Vaccine Literacy and Vaccination: A Systematic Review

Validation of an Arabic tool for assessing vaccination literacy: A factor and Rasch analysis

Vaccine literacy is a significant part of health literacy. Although several tools have been developed to assess vaccine literacy, such tools are lacking in Arabic. Validating an Arabic version of a tool that evaluates vaccine literacy is critically important, as it would aid in understanding the decision-making process regarding vaccinations among individuals in Arabic-speaking countries. Therefore, the current study aimed to validate an Arabic tool for assessing vaccine literacy in adult vaccination. An online questionnaire was distributed to people throughout Jordan by sharing the questionnaire link via various social media platforms. The reliability and validity of the Arabic version of the vaccination literacy assessment tool (HLVa-Ar) were evaluated using factor analysis and Rasch analyses. The two-factor model generated fit indices were in the acceptable range (χ2/df = 2.48, RMSEA = 0.06, SRMR = 0.05, GFI = 0.94, CFI = 0.97, and TLI = 0.96). Cronbach's alpha for functional Vaccination literacy (VL) and interactive/critical VL were 0.91 and 0.88 respectively. The Rasch analysis indicated acceptable infit/outfit values and high item and person separation reliabilities for the two factors (0.852, 0.868, and 0.771, 0.818 respectively). Overall, the 420 participants displayed a good understanding of the general benefits and importance of vaccination. The HLVa-Ar was shown to be a valid and reliable tool that portrayed a wide range of vaccination literacy levels in the studied sample and provided valuable insights into participants' vaccination knowledge. The findings emphasize the need for developing targeted strategies to improve vaccination literacy and increase vaccination rates.

How well does vaccine literacy predict intention to vaccinate and vaccination status? A systematic review and meta-analysis

This review quantified the association of vaccine literacy (VL) and vaccination intention and status. PubMed, Scopus, and Web of Science were searched. Any study, published until December 2022, that investigated the associations of interest were eligible. For each outcome, articles were grouped according to the vaccine administrated and results were narratively synthesized. Inverse-variance random-effect models were used to compare standardized mean values in VL domain(s) between the two groups: individuals willing vs. unwilling to get vaccinated, and individuals vaccinated vs. unvaccinated. This review of 18 studies shows that VL strongly predicts the vaccination intention while its association with vaccination status is attenuated and barely significant, suggesting that other factors influence the actual vaccination uptake. However, given the scarce evidence available, the heterogeneity in the methods applied and some limitations of the studies included, further research should be conducted to confirm the role of VL in the vaccination decision-making process.

Knowledge, attitudes, and perceptions of influenza vaccine among pregnant women in Minhang District, Shanghai

This study aimed to assess the attitudes and willingness of pregnant women to receive the influenza vaccine and the factors influencing their decisions. A sample survey was conducted among pregnant women receiving prenatal care at various medical institutions in Minhang District, Shanghai, from March to June 2023. The survey included inquiries about demographic information, knowledge, and perception of influenza disease and influenza vaccine. Logistic regression models and chi-square tests were used to analyze the data. 6.9% (78/1125) of participants considered receiving the influenza vaccine during pregnancy. Participants with graduate education or above (OR = 4.632, 95%CI: 1.046-20.517), non-office workers (OR = 2.784, 95%CI: 1.560-4.970), and participants whose spouses were not office workers (OR = 0.518, 95% CI: 0.294-0.913) were significantly associated with high intent to vaccinate. Participants with superior knowledge (>30 points) exhibited greater willingness (p < .001). Participants who viewed post-influenza symptoms as mild had a significantly lower willingness to vaccinate during pregnancy (2.3%), compared to those who disagreed (p = .015). Conversely, those recognizing a heightened risk of hospitalization due to respiratory diseases in pregnant women post-influenza were significantly more inclined to vaccinate during pregnancy (8.8%) (p = .007). Participants recognizing benefits uniformly expressed willingness to receive the influenza vaccine during pregnancy (p < .001), while those perceiving barriers uniformly rejected vaccination (p < .001). Higher education, non-office worker status, and having an office worker spouse correlate with greater willingness to receive the influenza vaccine during pregnancy. Enhanced knowledge and accurate perceptions of influenza and its vaccine influenced willingness. Accumulating knowledge about influenza and its vaccine fosters accurate perceptions. Notably, overall willingness to vaccinate during pregnancy remains low, likely due to safety concerns, and lack of accurate perceptions. Targeted health education, improved communication between healthcare providers and pregnant women, and campaigns highlighting vaccine benefits for mothers and children are essential.

COVID-19 vaccine uptake among children and adolescents in Norway: A comprehensive registry-based cohort study of over 800,000 individuals

Factors related with COVID-19 vaccine uptake in children and adolescents in Norway remain unclear, despite this being useful knowledge for future pandemic preparedness. This study aimed to comprehensively examine individual and familial factors associated with vaccine uptake in children and adolescents in Norway. We utilized nationwide registry-data from various health registries and Statistics Norway, encompassing all children and adolescents living in Norway during the pandemic, until 31-Dec-2022. Vaccine uptake is defined as receiving at least one dose of COVID-19 vaccine. We employed a forward stepwise logistic regression model and a random forest machine-learning algorithm to explore the relationship between vaccine uptake and socio-cultural, demographic, and health-related factors. We included 423,548 5-11-year-olds, 269,830 12-15-year-olds, and 120,854 16-17-year-olds. Vaccine uptake in these three groups was respectively 2.6 %, 73.3 %, and 87.3 %. Factors associated with vaccine uptake varied by age group. In youngest children, immigrant background (Odds-ratio (OR) = 1.58, 95 % confidence interval (CI) (1.14-2.19)), born extremely preterm (OR = 2.38, 95 % CI (1.60-3.54)), having risk of severe COVID-19 (OR = 5.40, 95 % CI (4.69-6.23) and maternal COVID-19 vaccination (OR = 6.34, 95 % CI (5.35-7.53)) were positively associated with vaccine uptake. The latter two factors were also strongly, positively associated with vaccine uptake in 12-15-year-olds, while previous SARS-CoV-2 infection was negatively associated (OR = 0.12, 95 % CI (0.11-0.14). Similar findings were observed in 16-17-year-olds. COVID-19 vaccine uptake differed markedly by age group, and major associated factors included socio-demographics and parental COVID-19 vaccination status, prior SARS-CoV-2 infection, but also being born premature and having moderate or high risk of severe COVID-19.

Inequities in human papillomavirus vaccination among children aged 9-14 years old under constrained vaccine supply in China

BACKGROUND

Inequities in access to human papillomavirus (HPV) vaccine are becoming a growing critical issue globally. Few studies investigate the factors determining HPV vaccine uptake disparities when vaccine supply is constrained, especially in low- and middle-income countries. The aim of this study was to investigate inequities of HPV vaccination and related factors under the constrained vaccine supply in China.

METHODS

A cross-sectional survey was conducted in a developed eastern coastal province and a developing western one in China between November and December 2022. Employing multistage stratified cluster random sampling, the study collected data from parents of children aged 9-14. Mixed-effects logistic regression models with school units as random effects were used for analysis.

RESULTS

From 4,127 eligible parents (as vaccine decision makers for girls), 1,346 (32.6%) intended to vaccinate their daughters against HPV, of which 836 (62.1%) attempted to schedule a vaccination appointment. Only 16.4% succeeded in booking an appointment. More than half of the intended parents expected the imported 9-valent HPV vaccine. There were significant disparities in HPV vaccine awareness, intention, and vaccination behavior across educational, income, geographic, ethnic, gender, and health literacy levels. Vaccine awareness and intentions were higher among parents with higher socioeconomic status; however, girls from lower socioeconomic families were more likely to receive the HPV vaccine and had a higher domestically produced vaccination rate. Significant disparities exist in vaccination intentions and actual vaccination behaviors, primarily due to large supply constraints of the HPV vaccine.

CONCLUSIONS

Sustained health education campaigns are needed to raise awareness of the HPV vaccine, improve health literacy, and decrease over-preference for the 9-valent HPV vaccine. A mother's HPV vaccination behavior was positively associated with increased intention and actual vaccination behavior for her daughter. This study advocates for complementary cervical cancer prevention programs targeting both mothers and daughters.

Higher educational attainment associated with higher confidence in influenza vaccination in Norway

AIMS

To explore public confidence in influenza vaccination through the use of attitudinal indicators, and study whether educational attainment is related to attitudes towards influenza vaccination.

METHODS

Confidence in influenza vaccination was measured with three questions adapted from the Vaccine Confidence Project. These questions have been included in four study years of a Norwegian nationally representative telephone survey that cover influenza seasons 2016/17, 2019/20, 2020/21 and 2021/22. Over these four years, a total of 8 436 individuals aged 18-79 years responded to the survey and are included in the analysis. Risk differences (RDs) with 95 % confidence intervals were estimated using multivariable Poisson regression.

RESULTS

Influenza vaccine confidence increased over time, with approximately 80 % of the general population expressing trust in the vaccine in the 2021/22 season. There was a tendency towards higher confidence in the oldest age group (65-79 years). Moreover, confidence increased with increasing educational attainment. The proportion of participants who agreed that influenza vaccine is compatible with their basic values was close to 20 percentage points lower among those with only compulsory education than among those with higher education at graduate level, RD = -18.4 % (95 % CI -21.4 % to -15.5 %). Educational attainment was consistently associated with influenza vaccine confidence in all seasons, among risk groups 18-64 years, and among health care workers.

CONCLUSIONS

We observed an increase in confidence in influenza vaccination over the seasons examined in the study. However, the increase has not been equal in all groups and there is a clear educational gradient in influenza vaccine confidence. These findings indicate that despite efforts to increase influenza coverage over several years, the implemented measures have failed to reach all parts of the population.

Perspectives in the Development of Tools to Assess Vaccine Literacy

Vaccine literacy (VL) is the ability to find, understand, and evaluate vaccination-related information to make appropriate decisions about immunization. The tools developed so far for its evaluation have produced consistent results. However, some dimensions may be underestimated due to the complexity of factors influencing VL. Moreover, the heterogeneity of methods used in studies employing these tools hinders a comprehensive understanding of its role even more. To overcome these limitations, a path has been sought to propose new instruments. This has necessitated updating earlier literature reviews on VL and related tools, exploring its relationship with vaccine hesitancy (VH), and examining associated variables like beliefs, attitudes, and behaviors towards immunization. Based on the current literature, and supported by the re-analysis of a dataset from an earlier study, we propose a theoretical framework to serve as the foundation for creating future assessment tools. These instruments should not only evaluate the psychological factors underlying the motivational aspect of VL, but also encompass knowledge and competencies. The positioning of VL in the framework at the intersection between sociodemographic antecedents and attitudes, leading to behaviors and outcomes, explains why and how VL can directly or indirectly influence vaccination decisions by countering VH and operating at personal, as well as at organizational and community levels.

Rates and determinants of Rotavirus vaccine uptake among children in Italy: a cross-sectional study within the 2022 OBVIOUS* project

INTRODUCTION

The World Health Organization defines rotavirus as among the most severe causes of viral gastroenteritis affecting children under 5 year old. Italy and other European countries do not release disaggregated data on rotavirus vaccination coverage. This study aimed to assess the uptake and drivers of rotavirus vaccination in Italy.

METHODS

We administered a survey to 10,000 Italian citizens recruited via an online panel and proportionate to key demographic strata. We examined rotavirus vaccine uptake among parents whose youngest child was aged 6 weeks to 4 years, their sociodemographic characteristics, their beliefs about vaccine administration, and who recommended the rotavirus vaccination.

RESULTS

A total of 711 respondents met the inclusion criteria for the rotavirus vaccine questionnaire. The uptake was estimated at 60.3% nationwide (66.4% among mothers and 50.2% among fathers). Being a mother and living in cities/suburbs was significantly associated with a higher likelihood of vaccine uptake, while fathers were more likely to be uncertain of their children's vaccine status. Living in Central Italy and having friends/relatives opposed to vaccination were found to be significantly associated with a lower likelihood of vaccine uptake, while parents' education level and children's demographics were not found to correlate with any outcomes. In 90.3% of cases, the rotavirus vaccination was recalled as being recommended by a paediatrician.

CONCLUSIONS

Consistent collection of behavioural preferences and socioeconomic characteristics of recipients of rotavirus vaccine campaigns, their epidemiological information, cost-benefit, and national policy data are crucial for designing effective vaccination strategies in Italy and other European countries with similar social profiles to reach the target uptake.

Vaccination Guidelines for Pregnant Women: Addressing COVID-19 and the Omicron Variant

Vaccinations are an essential element of public health programs around the world, which have a major impact on morbidity, mortality, and costs of the health care system. In recent years, with a better understanding of the effectiveness and safety of vaccinations, many recommendations have been developed for administering vaccines to adults. Countless physiological changes occur during pregnancy, including those affecting the immune system. Pregnant women are at increased risk of developing infections and resulting complications. According to research, vaccines are immunogenic and safe for pregnant women. Pregnancy is not an absolute contraindication to vaccination. After administration of vaccines to pregnant women, the concentration of antibodies increases, which can be transferred to the child in the second and third trimesters of pregnancy and provide protection in the first months of life. The Advisory Committee on Immunization Practices (ACIP), guidelines of the Centers for Disease Control and Prevention (CDC), and the American College of Obstetrics and Gynecology (ACOG) unanimously recommend vaccination of pregnant women if a safe vaccine is available and there is a risk of exposure of the woman to a disease that threatens herself or her developing baby. In everyday clinical practice, medical professionals should provide their patients with the necessary information on vaccinations, which may contribute to greater awareness and implementation of vaccinations. This article aims to review current global recommendations for the vaccination of pregnant and breastfeeding women, including against the Omicron variants of SARS-CoV-2.

Acceptance of influenza vaccination and associated factors among teachers in China: A cross-sectional study based on health belief model

Teachers played an important role on the transmission of influenza in schools and communities. The study aims to investigate the influenza vaccination coverage and the factors determining flu vaccination acceptance among teachers in Hangzhou, China. A total of 1039 junior high school teachers in Hangzhou were recruited. The self-made questionnaire was used to investigate the influenza vaccine coverage among teachers and the influencing factors of influenza vaccination acceptance. Univariate analysis using the chi-square test and multivariable analysis using binary logistic regression were conducted to determine the relative predictors. The Influenza vaccine coverage among teachers was 5.9% (62/1039). 52.9% of teachers had the intention to receive influenza vaccine, 25.3% (247/977)/21.8% (213/977) of participants was hesitant/did not have the intention to get influenza vaccine. The top three sources for teachers to gain knowledge about influenza were website (72%), TV/radio (66.1%) and social media (58%). Whether get influenza vaccination before, knowledge about influenza and influenza vaccine, the beliefs for the likelihood of catching flu, the severity of getting flu, the effectiveness of influenza vaccine, the possibility of side effects after vaccination, and the troublesome of vaccination, doctors' recommendation, as well as the situation of vaccination among other teachers were the associated factors of influenza vaccination acceptance. The influenza vaccination coverage was low but the intentions were relatively high among junior high school teachers. Future research should focus on the relationship between vaccination acceptance and behavior to increase influenza vaccination rates.

Lessons learned from COVID-19 vaccination implementation: How psychological antecedents of vaccinations mediate the relationship between vaccine literacy and vaccine hesitancy

BACKGROUND

Enhancing the public's vaccine literacy is critical for curbing vaccine hesitancy and enhancing society's pandemic preparedness, particularly in an era of infodemic. Evidence on vaccine literacy as an influencing factor of hesitancy is scarce. Lessons could be learned from COVID-19 vaccination implementation. Taking the COVID-19 vaccines as an example, the current study aimed to examine the relationship between vaccine literacy and hesitancy and the mediating role of psychological antecedents of vaccination on the relationship.

METHODS

A baseline online questionnaire survey among the general public in China based on quota sampling was conducted in April 2021 to measure participants' vaccine literacy, psychological antecedents of vaccination, COVID-19 vaccination status, and vaccine hesitancy. A follow-up online survey tracked the updated COVID-19 vaccination status among those who hadn't taken COVID-19 vaccines at the baseline survey. Structural equation modeling has been applied to examine the direct and indirect effect of vaccine literacy on vaccine hesitancy. Time-to-event analysis was used to explore the effect of vaccine hesitancy on vaccination behavior.

RESULTS

Lower vaccine hesitancy was associated with higher vaccine literacy. The "3Cs" psychological antecedents were important mediators between vaccine literacy and vaccine hesitancy. The pathway between critical/interactive vaccine literacy and vaccine hesitancy through the "3Cs" psychological antecedents played a more important role. Time-to-event analysis showed participants with a higher vaccine hesitancy were prone to have a longer delay in vaccination.

CONCLUSIONS

Improving the public's ability to obtain and evaluate vaccination information can fix the public's psychological determinants of vaccination, reducing vaccine hesitancy and promoting vaccination. Governments need to put more effort into guiding and regulating the media to disseminate evidence-based information, rectifying misinformation, and improving the public's vaccine literacy through education, especially the public's capability to critically discern mixed information.