first COVID-19 booster dose and its associated factors among fully vaccinated individuals. We followed the PRISMA guidelines. We searched Scopus, Web of Science, Medline, PubMed, ProQuest, CINAHL and medrxiv from inception to 21 May 2022. We found 14 studies including 104,047 fully vaccinated individuals. The prevalence of individuals who intend to accept a booster was 79.0%, while the prevalence of unsure individuals was 12.6%, and the prevalence of individuals that intend to refuse a booster was 14.3%. The main predictors of willingness were older age, flu vaccination in the previous season, and confidence in COVID-19 vaccination. The most important reasons for decline were adverse reactions and discomfort experienced after previous COVID-19 vaccine doses and concerns for serious adverse reactions to COVID-19 booster doses. Considering the burden of COVID-19, a high acceptance rate of booster doses could be critical in controlling the pandemic. Our findings are innovative and could help policymakers to design and implement specific COVID-19 vaccination programs in order to decrease booster vaccine hesitancy.

Predictors of Willingness of the General Public to Receive a Second COVID-19 Booster Dose or a New COVID-19 Vaccine: A Cross-Sectional Study in Greece.

Given the concerns of waning immunity from the primary COVID-19 vaccines and the first booster dose, we conducted an online cross-sectional study in May 2022 to investigate willingness to receive a second COVID-19 booster dose or a new COVID-19 vaccine and its associated factors. Overall, 62% of the participants were willing to be vaccinated, 25.8% were unsure, and 12.3% were unwilling to be vaccinated. The main reasons against accepting a second COVID-19 booster dose/new COVID-19 vaccine were concerns about the side effects and the effectiveness and the opinion that further vaccination is unnecessary. Males, younger individuals, participants without a previous COVID-19 diagnosis, and those with good/very good self-perceived physical health were significantly more frequently willing to receive a second COVID-19 booster dose or a new COVID-19 vaccine. Additionally, increased fear of the COVID-19, increased trust in COVID-19 vaccinations, and decreased fear of a second booster dose or a new COVID-19 vaccine was associated with increased willingness. Our results show some hesitancy and unwillingness toward further COVID-19 vaccination and indicate that the fear of COVID-19 and trust in COVID-19 vaccination affects public opinion.

Cross-Cultural Adaptation and Validation of the "COVID Stress Scales" in Greek

Background: During the COVID-19 pandemic, several instruments were developed to measure the psychological impact of COVID-19, such as fear, anxiety, post-traumatic stress, phobia, etc. Objective: To adapt cross-cultural and validate the "COVID Stress Scales" in Greek. Methods: We conducted a cross-sectional study with 200 participants between November 2021 to February 2022. All participants were adults, and a convenience sample was obtained. We applied the forward-backward translation method to create a Greek version of the "COVID Stress Scales". We assessed reliability of the questionnaire with test-retest method in a 10-day window, and we assessed validity of the questionnaire with exploratory factor analysis. Results: Our five-factor model explained 72% of the variance and totally confirmed the factors of the initial "COVID Stress Scales". In particular, we found the following five factors: (a) COVID-19 danger and contamination (eleven items), (b) COVID-19 socioeconomic consequences (six items), (c) COVID-19 xenophobia (six items), (d) COVID-19 traumatic stress (six items), and (e) COVID-19 compulsive checking (six items). Cronbach's coefficients alpha for the five factors that emerged from the exploratory factor analysis were greater than 0.89 indicating an excellent internal reliability. Conclusions: We found that the "COVID Stress Scales" is a reliable and valid tool to measure stress due to the COVID-19 in the Greek population.

Development and validation of a questionnaire to measure attitudes toward COVID-19 vaccination and pandemic

Background: Accurate measurement of individuals' attitudes toward COVID-19 vaccination and pandemic is critical to understand the way that people respond during a major crisis such as the COVID-19 pandemic. Objective: Development and validation of a questionnaire assessing attitudes toward COVID-19 vaccination Methods: We performed a reliability and validity study in a sample of the general population in Greece. Data were collected online through social media between 15 August and 7 September 2021. Thus, a convenience sample was obtained. Reliability and validity of the questionnaire were assessed with a Delphi study, an exploratory factor analysis, and a test-retest study. Also, we calculated Cronbach's coefficient alpha for the factors that emerged from the exploratory factor analysis. Results: The final study included 1959 adults from the general population in Greece. Our four-factor model explained 73% of the variance and confirmed out initial hypothesis regarding the factors of the questionnaire. In particular, we found the following four factors: (a) fear against the COVID-19 (five items), (b) information regarding the COVID-19 (two items), (c) compliance with hygiene measures (two items), and (d) trust in COVID-19 vaccination (seven items). Cronbach's coefficients alpha for the four factors that emerged from the exploratory factor analysis were greater than 0.82. Pearson's correlation coefficients for the 16 items and the four factors were greater than 0.67 (p-value<0.001 in all cases). Conclusions: The developmend of a reliable and valid questionnaire measuring attitudes toward COVID-19 vaccination and pandemic. Further studies are needed to expand our knowledge and infer more valid results.

Uptake of COVID-19 Vaccines among Pregnant Women: A Systematic Review and Meta-Analysis.

Mass vaccination against COVID-19 is essential to control the pandemic. COVID-19 vaccines are now recommended during pregnancy to prevent adverse outcomes. With this review, we aimed to evaluate the evidence in the literature regarding the uptake of COVID-19 vaccinations among pregnant women. A comprehensive search was performed in PubMed, Medline, Scopus, ProQuest, Web of Science, CINAHL, and medRxiv from inception to 23 March 2022. We performed a meta-analysis to estimate the overall proportion of pregnant women vaccinated against COVID-19. We found 11 studies including 703,004 pregnant women. The overall proportion of pregnant women vaccinated against COVID-19 was 27.5% (95% CI: 18.8-37.0%). Predictors of COVID-19 vaccination uptake were older age, ethnicity, race, trust in COVID-19 vaccines, and fear of COVID-19 during pregnancy. Mistrust in the government, diagnosis of COVID-19 during pregnancy, and fears about the safety and side effects of COVID-19 vaccines were reasons for declining vaccination. The global COVID-19 vaccination prevalence in pregnant women is low. A large gap exists in the literature on the factors influencing the decision of pregnant women to be vaccinated against COVID-19. Targeted information campaigns are essential to increase vaccine literacy among pregnant women.

Predictors of COVID-19 Vaccine Uptake in Healthcare Workers: A Cross-Sectional Study in Greece.

OBJECTIVE: We assessed the uptake of a COVID-19 vaccine and associated factors in a sample of healthcare workers (HCWs). METHODS: An on-line cross-sectional study with 885 HCWs was conducted in Greece during August 2021. We measured socio-demographic data of HCWs and attitudes towards vaccination and the COVID-19 pandemic. A convenience sample was used since the questionnaire was distributed through social media and emails. RESULTS: The majority of HCWs were vaccinated against the COVID-19 (91.5%). Females and HCWs with a history of seasonal influenza vaccination had a greater probability to get a COVID-19 vaccine. Also, increased self-perceived knowledge regarding the COVID-19 pandemic and increased trust in COVID-19 vaccines were associated with COVID-19 vaccine uptake. CONCLUSIONS: Policymakers and scientists should develop novel strategies to improve COVID-19 vaccine uptake among HCWs.

Development and Validation of a Questionnaire to Measure Attitudes Toward COVID-19 Vaccination and Pandemic

Background: Accurate measurement of individuals' attitudes toward COVID-19 vaccination and pandemic is critical to understand the way that people respond during a major crisis such as the COVID-19 pandemic. Objective: Development and validation of a questionnaire to assess attitudes toward COVID-19 vaccination and pandemic Methods: A reliability and validity study was performed in convenience sample of the population in Greece. Data were collected online through social media between 15 August and 7 September 2021. Reliability and validity of the questionnaire were assessed with a Delphi study, an exploratory factor analysis, and a testretest study. Also, we calculated Cronbach's coefficient alpha for the factors that emerged from the exploratory factor analysis. Results: 1959 people included in the study, adults from the population in Greece. Our four-factor model explained 73% of the variance and confirmed out initial hypothesis regarding the factors of the questionnaire. In particular, we found four factors: (a) fear against the COVID-19 (five items), (b) information regarding the COVID-19 (two items), (c) compliance with hygiene measures (two items), and (d) trust in COVID-19 vaccination (seven items). Cronbach's coefficients alpha for the four factors that emerged from the exploratory factor analysis were greater than 0.82. Pearson's correlation coefficients for the 16 items and the four factors were greater than 0.67 (p-value<0.001 in all cases). Conclusions: A reliable and valid questionnaire was developed to measure attitudes toward COVID-19 vaccination and pandemic. Further studies are neded to expand our knowledge and infer more valid results.

Willingness, refusal and influential factors of parents to vaccinate their children against the COVID-19: A systematic review and meta-analysis.

We aimed to estimate parents' willingness and refusal to vaccinate their children against the COVID-19, and to investigate the predictors for their decision. We followed the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines. We searched Scopus, Web of Science, Medline, PubMed, CINAHL and medrxiv from inception to December 12, 2021. We applied a random effect model to estimate pooled effects since the heterogeneity was very high. We used subgroup analysis and metaregression analysis to explore sources of heterogeneity. We found 44 studies including 317,055 parents. The overall proportion of parents that intend to vaccinate their children against the COVID-19 was 60.1%, while the proportion of parents that refuse to vaccinate their children was 22.9% and the proportion of unsure parents was 25.8%. The main predictors of parents' intention to vaccinate their children were fathers, older age of parents, higher income, higher levels of perceived threat from the COVID-19, and positive attitudes towards vaccination (e.g. children's complete vaccination history, history of children's and parents' vaccination against influenza, confidence in vaccines and COVID-19 vaccines, and COVID-19 vaccine uptake among parents). Parents' willingness to vaccinate their children against the COVID-19 is moderate and several factors affect this decision. Understanding parental COVID-19 vaccine hesitancy does help policy makers to change the stereotypes and establish broad community COVID-19 vaccination. Identification of the factors that affect parents' willingness to vaccinate their children against COVID-19 will provide opportunities to enhance parents' trust in the COVID-19 vaccines and optimize children's uptake of a COVID-19 vaccine.

Personal Protective Equipment Use among Health Care Workers during the COVID-19 Pandemic: A Comparative Study in England and Greece

Introduction: Personal protective equipment (PPE) use among health care workers (HCWs) during the coronavirus disease 2019 (COVID-19) pandemic has increased significantly creating various difficulties. Aim: To examine HCWs' experiences, practice, and attitudes regarding PPE during the COVID-19 pandemic in England and Greece. Methods: A cross-sectional study with a convenience sample was conducted during April 2021. Due to the circumstances during the COVID-19 pandemic, we collected data through google forms using a snowball method. We created a google form with the study questionnaire asking HCWs to complete it in an anonymous way. We collected the following demographic data: gender, age, clinical experience, country of work, and profession. Also, we used 21 questions to assess HCWs experiences, practice, and attitudes regarding PPE during the COVID-19 pandemic. Results: Study population included 87 HCWs from Greece (51.8%) and 81 from England (48.2%) with a mean age of 38.1 years. Significant percentages of HCWs stated that PPE was insufficient (36.4%), training regarding PPE use was limited (49.1%), and information regarding PPE use was limited (43.1%). 91.1. Almost all the HCWs knew to use PPE (97.6%). The greatest difficulties that HCWs faced were the following: development of physical problems, difficulty in communication, difficulty of physical movements, lack of adequate personal protective equipment, lack of organizational support, and lack of knowledge of protocols/instructions for the correct use of the equipment. HCWs in England considered more often that: PPE is sufficient (p<0.001), the availability of PPE is increased due to the COVID-19 pandemic (p<0.001), and know to use appropriate PPE (p=0.013). Training and information regarding PPE use were more often in England (p=0.003 and p<0.001 respectively). Also, lack of adequate PPE (p<0.001), knowledge of using PPE (p=0.002), protocols/instructions for the correct use of the PPE (p<0.001), knowledge of protocols/instructions for the correct use of the PPE (p<0.001), organizational support (p<0.001), motivation (p<0.001), and safety culture in work (p<0.001) were more often in Greece. Conclusions: Since the COVID-19 pandemic continuous to threat public health, creating a safety culture work environment for HCWs in clinical settings is essential to decrease the spread of SARS-CoV-2, protect HCWs and their patients, and increase work performance.