Vaccine hesitancy among parents of adolescents and its association with vaccine uptake

Effect of an Educational Intervention on Human Papillomavirus Vaccine Hesitancy in a Pediatric Clinic

STUDY OBJECTIVE

Despite numerous accredited health organizations recommending the HPV (human papillomavirus) vaccine in adolescence, an estimated 26% of parents across the US are hesitant to vaccinate their children against HPV. We aim to describe HPV vaccine hesitancy (VH) among parents of children using a previously validated VH scale (VHS) for the HPV vaccine and to reduce HPV VH among parents through direct HPV vaccine education.

METHODS

Our study sampled parents of patients aged 9-18 years who attended an outpatient pediatric clinic. Two groups (parents of unvaccinated and vaccinated patients against HPV) completed an identical VHS HPV before and after watching an educational video. Survey responses were collected using a 4-point Likert scale, score ranged from 9 to 45. Pre- to postintervention scores and vaccine uptake 12 months later were analyzed.

RESULTS

The VH score decreased for both the unvaccinated and vaccinated groups, while likelihood to vaccinate increased in the unvaccinated group. In addition, 48.1% of the adolescents in the unvaccinated group expressed their willingness to receive the HPV vaccination.

CONCLUSION

Overall, education on the HPV vaccine increased likelihood to vaccinate while also decreasing VH among parents. The results from our study could encourage additional clinical sites to adapt similar strategies to increase HPV vaccination.

Adverse events among early caregivers' COVID-19 vaccination correlated inversely with intention to vaccinate their children

OBJECTIVES

Vaccine hesitancy increased during the COVID-19 pandemic. We evaluated if manifestation of adverse events when caregivers received their vaccine was associated with their willingness to vaccinate their children.

METHODS

A multicenter, cross-sectional, multi-lingual survey of caregivers presenting to 19 pediatric Emergency Departments in the USA, Canada, Israel, and Switzerland early during the early stage of the pandemic, before vaccines for children were available. We asked caregivers if they were vaccinated against COVID-19, to report any side effects and if they would give vaccine to their child. We categorized all reported side effects and report the most common ones. We report willingness to vaccinate based on child's age.

RESULTS

Of 4261 caregivers, mean caregiver age was 38.3 years, 2893 (68.3 %) mothers, 3108 (73.3 %) greater than high school education. 43.6 % reported side effects, 35.7 % reported no side effects and 20.7 % were unvaccinated. The lowest rate of caregivers planning to vaccinate their children was the unvaccinated (6.9 %) and the highest was among caregivers who did not report any side effects (74.4 %). Caregivers with no reported side effects after vaccination were more likely to vaccinate their children compared to those that had some side effects (aOR of 1.34, 1.52 and 2.14 for ages <5, 5-11 and ≥12 years, respectively). Reporting general illness/feeling unwell, experiencing weakness, and breathing difficulty were associated with caregivers unlikely to plan to vaccinate their children. The OR to vaccinate children for each additional side effect was 0.86, 95 %CI = 0.78-0.95, p = 0.004, representing a decrease of 14 % in the odds of planning to vaccinate for each additional side effect.

CONCLUSIONS

Side effects experienced by caregivers are associated with their intention to vaccinate their children. Building of trust in vaccines, including communicating risks and benefits in the context of caregiver's experience, is important and may help enhance rate of vaccination of children.

A Qualitative Study of Social Processes, HPV Vaccine Attitudes, and Vaccination Behavior Among Hesitant Adopter Parents

Despite the availability of a highly effective human papillomavirus (HPV) vaccine, uptake remains below Healthy People 2030 targets, particularly in rural areas where HPV-related cancers are more prevalent. This study aimed to explore how social processes influence parents' HPV vaccination decisions, focusing on vaccine-hesitant parents who vaccinated their child(ren) against HPV despite their hesitancy, eg, "hesitant adopters." We conducted a qualitative exploratory analysis of in-depth interviews with hesitant adopter parents (n = 8) to explore how social interactions with trusted interlocutors influenced their decision-making. Hesitant adopter parents identified relevant professional expertise, direct experience with the HPV vaccine, and social proximity to interlocutors as influential factors. We argue that rather than a single moment or decision, vaccination decision-making is a dynamic, ongoing process affected by social processes. This study adds nuance to our understanding of how prior vaccination behavior functions in future vaccine acceptance.

Exploring reported causes of vaccine hesitancy among European adolescents and parents: results of a citizen science project

BACKGROUND

Progress in pediatric immunization is threatened by vaccine hesitancy. While recent estimates show 14-35% of European parents exhibit some degree of hesitancy, little is known about adolescents. We assessed vaccine hesitancy and associated factors in European adolescents and parents through the online Science4Pandemics platform.

METHODS

We conducted two cross-sectional surveys. One in individuals aged ≥ 12 and < 18 years, using a non-validated questionnaire adapted from the Parent Attitudes about Childhood Vaccines (PACV); and another using the PACV questionnaire in parents aged ≥ 18 years, who were not necessarily related to the adolescents.

RESULTS

1877 adolescents from Italy, Portugal, Poland and Spain were included. Of these, 45.9% were aged 12-14 years, and 54.1% were 15-17 years. The prevalence of hesitancy (adapted PACV score ≥ 50%) was 20.8% (390 individuals). Hesitancy prevalence varied between countries, from 12.5% in Spain to 31.6% in Poland (p < 0.001). Geographic region was the only associated factor for hesitancy [Odds Ratio (OR) for Polish adolescents: 3.20 (95%CI: 2.29, 4.51); OR for Italian adolescents: 2.28 (95%CI: 1.62, 3.24); OR for Portuguese adolescents: 1.13 (95%CI: 0.77, 1.66); all compared to Spanish adolescents]. Country remained the only associated factor in the multivariate logistic regression analysis. In contrast, 1135 parents of children under 18 were included, with hesitancy observed in 20.4% (232 individuals). The main associated factors for hesitancy, both in the univariate and multivariate analyses, were country of residence [OR for Italian parents: 2.34 (95%CI: 1.47, 3.80); OR for Polish parents: 2.69 (95%CI: 1.70, 4.36); OR for Portuguese parents: 2.26 (95%CI: 1.41, 3.68); all compared to Spanish parents], and age, with older parents being less hesitant (OR: 0.97, 95%CI: 0.96, 1.00). In both parents and adolescents, the main reasons for vaccine hesitancy were fear of vaccine side effects (56.1% in adolescents, 51.9% in parents) and lack of trust in government recommendations (21.9% in adolescents, 22.8% in parents).

CONCLUSIONS

Vaccine hesitancy in adolescents and parents in Europe is prevalent, with country of residence as a key influencing factor. Targeted strategies to educate both groups about immunization benefits and its side effects are essential, considering the heterogeneity across countries and reasons for hesitancy.

Determinants of Rotavirus Vaccine Acceptance in an Area of Southern Italy with Low Vaccination Coverage: A Case-Control Study by the Health Belief Model Questionnaire

BACKGROUND/OBJECTIVES

Rotavirus (RV) is the primary cause of gastroenteritis in children worldwide, contributing significantly to morbidity and mortality, particularly among children under five years of age. The introduction of Rotavirus vaccines (RVV) has markedly reduced RV-related childhood deaths, especially in Europe, where substantial reductions in hospitalizations and disease prevalence have been observed. Despite these advances, RVV uptake in Italy remains below the desired targets, with notable regional disparities. In Sicily, vaccination rates have fluctuated, with current coverage failing to meet national goals. Safety concerns and insufficient parental awareness are major barriers to RVV acceptance.

METHODS

This case-control study was conducted in Southern Italy to identify factors influencing parental acceptance of RVV. Data were collected from parents using a structured questionnaire that assessed socio-demographic factors, vaccine knowledge, and attitudes based on the Health Belief Model (HBM).

RESULTS

Overall, 226 parents were enrolled. Higher perceived benefit of RVV was significantly associated with increased vaccine adherence (Odds Ratio = 13.65; 95% Confidence Interval = 6.88-27.09; p < 0.001).

CONCLUSIONS

These results highlight the need for targeted interventions to improve vaccine coverage and address regional and socio-economic barriers to RVV acceptance. Furthermore, tailored educational campaigns and univocal information from healthcare providers could play pivotal roles in achieving higher vaccine uptake.

Exploring the Inherent Heterogeneity of Vaccine Hesitancy: A Study of a Childhood-Vaccine-Hesitant Population

Vaccine hesitancy and its determinants have been previously widely researched. Vaccine hesitancy has been defined as a continuum of attitudes, ranging from accepting vaccines with doubts to rejecting them. The present study aims to explore the heterogeneity of a childhood-vaccine-hesitant group by using a person-oriented approach-latent profile analysis. A non-representative cross-sectional sample of vaccine-hesitant Slovenians (N = 421, Mage = 35.21, 82.9% women) was used to identify differences based on their reliance on personal research ("self" researching instead of relying on science), overconfidence in knowledge, endorsement of conspiracy theories, complementary and alternative medicine, and trust in the healthcare system. The analysis revealed three profiles of vaccine-hesitant individuals. The most hesitant profile-vaccine rejecting-expressed the greatest reliance on personal research, expressed the highest endorsement of conspiracy theories and complementary and alternative medicine, showed moderate overconfidence in their knowledge, and expressed the highest levels of distrust in the healthcare system. We further found differences in sociodemographic structure and that the identified profiles differed in their attitudes regarding MMR, HPV, and Seasonal Influenza vaccinations. The present study demonstrates the heterogeneity of the vaccine-hesitant community and offers insights into some of the traits, which are crucial for designing pro-vaccine campaigns.

From Qualitative Research to Quantitative Preference Elicitation: An Example in Invasive Meningococcal Disease

BACKGROUND

Qualitative research is fundamental for designing discrete choice experiments (DCEs) but is often underreported in the preference literature. We developed a DCE to elicit preferences for vaccination against invasive meningococcal disease (IMD) among adolescents and young people (AYP) and parents and legal guardians (PLG) in the United States. This article reports the targeted literature review and qualitative interviews that informed the DCE design and demonstrates how to apply the recent reporting guidelines for qualitative developmental work in preference studies.

METHODS

This study included two parts: a targeted literature review and qualitative interviews. The Medline and Embase databases were searched for quantitative and qualitative studies on IMD and immunization. The results of the targeted literature review informed a qualitative interview guide. Sixty-minute, online, semi-structured interviews with AYP and PLG were used to identify themes related to willingness to be vaccinated against IMD. Participants were recruited through a third-party recruiter's database and commercial online panels. Interviews included vignettes about IMD and vaccinations and three thresholding exercises examining the effect of incidence rate, disability rate, and fatality rate on vaccination preferences. Participant responses related to the themes were counted.

RESULTS

The targeted literature review identified 31 concepts that were synthesized into six topics for the qualitative interviews. Twenty AYP aged 16-23 years and 20 PLG of adolescents aged 11-17 years were interviewed. Four themes related to willingness to be vaccinated emerged: attitudes towards vaccination, knowledge and information, perception of IMD, and vaccine attributes. Most participants were concerned about IMD (AYP 60%; PLG 85%) and had positive views of vaccination (AYP 80%; PLG 60%). Ninety percent of AYP and 75% of PLG always chose vaccination over no vaccination, independent of IMD incidence rate, disability rate, or fatality rate.

CONCLUSION

Willingness to be vaccinated against IMD was affected by vaccine attributes but largely insensitive to IMD incidence and severity. This article provides an example of how to apply the recent reporting guidelines for qualitative developmental work in preference studies, with 21 out of 22 items in the guidelines being considered.

Human Papillomavirus (HPV) Infection and Risk Behavior in Vaccinated and Non-Vaccinated Paraguayan Young Women

Cervical cancer is a global health concern and ranks fourth among the most prevalent cancers in women worldwide. Human papillomavirus (HPV) infection is a known precursor of cervical cancer and preventive measures include prophylactic vaccines. This study focused on sexually active Paraguayan women aged 18-25 years, exploring the intersection of HPV vaccination and sexual behavior. Among 254 participants, 40.9% received the Gardasil-4 vaccine, with no significant differences in sexual behavior between the vaccinated and unvaccinated sexually active groups. However, a notable decrease in the prevalence of HPV among the vaccinated women highlights the efficacy of this vaccine in reducing infections. The prevalence of any HPV type was 37.5% in vaccinated participants compared to 56.7% in unvaccinated participants (p = 0.0026). High-risk HPV types showed a significant difference, with a prevalence of 26.0% in vaccinated women compared with 52.7% in unvaccinated women (p < 0.001). Although a potential decline in genital warts was observed among the vaccinated individuals, statistical significance (p = 0.0564) was not reached. Despite the challenges in achieving high vaccination coverage, the observed reduction in HPV prevalence underscores the importance of ongoing monitoring, healthcare professional recommendations, and comprehensive risk management. These findings contribute to dispelling concerns about HPV vaccination influencing sexual behavior, advocating further large-scale research to explore the impact of vaccines on various HPV types and potential cross-protection.

Relationship between vaccine hesitancy and vaccination behaviors: Systematic review and meta-analysis of observational studies

BACKGROUND

Vaccination is crucial for prevention of infectious diseases, and identification of the impact of vaccine hesitancy on vaccination programs is crucial for early intervention and formulation of policies to alleviate vaccine hesitancy. The aim of this systematic review was to explore the relationship between vaccine hesitancy and negative vaccination behavior globally.

METHODS

We searched for observational studies in various databases. We conducted a meta-analysis using pooled odds ratios (OR) and 95 % confidence intervals (CI), performed meta regression and subgroup analysis to explore the role factors such as location and individual characteristics on the association between vaccine hesitancy and vaccination behavior.

RESULTS

A total of 46 articles were included in systematic analysis and 34 articles were included in the meta-analysis. The systematic analysis comprised 162,601 samples, whereas the meta-analysis included 147,554 samples. The meta-analysis showed that a higher rate of vaccine hesitancy was associated with an increased likelihood of adverse vaccination behaviors (all adverse behaviors: OR = 1.50, 95 % CI, 1.33-1.70, P < 0.001; unvaccinated: OR = 1.48, 95 % CI, 1.29-1.70, P < 0.001; vaccine delay: OR = 2.61, 95 % CI, 1.97-3.44, P < 0.001). The meta-regression results indicated that the heterogeneity observed was mainly from sample selection methods, age of vaccinees and the health status of participants. The results showed that parents of minor vaccinees or without high-risk health status had a higher association between vaccine hesitancy and vaccine uptake compared with populations exposed to higher health risks or adult vaccinees.

CONCLUSION

The findings provide evidence on the association between vaccine hesitancy and adverse vaccination behaviors. The results showed that these population-specific factors should be considered in future research, and during formulation of interventions and implementation of policies to improve vaccination uptake.

A Mixed-Methods Study on Topical Fluoride Beliefs and Refusal Behaviors for Caregivers of Children with Special Health Care Needs

OBJECTIVE

To understand topical fluoride-related beliefs and refusal behaviors for caregivers of children with special health care needs (CSHCN).

METHODS

This was an explanatory sequential mixed methods study. For the quantitative analyses, we surveyed 520 caregivers to (a) compare fluoride-related beliefs between caregivers of CSHCN and caregivers of healthy children and (b) evaluate the association between special health care need (SHCN) status and topical fluoride refusal. We used logistic regression models to generate unadjusted odds ratios, confounder-adjusted odds ratios (AOR), and 95% confidence intervals (CI). For the qualitative analyses, we interviewed 56 caregivers who refused or were hesitant about topical fluoride. Data were coded deductively and compared by SHCN status to an existing conceptual model of topical fluoride refusal.

RESULTS

In the quantitative analysis, 41.3% of caregivers refused or thought about refusing topical fluoride. There were no significant differences in fluoride beliefs by SHCN status (p-values > 0.05) nor was there a significant association between SHCN status and topical fluoride refusal (AOR: 0.65, 95% CI 0.37-1.14; p = 0.13). In the qualitative analysis, the relative importance of each domain of the conceptual model was similar between the caregiver groups. Two differences were that all caregivers of CSHCN thought fluoride was unnecessary and wanted to keep chemicals out of their child's body.

CONCLUSIONS FOR PRACTICE

While caregivers of CSHCN were not more likely to refuse topical fluoride than caregivers of healthy children, there may be important differences in the underlying reasons for refusing topical fluoride.

Psychological variables linked to hesitation toward vaccination against COVID-19 among late adolescents and young adults: The role of magical thinking and right-wing authoritarianism

INTRODUCTION

Several studies on the predisposition to be subjected to vaccination have shown that vaccine hesitation is a global phenomenon influenced by a lack of knowledge and awareness, as well as perceived risks and benefits. The purpose of this study was to investigate the mediating role of right-wing authoritarianism in the relationship between magical thinking and positive attitudes toward COVID-19 vaccines (i.e. trust of vaccine benefits, worries over unforeseen future effects, concerns about commercial profits, preference for natural immunity).

METHOD

The sample consisted of 201 Italian young adults, 49 males (24.4%), and 152 females (75.6%), aged between 18 and 25. Data were collected during 2022.

RESULTS

The results confirmed the role of right-wing authoritarianism as a mediator for magical thinking on positive vaccine attitudes. Findings indicated a positive association between right-wing authoritarianism and magical thinking and a negative relationship of both the aforementioned variables on positive vaccine attitudes. SEM analyses showed a direct positive association from magical thinking to right-wing authoritarianism and a direct negative association from right-wing authoritarianism to trust of vaccine benefits, to low worries over unforeseen future effects, to lack of concerns about commercial profits and to low preference for natural immunity.

CONCLUSIONS

The findings highlight that common contribution of odd or magical beliefs and right-wing authoritarianism may slow the spread of vaccines among late adolescents and young adults. Our findings provide insight on what effective communication with vaccine-resistant individuals should look like in order to increase the chances of reaching vaccine-hesitant individuals.

Willingness to receive Herpes Zoster vaccination among adults and older people: A cross sectional study in Italy

The objective of this study was to explore the Herpes Zoster (HZ) knowledge and the willingness to receive the HZ vaccination in adults and older people in Italy. The study was conducted on a sample of patients aged ≥65 years and over 50 years with chronic conditions who went to the clinics of general practitioners (GPs) in Campania region, Italy. Data was collected with a questionnaire administered through an interview. Multivariate logistic regression analysis was performed. 427 participants (83.2 %) had heard about HZ infection and correctly knew the main symptoms of the HZ disease, and 196 of them (45.9 %) were aware of the main complications of the infection, such as post-Herpetic Neuralgia (NPE) and Herpes Zoster ophthalmicus (HZO). Only 61 participants (11.8 %) had heard of the availability of a vaccination against HZ in Italy and 39 of them (63.9 %) knew that the vaccination is recommended in at-risk patients aged at least 50 years and for adults aged ≥65 years. 137 participants (26.6 %) had a positive attitude toward the willingness to receive the HZ vaccination. Participants aged 50-64 years, those who have more than one chronic disease, those who have received at least one recommended vaccination, those who had a positive attitude on the usefulness of HZ vaccination, and those who feel the need to receive additional information about HZ vaccination were more likely to have a positive attitude toward the willingness to receive the HZ vaccination. It is needed to implement effective strategies to improve HZ vaccination coverage in order to protect especially frail patients from the most serious complications of the disease.

Predictors for Uptake of Vaccines Offered during the Second Year of Life: Second Dose of Measles-Containing Vaccine and Meningococcal Serogroup A-Containing Vaccine, Ghana, 2020

BACKGROUND

Understanding the drivers of coverage for vaccines offered in the second year of life (2YL) is a critical focus area for Ghana's life course approach to vaccination. This study characterizes the predictors of vaccine receipt for 2YL vaccines-meningococcal serogroup A conjugate vaccine (MACV) and the second dose of measles-containing vaccine (MCV2)-in Ghana.

METHODS

1522 children aged 18-35 months were randomly sampled through household surveys in the Greater Accra Region (GAR), Northern Region (NR), and Volta Region (VR). The association between predictors and vaccination status was modeled using logistic regression with backwards elimination procedures. Predictors included child, caregiver, and household characteristics.

RESULTS

Coverage was high for infant vaccines (>85%) but lower for 2YL vaccines (ranging from 60.2% for MACV in GAR to 82.8% for MCV2 in VR). Predictors of vaccination status varied by region. Generally, older, first-born children, those living in rural settlements and those who received their recommended infant vaccines by their first birthday were the most likely to have received 2YL vaccines. Uptake was higher among those with older mothers and children whose caregivers were aware of the vaccination schedule.

CONCLUSIONS

Improving infant immunization uptake through increased community awareness and targeted strategies, such as parental reminders about vaccination visits, may improve 2YL vaccination coverage.

A Pilot Test of a Workshop for Pediatric Clinicians About Communicating with Parents About the HPV Vaccine Using the C-LEAR Approach

Low HPV vaccinations rates lead to missed opportunities to prevent cancer. Specifically, some parents (12-76%) report never receiving a recommendation for their child to receive the vaccine. Current models for talking about HPV vaccination fall short in that they focus primarily on how to introduce the vaccine with limited guidance on how to follow through with the conversation, particularly with those parents who may be hesitant. We developed the C-LEAR approach, an easy to remember, evidence-informed mnemonic to guide clinicians through the process of introducing and discussing the HPV vaccine with parents. We pilot tested this approach with a total of 20 pediatric clinicians (n = 13 residents; n = 7 attendings) in 60-min Zoom workshops that included a short didactic session, a demonstration of skills, and a small group, facilitator-led role play session. On an immediate post-training survey, all participants stated that the training was helpful and easy to understand. Ninety-four percent responded that they would implement what they had learned in their clinic. Participants reported appreciation for the small group sessions. While not specifically asked or required to incorporate the material into their practice, 1 year following the training, 8/9 (88%) participants reported using the C-LEAR approach in their clinics "most" or "all of the time." We are further testing this model through teaching our workshop in a large, randomized trial across the state of Florida.

Understanding barriers to vaccination against invasive meningococcal disease: a survey of the knowledge gap and potential solutions

INTRODUCTION

Invasive meningococcal disease (IMD) is a leading cause of life-threatening bacterial meningitis and septicemia. Evidence points to a knowledge gap among parents, teenagers, and healthcare providers (HCPs) regarding IMD and available vaccines, including those against the highly prevalent serogroup B.

AREAS COVERED

An online survey was conducted between March 27 and April 12, 2019, to gather insights into the knowledge that parents/guardians have about IMD vaccines. The children were aged 2 months-10 years in Australia, Brazil, Germany, Greece, Italy, and Spain, 5-20 years in the UK, and 16-23 years in the US. The findings were discussed in the context of the available literature and solutions were proposed to minimize the knowledge gap and the barriers to vaccination against IMD.

EXPERT OPINION

The survey demonstrated that parents have a good understanding of IMD but a limited understanding of the different serogroups and vaccines. The available literature highlighted multiple barriers to IMD vaccine uptake; these may be reduced through education of HCPs, clear recommendations to parents by HCPs, the use of technology, and disease-awareness initiatives that engage parents through physical and digital channels. Further studies are warranted to assess the impact of the COVID-19 pandemic on IMD vaccination.

Culture of vaccine acceptability or resistance: The curious case of Chile's COVID-19 vaccine rollout and anthropology's role in increasing vaccination uptake

Castillo and colleagues have described the curious case of Chile's COVID-19 vaccine rollout that how Chile has revealed a great success to vaccine a greater population. Interestingly, there are several factors responsible for that success and a lesson learnt for many countries who are lagging in this regard. Building on these authors arguments, I have defined the "culture of vaccine acceptability." In contrast, I explain the "culture of vaccine rejectability" based on own fieldwork in Pakistan. Chilean case has demonstrated how a culture is developed and influences vaccine uptake. For that, the countries lagging need to engage (medical) anthropologists as they are the culturologists.

"Why is it so necessary?": African American Parents' Perspectives on Delaying and Refusing HPV Vaccination

INTRODUCTION

This study aimed to describe the perspectives of parents who had delayed and refused human papillomavirus (HPV) vaccination for their children, even when it was discussed or recommended by a health care provider, and to identify the factors related to vaccine hesitancy.

METHOD

Twenty predominantly African American parents of children aged 11-17 years were recruited from various community clinics and organizations to participate in focus groups about their decision-making regarding HPV vaccination. Using deductive content analysis and the Vaccine Hesitancy Determinants Matrix, we describe their perspectives and influences on vaccination decision-making.

RESULTS

Multiple reasons emerged, which included concerns about the age of children, perceived discrimination and mistrust based on race and socioeconomic status, and vaccine safety.

DISCUSSION

Findings support the development of targeted interventions that address vaccine safety concerns, mistrust, patient-provider communication, and parent education about the benefits of HPV vaccination.

Willingness to receive a vaccine is influenced by adverse events following immunisation experienced by others

An adverse event following immunization (AEFI) can have consequences for an individual's future decision making and may contribute to vaccine hesitancy. AEFIs vary in severity and can be experienced directly (by an individual themselves) or indirectly (through witnessed or recounted events). We sought to measure the prevalence of specific AEFIs and understand which AEFIs have the greatest associations with reduced willingness to receive a vaccine and how injection anxiety may moderate the relationship. We conducted a cross-sectional online survey with both qualitative and quantitative elements in a sample of adults aged 18 years and over in Australia. Nineteen percent of the 1050 respondents reported experiencing an AEFI that they found stressful. Those who experienced an AEFI reported significantly higher levels of injection anxiety than those who did not. Within the group who reported experiencing an AEFI, respondents were significantly less likely to be willing to receive a COVID-19 vaccine if they reported: indirect exposure to an uncommon/rare AEFI compared with other AEFIs (aOR:0.39; 95% CI: 0.18-0.87); indirect exposure to a scientifically unsupported AEFI compared with other AEFIs (aOR:0.18; 95% CI: 0.05-0.57). Direct exposure to an AEFI was not associated with willingness to receive a COVID-19 vaccine. For those who reported experiencing an AEFI, the odds of willingness to receive a COVID-19 vaccine decreased significantly with an increase in injection anxiety (aOR:0.94; 95% CI: 0.9-0.98). Our results suggest that more is needed to mitigate the consequences of AEFIs on vaccine willingness. Empathically acknowledging at a community level, the experience of both real and perceived AEFIs and incorporating accounts of positive vaccination experiences in vaccine hesitancy interventions may be useful.

Uptake of the COVID-19 vaccine among healthcare workers in Malawi

BACKGROUND

Little is known about coronavirus disease 2019 (COVID-19) vaccination in Africa. We sought to understand Malawian healthcare workers' (HCWs') COVID-19 vaccination and its hypothesized determinants.

METHODS

In March 2021, as the COVID-19 vaccine roll-out commenced in Malawi, we surveyed clinical and lay cadre HCWs (n=400) about their uptake of the vaccine and potential correlates (informed by the WHO Behavioral and Social Drivers of COVID-19 Vaccination framework). We analyzed uptake and used adjusted multivariable logistic regression models to explore how 'what people think and feel' constructs were associated with HCWs' motivation to be vaccinated.

RESULTS

Of the surveyed HCWs, 82.5% had received the first COVID-19 vaccine dose. Motivation (eagerness to be vaccinated) was strongly associated with confidence in vaccine benefits (adjusted OR [aOR] 9.85, 95% CI 5.50 to 17.61) and with vaccine safety (aOR 4.60, 95% CI 2.92 to 7.23), but not with perceived COVID-19 infection risk (aOR 1.38, 95% CI 0.88 to 2.16). Of all the information sources about COVID-19 vaccination, 37.5% were reportedly negative in tone.

CONCLUSIONS

HCWs in Malawi have a high motivation to be vaccinated and a high COVID-19 vaccine uptake. Disseminating vaccine benefits and safety messages via social media and social networks may be persuasive for individuals who are unmotivated to be vaccinated and less likely to accept the COVID-19 vaccine.

Messaging preferences among Florida caregivers participating in focus groups who had not yet accepted the HPV vaccine for their 11- to 12-year-old child

BACKGROUND

In the United States, human papillomavirus (HPV) vaccination rates remain low. The President's Cancer Panel suggests that effective messaging about the HPV vaccination focus on the vaccine's safety, efficacy, ability to prevent cancer, and recommendation at ages 11- to 12-years. We aimed to develop messages about HPV vaccine that include the President Cancer Panel's suggestions and were acceptable to caregivers of adolescents.

METHODS

From August to October 2020, we conducted one-hour, Zoom videoconference focus groups with caregivers who lived in Florida, had an 11- to 12-year-old child, and had not had any of their children receive the HPV vaccine. Focus group moderators asked caregivers to react to three videos of clinician (i.e., MD, DO, APRN, PA) recommendations and three text message reminders. Thematic analysis was conducted using the constant comparative method and led by one author with qualitative analysis expertise. Two additional authors validated findings.

RESULTS

Caregivers (n = 25 in six groups) were primarily non-Hispanic white (84%) and educated (64% had at least an Associate's degree). Approximately a third of caregivers had delayed (44%) or decided against a vaccine for their child (36%). Caregivers described six preferred message approaches: recognize caregivers' autonomy, balanced benefits and risks, trustworthy sources, increased feasibility of appointment scheduling, information prior to decision point, and preferred personalized information. Caregivers expressed a desire to have the follow-up doses mentioned in the introduction.

CONCLUSIONS

HPV vaccine messages, whether delivered by a clinician or via text message, will be more acceptable to caregivers if they approach HPV vaccination as the caregivers' decision, and include information from trusted sources to help caregivers make an informed choice.

A systematic literature review to clarify the concept of vaccine hesitancy

Vaccine hesitancy (VH) is considered a top-10 global health threat. The concept of VH has been described and applied inconsistently. This systematic review aims to clarify VH by analysing how it is operationalized. We searched PubMed, Embase and PsycINFO databases on 14 January 2022. We selected 422 studies containing operationalizations of VH for inclusion. One limitation is that studies of lower quality were not excluded. Our qualitative analysis reveals that VH is conceptualized as involving (1) cognitions or affect, (2) behaviour and (3) decision making. A wide variety of methods have been used to measure VH. Our findings indicate the varied and confusing use of the term VH, leading to an impracticable concept. We propose that VH should be defined as a state of indecisiveness regarding a vaccination decision.

The Correlates & Public Health Consequences of Prospective Vaccine Hesitancy among Individuals Who Received COVID-19 Vaccine Boosters in the U.S

Supplemental “booster” vaccines may prove vital in combating variant waves of endemic COVID-19. Given relatively low levels of booster vaccine uptake, Americans’ willingness to receive a second booster shot is unclear. In a demographically representative survey of N = 3950 US adults (limited to a “boosted” subsample of N = 1551 who had not yet received a second booster), 49% [95% CI: 47, 51] of Americans report having received an initial booster shot, while just 34% [33, 36] report that they would be “very likely” to do so again. Concerns about missing work to vaccinate (−10%; B = 0.53, p = 0.05) and being unconvinced that additional boosters will be necessary (−47%; B = 2.24, p < 0.01) are significantly and negatively associated with being very likely to receive a second COVID-19 booster. These findings can help inform discussions about policies aimed at increasing vaccine uptake in the U.S., and broaden researchers’ understanding of vaccine reluctance among those who might otherwise hold positive views toward vaccination.

Perceived Vaccine Availability and the Uptake of Measles Vaccine in Sudan: The Mediating Role of Vaccination Hesitancy

This study aimed to evaluate whether measles vaccine uptake can be predicted directly or indirectly by parental perceptions about the availability of measles vaccine services with parental hesitancy towards the measles vaccine as a potential mediator. This was a community-based cross-sectional study conducted at Omdurman locality in Khartoum state, Sudan in February 2019. The study population included parents/guardians having at least one child aged 2-3 years old. Mediation analysis was conducted using two models, the ordinary least squares path analysis and multiple logistic regression. These models considered perceived vaccine accessibility and availability as independent factors, vaccine uptake as dependent factors, and vaccine hesitancy (PACV scores) as a mediator. A total of 495 responded and the mean age of the mothers who participated in the study was 31.1 (SD = 5.73). Half of the respondents (50.1%) completed university education and nearly three-quarters of the respondents (74.7%) were housewives. After controlling for the other factors, including the mother's age and the number of children, parental perception about the accessibility and availability of the measles vaccine influences the uptake of the measles vaccine indirectly through the mediation effect of measles vaccine hesitancy. We suggest that intervening in measles vaccine hesitancy in addition to measles vaccination access issues will have a positive impact on the uptake and coverage of the measles vaccine in Sudan.

Investigating how historical legacies of militarized violence can motivate COVID-19 vaccine hesitancy: Evidence from global dyadic survey

BACKGROUND

In almost all countries, COVID-19 vaccines available for public use are produced outside of that country. Consistent with recent social science research, we hypothesize that legacies of violent conflict from vaccine-producing against vaccine-consuming countries may motivate vaccine hesitancy among people in targeted countries that purchase vaccines produced by the erstwhile aggressor.

METHODS

Our analyses draw on data from the Correlates of War project and a large, representative survey of 18,291 adults that asked respondents in 16 countries to self-report their attitudes toward COVID-19 vaccines originating from 12 potential vaccine-producing countries in December 2020 (184 country-pairs, 208,422 ratings). For the main analysis, we used random-effect linear probability models and turned to Bayesian Model Averaging to probe the robustness of the main findings.

RESULTS

We demonstrate that elevated levels of historical violence between vaccine-producing and vaccine-consuming countries are associated with increased negative feelings toward a COVID-19 vaccine produced by the vaccine producer.

CONCLUSION

Global vaccine hesitancy may result, at least in part, from public perceptions of historical conflict between vaccine-producing and vaccine-consuming countries. These results can help public health practitioners better preempt and adjust for cross-national vaccine resistance.

Vaccine hesitancy and HPV vaccine uptake among male and female youth in Switzerland: a cross-sectional study

OBJECTIVES

Identifying factors associated with human papillomavirus (HPV) vaccine uptake is essential for designing successful vaccination programmes. We aimed to examine the association between vaccine hesitancy (VH) and HPV vaccine uptake among male and female youth in Switzerland.

DESIGN

With a cross-sectional study, an interview-based questionnaire was used to collect information on sociodemographic factors, vaccination records and to measure the prevalence of VH using the Youth Attitudes about Vaccines scale (YAV-5), a modified version of the Parent Attitudes about Childhood Vaccinations survey instrument.

SETTING AND PARTICIPANTS

Eligible male and female participants, 15-26 years of age, were recruited through physicians' offices and military enlistment in all three language regions of Switzerland. Of 1001 participants, we included 674 participants with a vaccination record available (415 males and 259 females) in this study.

PRIMARY AND SECONDARY OUTCOME MEASURES

The outcome was uptake for HPV vaccine (having received ≥1 dose of HPV vaccine). Covariates were VH, sex, age and other sociodemographics.

RESULTS

151 (58%) female and 64 (15%) male participants received ≥1 dose of HPV vaccine. 81 (31%) female and 92 (22%) male participants were VH (YAV-5-Score >50). The odds for being unvaccinated were higher for VH women than non-VH women, adjusted OR=4.90 (95% CI 2.53 to 9.50), but similar among VH and non-VH men, OR=1.90 (95% CI 0.84 to 4.31). The odds for being unvaccinated were lower for younger men (born on or after 1 July 2002) than older men (born before 1 July 2002), OR=0.34 (95% CI 0.14 to 0.81), but we found no association between age and vaccine uptake for female youth, OR=0.97 (95% CI 0.48 to 1.97).

CONCLUSIONS

VH was associated with lower HPV vaccine uptake in female youth but not male youth in our study population in Switzerland. Our findings suggest that issues other than VH contribute to HPV underimmunisation in male youth in Switzerland.

COVID-19 prevention behaviors, trust, and intent to vaccinate among youth at risk for HIV

The current study examines COVID-19 prevention behaviors and vaccine intentions among 83 youth at high risk for HIV. Most youth self-identified as Latinx (52%), cisgender men (84%), and homosexual (66%). Youth self-reported COVID-19 prevention behaviors and intentions to vaccinate. Participants reported wearing face masks, washing hands, and staying six feet apart, but fewer reported leaving home only for essential needs. About one-third reported that they would not get a vaccine, and lack of trust in their doctors and the government were significantly associated with non-intention. To improve efforts towards herd immunity, interventions to improve health messaging from trusted sources for at-risk youth may be necessary to achieve higher vaccine uptake.

Attitudes and perceptions of mothers towards childhood vaccination in Greece: lessons to improve the childhood COVID-19 vaccination acceptance

BACKGROUND

Maternal attitudes and beliefs have been shown to influence childhood vaccination coverage, resulting in under-vaccination, non-vaccination, and vaccination delay. This study aimed to investigate the mothers' attitudes and perceptions about vaccination for their children in Greece.

METHODS

This was an online cross-sectional study, conducted from 4 April to 8 June 2020. A self-administered questionnaire was used to collect information about mothers' and their children's socio-demographic characteristics, previous vaccination behavior, and mothers' attitudes and perceptions about childhood vaccination. Participants included adult mothers with at least one minor child.

RESULTS

One thousand eight hundred eighty-five mothers participated, with the majority (91.7%) believing in the usefulness of vaccines and that vaccines protect children from serious and life-threatening diseases. A larger percentage of mothers with higher educational attainment agreed/absolutely agreed that all vaccinations provided by the National Vaccination Program must be offered to their children (91.6%) (p = 0.02) and that vaccines protect children from serious and life-threatening diseases (92.9%) (p = 0.01). Significant more married/in cohabitation and not single-parent mothers agreed that vaccines are safe (53.5% and 53.4%, respectively). There were also several significant associations between maternal attitudes toward childhood vaccination and previous maternal vaccination practices [(e.g., adherence to recommended vaccination dosages (all p-values < 0.01), vaccination delays (all p-values < 0.05), and vaccination during pregnancy (all p-values < 0.01)].

CONCLUSION

Maternal attitudes and perceptions toward childhood vaccination are significantly influenced by sociodemographic factors and maternal vaccination practices. Revealing those is essential for public health officials in developing future strategies to improve childhood vaccination coverage and acceptance of new vaccines such as the COVID-19 vaccine.

Factors Influencing COVID-19 Vaccination Intentions Among College Students: A Cross-Sectional Study in India

Background: Students act as messengers in delivering effective messages for better uptake of health-promoting behavior. Understanding their knowledge about coronavirus disease 2019 (COVID-19), intentions to use the COVID-19 vaccine, and its associated factors will help develop promising strategies in vaccine promotion concerning the current COVID-19 pandemic. Methods: A cross-sectional online survey was carried out among students in the healthcare and non-healthcare sectors to assess their intentions to get vaccinated against the COVID-19. A non-probability snowball sampling technique was used to recruit study participants (N = 655) through social media platforms and emails. Study participants were recruited across the country, including six major geographical regions (Eastern, Western, Northern, Southern, North-east, and Central) in India between November 2020 and January 2021 before the introduction of the COVID-19 vaccine. Descriptive statistics were used to present the sociodemographic, and vaccine-related behaviors of the study participants. Key determinants that likely predict vaccine acceptance among students were modeled using logistic regression analysis. For each analysis, p < 0.05 was considered significant. Results: A total of 655 students were recruited, 323 from healthcare and 332 from non-healthcare sectors, to assess their intentions to receive the COVID-19 vaccine. Of the 655 students, 63.8% expressed intentions to receive the COVID-19 vaccine. The acceptance was higher among non-healthcare students (54.07 vs. 45.93%). At the time of the study, 27.8% of the students indicated that they had been exposed to a confirmed COVID-19 patient. A vast majority (93.4%) of the students knew about the COVID-19 virus, and most (89.3%) of them were aware of the development of a COVID-19 vaccine. The history of vaccine hesitancy was found to be low (17.1%). Only one-third (33.4%) of the students showed concern about contracting COVID-19. Trust in the healthcare system [adjusted odds ratio (aOR): 4.13; (95% CI: 2.83-6.04), p < 0.00] and trust in domestic vaccines [aOR: 1.46; (95% CI: 1.02-2.08), p < 0.05] emerged as the significant predictors of student's intention to get vaccinated. Higher acceptance for vaccine was observed among students in the non-healthcare [aOR: 1.982; 95% CI: 1.334-2.946, p < 0.00]. Conclusion: This study shows that the Indian college students had relatively high levels of positive intentions to receive COVID-19 vaccines, although about one-third were not sure or unwilling to receive the vaccine, highlighting possible vaccine hesitancy. Informational campaigns and other strategies to address vaccine hesitancy are needed to promote uptake of COVID-19 vaccines.

Provider perspectives on communication and dismissal policies with HPV vaccine hesitant parents

Parental vaccine hesitancy is a growing concern. Less is known about provider or practice characteristics that encounter HPV-specific vaccine-hesitant parents, the providers' confidence in responding to HPV vaccine concerns, and the attitudes and use of vaccine dismissal policies (i.e., removing patients from the practice). North Texas providers completed an online survey. Dependent variables assessed: (1) percentage of HPV vaccine-hesitant parents encountered in practice defined as substantive, or high (≥11%, or among more than one out of ten adolescent patient encounters) versus low (≤10%) levels; (2) confidence in responding to 11 HPV vaccine concerns; (3) attitudes and use of vaccine dismissal policies. Chi-square and Fisher's exact tests were conducted. Among 156 providers, 29% reported high HPV vaccine hesitancy (≥11% of patient population). Overall, providers reported being "very confident" in addressing vaccine concerns (mean: 3.37 out of 4, SD: 0.57). Mean confidence scores were significantly higher for white (vs. non-white) providers and for pediatricians (vs. family practitioners). Providers were least confident in responding to parents' religious/personal beliefs (69%). Some providers (25%) agreed with policies that dismissed vaccine-hesitant parents after repeated counseling attempts. More providers used dismissal policies for childhood (19%) than adolescent (10%) immunizations. Provider communication training should include parental religious/personal beliefs to effectively address HPV vaccine hesitancy. Other regions should examine their HPV-specific vaccine hesitancy levels to understand how the use of dismissal policies might vary between adolescent and childhood immunizations.

HPV immunization among young adults (HIYA!) in family practice: A quality improvement project

AIMS

Thousands of anogenital and oropharyngeal cancers every year might be prevented through increased receipt of vaccination against the human papillomavirus (HPV). This project aimed to (1) increase the rate of HPV vaccination status assessment, and (2) improve HPV vaccine initiation and completion rates among 18 to 26-year-old patients in the family practice setting.

DESIGN

Quality improvement project, pre/post intervention design.

METHODS

This project implemented the HIYA! (HPV Immunization among Young Adults) Intervention in a private sports and family practice in central New Jersey. HIYA! implemented 10 pre-, during, and post-visit outcome measures during every family medicine visit with an 18 to 26-year-old patient for HPV. Data collection involved retrospective chart review of every eligible patient during the 12-week implementation period from 17 August to 06 November 2020 and during the same 12-week control period in 2019.

RESULTS/FINDINGS

One hundred sixteen charts from 2019 and 129 charts from 2020 were reviewed for assessment of HPV vaccination status and HPV vaccine initiation and/or completion. Multivariable logistic regression analysis demonstrated that participants in the control group were 84% less likely to be assessed for HPV vaccination status and were 91% less likely to initiate and complete HPV vaccination compared with the intervention group.

CONCLUSION

This QI project found HIYA! to be an effective and feasible strategy to improve HPV vaccination rates among 18 to 26-year-old patients in a family practice setting.

IMPACT

The human papillomavirus (HPV) is the most common sexually transmitted disease in the United States, and causes thousands of cancers annually. Although vaccination against HPV can prevent these cancers, vaccination rates remain low, particularly among young adults ages 18 to 26 years. The positive impact of HIYA! was evident based on its success despite the unique challenges presented during the implementation period due to the COVID-19 pandemic.

The Youth Attitudes about Vaccines (YAV-5) scale: adapting the parent attitudes about childhood vaccines short scale for use with youth in German, French, and Italian in Switzerland, exploratory factor analysis and mokken scaling analysis

No validated measures of vaccine hesitancy (VH) for youth vaccination currently exist. We adapted the Parent Attitudes about Childhood Vaccines survey (PACV-15) for use in youth to create the version Youth Attitudes about Vaccines survey (YAV-14 and YAV-5), then translated it into three languages (German, French, and Italian). We administered the YAV-14 to 1,003 youth aged 15-26 years in Switzerland. We used exploratory factor analysis and Mokken scale analysis to explore the psychometric properties, Cronbach's alpha to investigate the reliability for the YAV-14 and the YAV-5, but we only report results of the YAV-5 analysis here. We determined construct validity by logistic regression of the association between youth VH as measured by the YAV-5 and non-receipt of the first human papillomavirus (HPV) vaccine dose. EFA produced a single scale in German and French while two factors were obtained in Italian. All language versions fit the Mokken scale models with medium-scale strength. There was a significant association between VH and HPV vaccine non-receipt for the full sample (odds ratio (OR); 1.93, 95% confidence interval (CI); 1.31-2.85). Language-stratified analyses found a significant association between VH and non-immunization in the German-language sample. Our results demonstrate that the German version of YAV-5 is a valid and reliable scale for identifying vaccine hesitant youth regardless of sex, and the French version is a valid and reliable scale for identifying vaccine hesitant female youth. Further validation is needed for Italian and French-speaking male youth.

Investigation of knowledge, attitude and behaviours of parents refusing childhood vaccines in Malatya, an eastern city of Turkey

OBJECTIVES

The modern rise of vaccine rejection in society can alter the current progress that has been made towards the control and prevention of certain diseases, possibly even resulting in epidemics involving these preventable diseases. The aim of this study is to analyse the knowledge, attitude and behaviours of parents in Malatya city who rejected childhood vaccines.

METHODS

This descriptive, cross-sectional study was conducted between September-November 2019. The study includes parents who rejected vaccines and are registered in the family medicine clinics of Malatya city - total of 453 participants. The objective was to include all parents and avoid a sampling procedure. However, only 151 (33%) parents agreed to participate. These parents who rejected vaccines were individually contacted by phone. Descriptive data was represented by number (n) and percentage (%). The chi-square test was utilized in the statistical analysis of data and p < 0.05 was considered significant in all evaluations.

RESULTS

Mothers in the study group had a mean age of 26.07 ± 3.64, while the fathers were on average 30.03 ± 4.59 years of age; 98% of parents were aware of the health risks that vaccine rejection presented; 93% of parents were not satisfied with the explanation, insight, and advice that the healthcare personnel provided regarding vaccines. All parents of the study group stated the following: vaccines should not be administered because other children in their close environment acquired a disease as a result of vaccination, vaccines can harm the immune system of children - not yet fully developed, vaccines are unsafe and endanger the health of children.

CONCLUSIONS

It can be said that parents who have obtained a lot of false information possess altered decisions and views on vaccinations, to the point where they accept the risks presented by preventable diseases. In addition, individuals lose trust following negative experiences with vaccination.

Vaccine hesitancy: evidence from an adverse events following immunization database, and the role of cognitive biases

BACKGROUND

Vaccine hesitancy has been a growing challenge for public health in recent decades. Among factors contributing to vaccine hesitancy, concerns regarding vaccine safety and Adverse Events (AEs) play the leading role. Moreover, cognitive biases are critical in connecting such concerns to vaccine hesitancy behaviors, but their role has not been comprehensively studied. In this study, our first objective is to address concerns regarding vaccine AEs to increase vaccine acceptance. Our second objective is to identify the potential cognitive biases connecting vaccine hesitancy concerns to vaccine-hesitant behaviors and identify the mechanism they get triggered in the vaccine decision-making process.

METHODS

First, to mitigate concerns regarding AEs, we quantitatively analyzed the U.S. Vaccine Adverse Event Reporting System (VAERS) from 2011 to 2018 and provided evidence regarding the non-severity of the AEs that can be used as a communicable summary to increase vaccine acceptance. Second, we focused on the vaccination decision-making process. We reviewed cognitive biases and vaccine hesitancy literature to identify the most potential cognitive biases that affect vaccine hesitancy and categorized them adopting the Precaution Adoption Process Model (PAPM).

RESULTS

Our results show that the top frequent AEs are expected mild reactions like injection site erythema (4.29%), pyrexia (3.66%), and injection site swelling (3.21%). 94.5% of the reports are not serious and the average population-based serious reporting rate over the 8 years was 25.3 reports per 1 million population. We also identified 15 potential cognitive biases that might affect people's vaccination decision-making and nudge them toward vaccine hesitancy. We categorized these biases based on the factors that trigger them and discussed how they contribute to vaccine hesitancy.

CONCLUSIONS

This paper provided an evidence-based communicable summary of VAERS. As the most trusted sources of vaccine information, health practitioners can use this summary to provide evidence-based vaccine information to vaccine decision-makers (patients/parents) and mitigate concerns over vaccine safety and AEs. In addition, we identified 15 potential cognitive biases that might affect the vaccination decision-making process and nudge people toward vaccine hesitancy. Any plan, intervention, and message to increase vaccination uptake should be modified to decrease the effect of these potential cognitive biases.

Vaccine hesitancy and reported non-vaccination in an Irish pediatric outpatient population

Vaccine hesitancy is defined as a delay in acceptance, or refusal, of vaccines, despite availability. It is a complex and context specific phenomenon and identified as a global health priority. The "Parent Attitudes about Childhood Vaccines" (PACV) questionnaire is a validated tool for identifying vaccine hesitancy. Our aim was to use the PACV to assess vaccine hesitancy and its relationship with reported non-vaccination in an Irish population, for the first time. Our participants were parents or caregivers of children attending general pediatric clinics in a tertiary pediatric hospital in Dublin, Ireland, between September and December 2018. In total, 436 participants completed the questionnaire. 5.5% of our population reported non-vaccination. Human papilloma virus and measles, mumps, rubella vaccines were the most commonly cited vaccines of concern (11.5% and 6.7%, respectively), and autism spectrum disorder was the most commonly side effect of concern (4.3%). Mean PACV score was 26.9 (SD 19.1), with a significant difference between non-vaccinators and vaccinators (53.2 vs 25.3, p<0.001). Safety and efficacy concerns were the major contributor to non-vaccination. 14.4% of our population were vaccine-hesitant using the conventional cut-off score, which increased to 22% when using an optimal cut-off which maximized sensitivity and specificity. The accuracy of the PACV score to identify non-vaccination was good (area under the ROC curve = 0.827), and the optimal cut-off had a high negative predictive value (98.5%).Conclusion: PACV identified reported non-vaccination with high accuracy in our population. It may be useful to screen vaccine-hesitant parents who could benefit from interventions to improve uptake. What is Known: • Vaccine hesitancy is a leading threat to global health, with falls in vaccine uptake associated with disease outbreaks worldwide. • The Parent Attitudes about Childhood Vaccines (PACV) questionnaire is a validated measure of vaccine hesitancy and correlates with non-vaccination in many populations. What is New: • This large study in a pediatric outpatient clinic setting represents the first use of the PACV in a Western European population to assess vaccination hesitancy. • The PACV may be an effective way of screening a pediatric clinic population to identify vaccine-hesitant parents or caregivers for targeted vaccine promotion.

Perceptions and Knowledge About the MenB Vaccine Among Parents of High School Students

Serogroup B meningococcal disease (MenB) causes almost 60% of meningitis cases among adolescents and young adults. Yet, MenB vaccine coverage among adolescents remains below 10%. Since parents are the primary medical decision makers for adolescents, we examined MenB vaccination rates and parent attitudes about meningitis and the MenB vaccine. In 2018, in conjunction with a county-wide, school-based immunization campaign, we conducted a mixed methods study among parents of 16- to 17-year-olds. We facilitated focus groups asking parents about their knowledge of meningitis and reactions to educational materials and sent behavioral surveys based on Health Belief Model constructs to parents through the county high school system. Parents in three focus groups (n = 8; participation rate = 13%) expressed confusion about their child's need to receive the MenB vaccine in addition to the meningococcal conjugate vaccine (MenACWY), but conveyed strong trust in their physicians' recommendation. Among survey participants (n = 170), 70 (41%) had heard of the MenB vaccine. Among those 70 parents, the most common barriers to vaccination were concerns about side effects (55%) and uncertainty of susceptibility due to receipt of the MenACWY vaccine (30%). The percentage of teens that received at least one dose of the MenB vaccine was 50% (n = 35) by parent report and 23% (n = 16) by state vaccination records. Parents demonstrated uncertainty and confusion about the MenB vaccine particularly due to the existence of another meningitis vaccine and limited health care provider recommendations. Confirmatory studies of parent confusion about the MenB vaccine are needed to develop interventions.

A critical review of measures of childhood vaccine confidence

The World Health Organization and global partners sought to identify existing measures of confidence in childhood vaccines, as part of a broader effort to measure the range of behavioural and social drivers of vaccination. We identified 14 confidence measures applicable to childhood vaccination in general, all published between 2010 and 2019. The measures examined 1-5 constructs and included a mean of 12 items. Validation studies commonly examined factor structure, internal consistency reliability, and criterion-related validity. Fewer studies examined convergent and discriminant validity, test-retest reliability, or used cognitive interviewing. Most measures were developed and validated only in high-income countries. These findings highlight the need for a childhood vaccine confidence measure validated for use in diverse global contexts.

Association of vaccine hesitancy and immunization coverage rates in the European Union

While previous studies have validated vaccine hesitancy scales with uptake behavior at the individual level, the conditions under which aggregated survey data are useful are less clear. We show that vaccine public opinion data aggregated at the subnational level can serve as a valid indicator of aggregate vaccine behaviour. We use a public opinion survey (Eurobarometer EB 91.2) with data on vaccine hesitancy for the EU in 2019. We link this information to (subnational) regional immunization coverage rates for childhood vaccines - DTP3, MCV1, and MCV2 -- obtained from the WHO for 2019. We conduct multilevel regression analyses with data for 177 regions in 20 countries. Given the variation in vaccine hesitancy and immunization rates between countries and within countries, we affirm the valuable role that surveys can play as a public health surveillance tool when it comes to vaccine behavior. We find statistically significantly lower regional vaccine immunization rates in regions where vaccine hesitancy is more pronounced. Our results suggest that different uptake rates across subnational regions are due, at least in part, to differences in attitudes towards vaccines and vaccination. The results are robust to several alternative specifications.

The impact of provider recommendation on human papillomavirus vaccine and other adolescent vaccines

This study explored the association between provider recommendation and adolescent vaccine coverage. We analyzed data from the 2008 to 2018 National Immunization Survey-Teen including coverage with one dose of quadrivalent meningococcal conjugate vaccine (MenACWY), Tetanus-diphtheria-acellular pertussis vaccine (Tdap), and one and three doses of Human papillomavirus (HPV) vaccine. We compared vaccine coverage between those who recalled a provider recommendation and those who did not. Among those who received a provider recommendation for MenACWY, coverage trended from 67.8% (2008) to 88.1% (2013), contrasted to those who did not, trending from 30.9% to 73.1%. Among those with a provider recommendation for Tdap, coverage trended from 47.6% to 89.7%, contrasted to those who did not, trending from 35.6% to 82.2%. Among females with a provider recommendation for HPV vaccine, receipt of initial dose of HPV vaccine trended from 57.5% (2008) to 74.3% (2018), contrasted to those who did not, trending from 18.1% to 49.8%, and among males, trended from 17.2% (2010) to 75.1% (2018) for those with a provider recommendation, compared to 0.5% to 44.7% for those without. In 2013, coverage difference by provider recommendation was 26.0% among females for one dose of HPV vaccine and 21.9% for three doses, and among males was 44.8% and 20.8%, respectively, while it was lower at 15% for MenACWY and 7.6% for Tdap. For each vaccine, coverage was higher with a provider recommendation; the largest difference was noted for HPV vaccine. This finding verifies for providers the importance of their recommendation, especially for the HPV vaccine.

A validated modification of the vaccine hesitancy scale for childhood, influenza and HPV vaccines

INTRODUCTION

Vaccine hesitancy contributes to outbreaks of preventable disease worldwide. The Vaccine Hesitancy Scale (VHS), developed by the international WHO SAGE Working Group, has been validated previously for measuring hesitancy towards childhood vaccines; some psychometric properties were suboptimal.

METHODS

We collected data using large, nationally-representative samples of parents in the U.S. We adapted the VHS items, and additional hesitancy items, to assess hesitancy towards influenza and HPV vaccines in addition to routine childhood vaccines. We then used exploratory and confirmatory factor analysis to identify latent constructs and create modified scales for childhood (VHS-child), influenza (VHS-flu) and HPV (VHS-HPV) vaccines with improved psychometric properties. Finally, we compared hesitancy scores on the VHS-child, VHS-flu, and VHS-HPV, to self-reported receipt of each vaccine category, and compared subscale scores to assess whether drivers of hesitancy differed by vaccine category.

RESULTS

2052 parents of children <18 years old completed the VHS-child and VHS-flu while 2020 parents of adolescents completed the VHS-HPV. A two-factor structure of 'risks' and a 'lack of confidence' was found for each vaccine category. Slight modifications to the VHS improved psychometric properties. Hesitancy was strongly associated with vaccine receipt: e.g., 76% of parents not hesitant towards influenza vaccine had vaccinated their child the past season, versus 9% of hesitant parents (p < 0.0001). Subscale scores also differed significantly between vaccines: lack of confidence was greater towards influenza (Median (IQR): 2.0 (1.2, 3.3)) and HPV (2.0 (1.3, 3.0)) vaccines than childhood (1.2 (1.0, 1.8), p < 0.0001 for both) vaccines; perceived risks of HPV vaccines (2.7 (1.7, 3.7)) were greater than for childhood vaccines (2.0 (1.3, 3.0), p < 0.0001).

CONCLUSIONS

Our modified VHS scales perform well psychometrically and allow for consistent measurement of the extent and reasons for hesitancy between vaccine categories. We suggest that future work use these scales to examine hesitancy towards other vaccines and to monitor hesitancy over time.

HPV vaccination prevalence, parental barriers and motivators to vaccinating children in Hawai'i

Objective: To determine the prevalence and barriers to human papillomavirus (HPV) vaccine uptake among 11-18 year olds in the Hawai'i's four major ethnic groups-Native Hawaiians, Filipinos, Japanese, and Caucasians. Study design: A telephone survey assessed parents' knowledge of HPV and the HPV vaccine, status of their child's HPV vaccine uptake, variables operationalizing the Health Belief Model, and barriers and motivators to uptake. Results: Across the groups, 799 parents completed the survey. About 35% of daughters and 19% of sons had received all three shots. Although ethnic differences in vaccine uptake were seen in bivariate analysis (with significantly lower uptake in Filipino youth), in multivariable logistic regression analysis, only Caucasian parents were significantly less likely to start their sons on the HPV vaccine series compared with Japanese parents (reference group). Having heard about the vaccine, believing in its effectiveness, and older age of the child were also associated with vaccine uptake. Motivators for HPV vaccination were physician's recommendation and wanting to protect one's child. The primary barrier to uptake was lack of knowledge about the vaccine. Conclusions: Findings reinforce the fact that a physician's recommendation and receipt of information about the vaccine are strong motivators for parents to vaccinate their children, regardless of ethnicity.

Resources for assessing parents' vaccine hesitancy: a systematic review of the literature

The concept of Vaccine Hesitancy has begun to appear in the scientific landscape, referring to the reluctance of a growing proportion of people to accept the vaccination offer. A variety of factors were identified as being associated with vaccine hesitancy but there was no universal algorithm and currently there aren't any established metrics to assess either the presence or impact of vaccine hesitancy. The aim of this study was to systematically review the published questionnaires evaluating parental vaccine hesitancy, to highlight the differences among these surveys and offer a general overview on this matter. This study offers a deeper perspective on the available questionnaires, helping future researches to identify the most suitable one according to their own aim and study setting.

Association of cognitive biases with human papillomavirus vaccine hesitancy: a cross-sectional study

Given the link between vaccine hesitancy and vaccine-preventable disease outbreaks, it is critical to examine the cognitive processes that contribute to the development of vaccine hesitancy, especially among parents of adolescents. We conducted a secondary analysis of baseline data from a two-phase randomized trial on human papillomavirus to investigate how vaccine hesitancy and intent to vaccinate are associated with six decision-making factors: base rate neglect, conjunction fallacy, sunk cost bias, present bias, risk aversion, and information avoidance. We recruited 1,413 adults residing in the United States with at least one daughter aged 9-17 years old through an online survey on Amazon Mechanical Turk. Vaccine hesitancy, intent to vaccinate, and susceptibility to cognitive biases was measured through a series of brief questionnaires. 1,400 participants were in the final analyzed sample. Most participants were white (74.1%), female (71.6%), married (75.3%), and had a college or graduate/professional education (88.8%). Conjunction fallacy, sunk cost bias, information avoidance, and present bias may be associated with vaccine hesitancy. Intent to vaccinate may be associated with information avoidance. These results suggest that cognitive biases play a role in developing parental vaccine hesitancy and vaccine-related behavior.

HPV vaccine hesitancy among parents in Italy: a cross-sectional study

This cross-sectional survey determined the vaccine hesitancy related to Human papillomavirus (HPV) and the determinants among parents of adolescents aged 12 and 13 years in Italy. Data was collected through a self-administered questionnaire. Two-thirds of the parents (66.7%) had heard of HPV infection and knew that the vaccination was a preventive measure. Parents who had vaccinated their child against the HPV were more likely to have this knowledge. The vast majority (88%) considered the immunization useful for the prevention of HPV-related cancers with an average value of 8.4. This positive attitude was higher among parents who had heard of HPV infection and knew that vaccination was a preventive measure, who had received information from physicians, who had vaccinated their child against the HPV, who were concerned that their child could contract the HPV infection, and who needed information on HPV vaccination. More than half (57.9%) self-reported that they had vaccinated their child against HPV and only 6.2% had delayed the administration of a dose. One-third (33.3%) were hesitant toward anti-HPV vaccination with a total Parent Attitudes about Childhood Vaccines Survey (PACV) score ≥50. Unmarried respondents, those who had not heard of HPV infection and did not know that the vaccination was a preventive measure, who did not believe that the vaccination was useful for the prevention of HPV-related cancers, and who needed information on HPV vaccination were more likely to be hesitant. Communication and education strategies must be undertaken to ensure that parents are fully informed and health-care professionals should provide materials with details regarding the risk of acquiring a HPV infection and vaccine usefulness.

Vaccine hesitancy in the French population in 2016, and its association with vaccine uptake and perceived vaccine risk-benefit balance

Vaccine hesitancy (VH) is prominent in France. Objectives: This study aimed to estimate the prevalence and socio-demographic correlates of VH in sub-groups of the French population and to investigate the association of VH with both vaccine uptake and perceived risk–benefit balance (RBB) for four vaccines. Methods: During the 2016 Health Barometer – a national cross-sectional telephone survey in a representative sample of the French population – parents of 1–15 year-old children, parents of 11–15 year-old girls and elderly people aged 65–75 years were asked about VH (using three questions adapted from the World Health Organization definition), vaccine uptake and perceived RBB for measles and hepatitis B (children’s parents), human papillomavirus (girls’ parents) and seasonal influenza (elderly people) vaccines. Results: A total of 3,938 parents including 959 girls' parents – and 2,418 elderly people were interviewed. VH prevalence estimates were 46% (95% confidence interval (CI): 44–48) among parents, 48% (95%CI: 45–51) among girls’ parents and 35% (95% CI: 33–36) among elderly people, with higher estimates associated with high education level, children’s age (10–15 years), and, for the elderly, poor perception of health status. VH was associated with uncertainty about and/or an unfavourable perception of vaccines’ RBB for the four vaccines and with lower self-reported vaccine uptake, except for human papillomavirus vaccine in girls. Results were confirmed by multivariable analysis. Conclusion: Further research is needed to study the association between VH and vaccine uptake for other vaccines, and to design and validate measurement tools to monitor VH over time.

Use of a choice survey to identify adult, adolescent and parent preferences for vaccination in the United States

Background

Adult and adolescent vaccination rates are far below coverage targets in the United States. Our objective was to identify the most influential factors related to vaccine uptake among adults, adolescents, and parents of adolescents (parents) in the United States.

Methods

We used a fractional factorial design to create a binary choice survey to evaluate preferences for vaccination. The national survey was fielded to a sample of adults, adolescents ages 13–17 years, and parents, using a national probability-based online research panel in November 2015. Respondents were presented with 5 profiles of a hypothetical vaccine and asked in a series of questions whether they would accept each vaccine. We analyzed the binary choice data using logistic regression in STATA v13 (College Station, TX) to calculate the odds that a participant would choose to accept the vaccine.

Results

We received completed responses from 334 (51%) of 652 adults, 316 (21%) of 1516 adolescents, and 339 (33%) of 1030 parents. Respondents were generally representative of the U.S. population. Vaccine effectiveness was the most influential factor in the choice to vaccinate for all groups. Other most influential factors were primary care provider (PCP) recommendation and the out-of-pocket cost of the vaccine. Other factors such as risk of illness, risk of vaccine side effects, vaccination location, and time for vaccination were not important in the decision to get vaccinated.

Conclusions

Adults, adolescents, and parents are most sensitive to vaccine effectiveness, PCP recommendation, and out-of-pocket cost for vaccination in their decision to get vaccinated. Strong PCP recommendations that focus on vaccine effectiveness and health care policies that minimize out-of-pocket costs for vaccinations may increase vaccine uptake by adults and adolescents.

Electronic supplementary material

The online version of this article (10.1186/s41687-019-0135-0) contains supplementary material, which is available to authorized users.

HPV vaccination has not increased sexual activity or accelerated sexual debut in a college-aged cohort of men and women

Background

The human papillomavirus (HPV) is the most common sexually transmitted infection and is linked to several types of cancer. HPV vaccination uptake in the U.S. is relatively low, despite the vaccine’s high efficacy. Some parents of adolescents have concerns that vaccination will encourage sexual behavior and therefore choose not to vaccinate. Previous studies investigating vaccination and sexual behavior have included only young women and girls.

Methods

The objective of this study is to assess associations between HPV-vaccination and sexual behavior in a college-age cohort of both men and women. We analyzed questionnaire data collected from the Michigan HPV and Oropharyngeal Cancer Study, a cohort study designed to investigate HPV infection and its association with sexual behavior (data collected 2015–17, Ann Arbor, MI). Here, we consider vaccination status, sexual behavior, and substance use among 241 college-aged men and women. Logistic, Poisson, and Cox regression were used to determine the relationship between probability of sexual debut, number of sexual partners, and HPV vaccination status at baseline as well as between age at sexual debut and vaccination status at debut.

Results

HPV vaccination status was not significantly associated with an increased likelihood of sexual debut (odds ratio: 0.80 (95% CI: 0.41–1.58), decreased age of sexual debut (hazard ratio: 0.81 (95% CI: 0.65–1.00), nor an increased number of sexual partners (per year sexually active; incidence rate ratio: 1.27 (95% CI: 0.86–1.87)) in this cohort, after controlling for age, race, sex, and substance use. Instead, race or alcohol use were independent predictors of sexual behavior.

Conclusions

Concerns about the influence of the HPV vaccine on sexual behavior are likely unfounded for both men and women. These results can aid in increasing vaccine acceptability, inform and strengthen physician recommendations, and ultimately reduce the burden of HPV and HPV-related cancers in the U.S.

Electronic supplementary material

The online version of this article (10.1186/s12889-019-7134-1) contains supplementary material, which is available to authorized users.

Knowledge, Attitudes, and Behaviors of Parents towards Recommended Adult Vaccinations: An Explanatory Survey in the Geographic Area of Naples, Italy

The purposes of this study were to explore the knowledge, attitudes, and behaviors towards the recommended vaccinations for adults between 19–64 years of age and the associated factors among parents. The survey was conducted from October to December 2018 among a sample of parents randomly selected from five preschools and primary, secondary, and high schools in the geographic area of Naples, Italy. The mean age of participants was 45.2 years (range 19–71). Only 16% of the parents knew all vaccinations recommended to adults between 19–64 years of age. Those being healthcare professionals, having a chronic condition, having received information about vaccinations from physicians, and having a lower educational level were more likely to know the vaccinations recommended to adults between 19–64 years of age. Female participants, those who had received information about vaccinations from physicians, and those who had a lower number of children were more likely to have a positive attitude toward the usefulness of the administration of vaccinations recommended to adults between 19–64 years of age. Among unvaccinated respondents, more than half reported a positive attitude toward willingness to receive a recommended vaccination. This positive attitude was significantly higher among those who considered vaccinations as being useful and among who had received information from physicians. Only 16.9% self-reported to have received at least one vaccination recommended to adults between 19–64 years of age. Those who were healthcare professionals, who had at least one chronic condition, and who considered the administration of the vaccinations as being useful were more likely to have received at least one recommended vaccination. Greater efforts by policy makers and healthcare providers are needed to increase parents’ knowledge on recommended vaccines, and it is also crucial that healthcare providers have a high knowledge and favorable attitudes in order to increase vaccine coverage.

HPV Vaccine: Updates and Highlights

HPV is the most common sexually transmitted biological agent and is the cause of many conditions in men and women, including precancer lesions and cancer. Three prophylactic HPV vaccines targeting high-risk HPV types are available in many countries worldwide: 2-, 4- and 9-valent vaccines. All the 3 vaccines use recombinant DNA technology and are prepared from the purified L1 protein that self-assembles to form HPV type-specific empty shells. This non-systematic review aims to summarize the HPV epidemiology and the vaccine development to review the landmark trials of HPV vaccine, to present to most remarkable results from clinical trials and the real world, and to stress the challenges and the barriers for HPV vaccine implementation.