Individual- and regional-level determinants of human papillomavirus (HPV) vaccine refusal: the Ontario Grade 8 HPV vaccine cohort study

Estimates and determinants of HPV non-vaccination in 14-year-old Canadians: Results from the childhood national immunization coverage survey, 2019

Human papillomavirus (HPV) infections, the most common sexually transmitted infections, are associated with various health outcomes including anogenital warts and cancers. Despite significant investments in HPV vaccination programs, ensuring adequate vaccination coverage for adolescents remains a challenge in Canada. This analysis used data collected through the 2019 Childhood National Immunization Coverage Survey (CNICS) to determine national estimates of HPV non-vaccination and investigate determinants of HPV non-vaccination for adolescents aged 14-years old in Canada, both overall and stratified by gender. The primary outcome of interest was HPV vaccination status, categorized as vaccinated with at least one dose or unvaccinated. Simple and multiple logistic regression models were used to investigate determinants of HPV non-vaccination. In 2019, an estimated 19.8% of the 14-year-olds in Canada were unvaccinated for the HPV vaccine, with males having higher non-vaccination rates than females (27.0% compared to 12.9%). In the unstratified analysis, factors associated with HPV non-vaccination for 14-year-olds were gender and region of residence. These factors differed by gender - for males, region of residence and respondent's age were significant factors, whereas for females, total household income was a significant factor. These results could help public health officials and policymakers develop and implement tailored interventions to enhance the delivery of HPV vaccination programs for male and female adolescents. By targeting populations that are under-vaccinated, vaccine uptake could be better facilitated to help reduce inequalities in access to the HPV vaccine, which could also potentially reduce disparities in HPV-related health outcomes.

What Influences Parents on Their Decision to Vaccinate Their Daughters Against HPV?

STUDY OBJECTIVE

To investigate and compare the attitudes of parents who initiated their daughters' HPV vaccination with parents who did not.

METHODS

Data were collected through telephone interviews with a close-end questionnaire on parents' knowledge, attitudes towards the vaccine, and the reasons for vaccinating or not their daughters against HPV. The sample was random, stratified by geographic region and urbanization level, national, and representative of the general population of parents of girls aged 11-18 in Greece. Statistical analysis consisted of descriptives, an inferential analysis with hypothesis testing, and a logistic regression model.

RESULTS

Overall, 996 parents were included in the analysis, 99.0% of which were women. Forty-seven percent of them initiated their daughters' HPV vaccination, with physician recommendation stated as the most important reason for this decision (50.2%). For those who had not initiated their daughters' HPV vaccination (53%), lack of information was the most important reason (25.6%). In the hypothesis testing, parents with unvaccinated daughters agreed more with the statements "I do not have enough information for the HPV vaccine to decide," and "My child is very young to be vaccinated for an STD" (P < .05), but no significant difference found for the statement "It's more possible for a vaccinated girl to begin sexual activities" (P > .05).

CONCLUSIONS

Lack of information, young age of the daughter, and perceived effectiveness of the vaccine are the most important hesitation factors. Physician recommendation is the most important reason to initiate vaccination.

Individual and Geospatial Determinants of Health Associated With School-Based Human Papillomavirus Immunization in Alberta: Population-Based Cohort Study

BACKGROUND

Human papillomavirus (HPV) infection causes nearly all cervical cancer cases and is a cause of anogenital and oropharyngeal cancers. The incidence of HPV-associated cancers is inequitable, with an increased burden on marginalized groups in high-income countries. Understanding how immunization status varies by material and social deprivation, health system, and geospatial factors is valuable for prioritizing and planning HPV immunization interventions.

OBJECTIVE

The objective of this study was to describe school-based HPV immunization rates by individual and geospatial determinants of health in Alberta, Canada.

METHODS

Health administrative data for male and female individuals born in 2004 in Alberta were used to determine HPV immunization status based on age and the number of doses administered in schools during the 2014/2015-2018/2019 school years. Immunization status and its relationship with material and social deprivation and health system factors were assessed by a logistic regression model. Geospatial clustering was assessed using Getis-Ord Gi* hot spot analysis. Mean scores of material and social deprivation and health system factors were compared between hot and cold spots without full HPV immunization using independent samples t tests. A multidisciplinary team comprising researchers and knowledge users formed a co-design team to design the study protocol and review the study results.

RESULTS

The cohort consisted of 45,207 youths. In the adjusted model, the odds of those who did not see their general practitioner (GP) within 3 years before turning 10 years old and not being fully immunized were 1.965 times higher (95% CI 1.855-2.080) than those who did see their GP. The odds of health system users with health conditions and health system nonusers not being fully immunized were 1.092 (95% CI 1.006-1.185) and 1.831 (95% CI 1.678-1.998) times higher, respectively, than health system users without health conditions. The odds of those who lived in areas with the most material and social deprivation not being fully immunized were 1.287 (95% CI 1.200-1.381) and 1.099 (95% CI 1.029-1.174) times higher, respectively, than those who lived in areas with the least deprivation. The odds of those who lived in rural areas not being fully immunized were 1.428 times higher (95% CI 1.359-1.501) than those who lived in urban areas. Significant hot spot clusters of individuals without full HPV immunization exist in rural locations on the northern and eastern regions of Alberta. Hot spots had significantly worse mean material deprivation scores (P=.008) and fewer GP visits (P=.001) than cold spots.

CONCLUSIONS

Findings suggest that material and social deprivation, health system access, and rural residency impact HPV immunization. Such factors should be considered by public health professionals in other jurisdictions and will be used by the Alberta co-design team when tailoring programs to increase HPV vaccine uptake in priority populations and regions.

Corona virus vaccine hesitancy among higher education students in Adama City, Oromia, Ethiopia

Background

Vaccination stands as the most efficient approach for managing the continued transmission of infections and preventing the emergence of novel variants. Coronavirus disease 2019 (COVID-19) vaccine hesitancy poses a significant burden in the fight to achieve herd immunity.

Methods

A cross-sectional study, based on institutional parameters, was conducted among a cohort of 530 higher education students, selected via a simple random sampling method. Study participants were selected using a systematic random sampling technique from February to March 2022. Structured questionnaire data were gathered and subsequently analyzed using SPSS version 21. The strength of the association between various factors and COVID-19 vaccine hesitancy was assessed using the odds ratio along with its 95% confidence interval. Statistical significance was deemed to be present at a p-value of < 0.05.

Result

The prevalence of coronavirus vaccine hesitancy was 47.5%. The factors that were found to be significantly associated with COVID-19 vaccine hesitancy were residential address (AOR = 2.398, 95% CI: 1.476-3.896); agreeing with leaders and groups that do not support COVID-19 vaccination (AOR = 2.292, 95% CI: 1.418-3.704); coming from a community whose leaders support COVID-19 vaccination for young adults (AOR = 0.598, 95% CI: 0.381-0.940), and believing that COVID-19 vaccines are safe (AOR = 0.343,95% CI: 0.168-0.701).

Conclusion

Approximately five out of 10 students who participated in this study were hesitant to get vaccinated against coronavirus. Incorporating messages and initiatives into local plans to specifically target the factors identified in this study is imperative for substantially increasing the COVID-19 vaccine uptake among students in higher education institutions.

Barriers and facilitators in uptake of human papillomavirus vaccine across English Canada: A review

Human Papillomavirus (HPV) is a highly contagious sexually transmitted infection that leads to preventable cancers of the mouth, throat, cervix, and genitalia. Despite the wide availability of HPV Vaccine (HPVV) in Canada, its uptake remains suboptimal. This review aims to identify factors (barriers and facilitators) in HPV vaccine uptake across English Canada at three levels (provider, system, and patient). We explored academic and gray literature to examine factors involved in HPVV uptake and synthesized results based on interpretive content analysis. The review identified the following factors of prime significance in the uptake of the HPV vaccine (a) at the provider level, 'acceptability' of the HPV vaccine, and 'appropriateness' of an intervention (b) at the patient level, the 'ability to perceive' and 'knowledge sufficiency' (c) at the system level, 'attitudes' of different players in vaccine programming, planning and delivery. Further research is needed to conduct population health intervention research in this area.

Factors influencing human papillomavirus school-based immunization in Alberta: A mixed-methods study protocol

More than 1,300 Canadians are diagnosed with cervical cancer annually, which is nearly preventable through human papillomavirus (HPV) immunization. Across Canada, coverage rates remain below the 90% target set out by the Action Plan for the Elimination of Cervical Cancer in Canada (2020-2030). To support this Plan, the Canadian Partnership Against Cancer has commissioned the Urban Public Health Network (UPHN) to coordinate a quality improvement project with Canada's school-based HPV immunization programs. In Alberta, the UPHN partnered with Alberta Health Services (AHS) for this work. This study has one overarching research question: what are parent/guardian and program stakeholder perceived barriers, enablers and opportunities to immunization for youth as part of the school-based HPV immunization program in Alberta? This study uses a mixed-methods sequential explanatory design. A survey will be emailed to a sample of Albertans with children aged 11-17 years. Questions will be based on a Conceptual Framework of Access to Health Care. Subsequent qualitative work will explore the survey's findings. Parents/guardians identifying as vaccine hesitant in the survey will be invited to participate in virtual, semi-structured, in-depth interviews. Stakeholders of the school-based immunization program will be purposively sampled from AHS' five health zones for virtual focus groups. Quantitative data will be analyzed using SAS Studio 3.6 to carry out descriptive statistics and, using logistic regression, investigate if Framework constructs are associated with parents'/guardians' decision to immunize their children. Qualitative data will be analyzed using NVivo 12 to conduct template thematic analysis guided by the Framework. Study results will provide insights for Alberta's public health practitioners to make evidence-informed decisions when tailoring the school-based HPV immunization program to increase uptake in vaccine hesitant populations. Findings will contribute to the national study, which will culminate in recommendations to increase HPV immunization uptake nationally and progress towards the 90% coverage target.

Geographic disparities and socio-demographic predictors of pertussis risk in Florida

BACKGROUND

Pertussis is a toxin-mediated respiratory illness caused by Bordetella pertussis that can result in severe complications and death, particularly in infants. Between 2008 and 2011, children less than 3 months old accounted for 83% of the pertussis deaths in the United States. Understanding the geographic disparities in the distribution of pertussis risk and identifying high risk geographic areas is necessary for guiding resource allocation and public health control strategies. Therefore, this study investigated geographic disparities and temporal changes in pertussis risk in Florida from 2010 to 2018. It also investigated socioeconomic and demographic predictors of the identified disparities.

METHODS

Pertussis data covering the time period 2010-2018 were obtained from Florida HealthCHARTS web interface. Spatial patterns and temporal changes in geographic distribution of pertussis risk were assessed using county-level choropleth maps for the time periods 2010-2012, 2013-2015, 2016-2018 and 2010-2018. Tango's flexible spatial scan statistics were used to identify high-risk spatial clusters which were displayed in maps. Ordinary least squares (OLS) regression was used to identify significant predictors of county-level risk. Residuals of the OLS model were assessed for model assumptions including spatial autocorrelation.

RESULTS

County-level pertussis risk varied from 0 to 116.31 cases per 100,000 people during the study period. A total of 11 significant (p < 0.05) spatial clusters were identified with risk ratios ranging from 1.5 to 5.8. Geographic distribution remained relatively consistent over time with areas of high risk persisting in the western panhandle, northeastern coast, and along the western coast. Although county level pertussis risks generally increased from 2010-2012 to 2013-2015, risk tended to be lower during the 2016-2018 time period. Significant predictors of county-level pertussis risk were rurality, percentage of females, and median income. Counties with high pertussis risk tended to be rural (p = 0.021), those with high median incomes (p = 0.039), and those with high percentages of females (p < 0.001).

CONCLUSION

There is evidence that geographic disparities exist and have persisted over time in Florida. This study highlights the application and importance of Geographic Information Systems (GIS) technology and spatial statistical/epidemiological tools in identifying areas of highest disease risk so as to guide resource allocation to reduce health disparities and improve health for all.

Older adolescents and young adults willingness to receive the COVID-19 vaccine: Implications for informing public health strategies

Importance

The success in ending the COVID-19 pandemic rests partly on the mass uptake of the COVID-19 vaccine. Little work has been done to understand vaccine willingness among older adolescents and young adults. This is important since this age group may be less likely to adhere to public health guidelines.

Objective

To understand willingness of getting a vaccine and reasons for vaccine hesitancy among a sample of older adolescents and young adults.

Design

Data were from the Well-Being and Experiences study (The WE Study), a longitudinal community-based sample of older adolescents and young adults collected from Winnipeg, Manitoba, Canada from 2017 to 2020 (n = 664).

Setting

The study setting was a community-based observational longitudinal study.

Participants

Participants for the study were aged 14 to 17 years old at baseline in 2016–17 (n = 1000). Data were also collected on one parent/caregiver. Waves 2 (n = 747) and 3 (n = 664) were collected in 2019 and 2020, respectively.

Exposures

The main exposures were sociodemographic factors, health conditions, COVID-19 knowledge, and adversity history.

Main Outcomes

The main outcomes were COVID-19 vaccine willingness, hesitancy, and reasons for hesitancy.

Results

Willingness to get a COVID-19 vaccine was 65.4%. Willingness did not differ by age, sex, or mental health conditions, but did differ for other sociodemographic characteristics, physical health conditions, COVID-19 knowledge, practicing social/physical distancing, and adversity history. The most common reasons for not wanting a vaccine were related to safety, knowledge, and effectiveness. Sex differences were noted.

Conclusions and Relevance

Increasing uptake of the COVID-19 vaccine among older adolescents and young adults may rely on targeting individuals from households with lower income, financial burden, and adversity history, and generating public health messaging specifically aimed at vaccine safety, how it works to protect against illness, and why it is important to protect oneself against a COVID-19 infection.

Human Papillomavirus (HPV) Health Savings as an Alternative Solution: HPV Vaccination Behavior in Adolescents

OBJECTIVE

This study aimed to measure the effects of reproductive health savings (tabungan kesehatan reproduksi, Takespro) on human papillomavirus (HPV) vaccine initiation program and the quality of the decision making to get vaccinated, as measured by knowledge, attitudes, beliefs, and self-efficacy toward HPV vaccination.

METHODS

This quasi-experimental study was conducted on 128 students randomly allocated to intervention and control groups. This research was conducted in junior high schools. The intervention group received the health education "Takespro HPV" intervention through videos and booklets for 6 months at school. Participants in the control group received usual care from the school. Data were collected using a questionnaire of knowledge, attitudes, beliefs, and self-efficacy about HPV vaccination modified by researchers based on previous research and tested for validity and reliability. Data were analyzed using Mann-Whitney test and independent t-test.

RESULTS

A total of 40 participants were actively enrolled in the intervention group, and 88 were passively enrolled in the control group. The health education that was part of the Takespro HPV intervention improved the knowledge (p < 0.05) and self-efficacy (p < 0.05) of the intervention group compared with the control group. The attitude and belief variables showed no significant difference (p > 0.05). Forty students exhibited the health reproduction savings behavior at schools. However, the savings amount was insufficient to get HPV vaccination at the initiation phase.

CONCLUSION

"Takespro" HPV intervention can be considered an alternative to increasing the coverage of HPV vaccination in adolescents in Yogyakarta.
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Evaluation of the acceptability in France of the vaccine against papillomavirus (HPV) among middle and high school students and their parents

BACKGROUND

The pathogenic and oncogenic roles of papillomavirus (HPV) infections have been documented and shown to occur in women as well as in men. While other countries have already extended their vaccination guidelines to include boys, in 2019 the French National Authority for Health validated implementation of HPV vaccination in the 2020 vaccination schedule. There is, however, a climate of distrust in regard to vaccination in France, and there have been few studies to date regarding the acceptability of HPV vaccination in boys in France. The aim of this study was, therefore, to evaluate the acceptability of extending the recommendations for HPV vaccination in men, among middle and high school students and their parents.

METHODS

Our study (HPVac) was a prospective, multicenter, departmental, and descriptive survey applied to a sample of male middle and high school students attending schools in the Loire-Atlantique department and their parents. It took place from January 2017 to January 2018.

RESULTS

We analyzed the information obtained from 127 parent questionnaires and 145 children questionnaires. In terms of acceptability, 36.6% (n = 53) of the children and 37.8% (n = 48) of the parents were in favour of being vaccinated or of having their children vaccinated against HPV (51.7% (n = 75) and 50.4% (n = 64), respectively, were undecided). The perception of a risk stemming from HPV infection was positively associated with acceptability of the HPV vaccine. Being against vaccines in general, being discouraged by their parents, parents thinking that their child is not at risk, and the belief that the vaccine is not mandatory were arguments cited and significantly associated with a willingness to be vaccinated.

CONCLUSION

This study revealed a lack of information among boys and their parents about HPV and its vaccination. It also clearly showed that taking time to discuss the consequences of an infection and the merits of being vaccinated can help parents overcome their reluctance. The children then generally go along with their parent's choice.

Vaccination in people with disability: a review

People with disabilities are vulnerable to complications from vaccine-preventable diseases, and every effort should be made to ensure equitable access to immunization for this population. This paper aims to summarize the research on immunizations in people with disabilities, in order to ensure a comprehensive understanding of knowledge in this area and direct further research. The literature is weighted towards coverage data that is difficult to synthesize because of the different definitions of disability, and the variety of settings, vaccinations and age groups across the studies. In-depth qualitative data and data from a variety of health-care providers and people with disability is notably lacking. This is vital to redress in order to develop effective immunization interventions in this population.

Determinants of vaccine hesitancy in Quebec: a large population-based survey

Objectives: Vaccine hesitancy is a global phenomenon that needs to be measured and addressed. This study aimed to identify the determinants of vaccine hesitancy among a large regional population.Methods: A structured telephone survey was administered to a random digit sample in Quebec's Eastern Townships region. In addition to socioeconomic information, respondents were asked questions on several health topics such as knowledge and beliefs about immunization, medical consultations, health status, and life habits. Data were weighted according to age, sex, and territories. Statistically significant variables in the univariate analysis were introduced into a multivariate logistic regression model to determine independent factors for vaccine hesitancy (adjusted odds ratios [aOR] and 95% confidence intervals).Results: A total of 8,737 interviews were conducted (participation rate 48.3%). Among all respondents, 32.2% were vaccine-hesitant. Several beliefs were significantly associated with vaccine hesitancy: belief that children receive too many vaccines (aOR = 2.72; 2.32-3.18), belief that a healthy lifestyle can eliminate the need for vaccination (aOR = 2.48; 2.09-2.93), and belief that the use of alternative medicine practices can eliminate the need for vaccination (aOR = 1.39; 1.16-1.68). Other determinants associated with vaccine hesitancy were having consulted a massage therapist (aOR = 2.34; 1.46-3.75), not being vaccinated against influenza (aOR = 1.80; 1.49-2.16), having a low (<$30,000) (aOR = 1.58; 1.24-2.02) or moderate ($30,000-$79,000) (aOR = 1.37; 1.12-1.67) household income, distrust in public health authorities (aOR = 1.40; 1.21-1.63), perceived insufficient knowledge about immunization (aOR = 1.26; 1.04-1.51), and smoking (aOR = 1.22; 1.01-1.47).Conclusions: Many determinants are related to vaccine hesitancy. These determinants should be taken into account when health professionals engage with vaccine-hesitant individuals.

The uptake of adolescent vaccinations through the School Immunisation Program in specialist schools in Victoria, Australia

BACKGROUND

As part of the National Immunisation Program (NIP) students in Australia receive adolescent immunisations through the School Immunisation Program at 12 to 13 years. For children with disabilities attending specialist schools, no vaccine uptake data is collected at this time point. We aimed to determine uptake of diphtheria-tetanus-pertussis (dTpa) and Human Papillomavirus (HPV) immunisations amongst young people with disabilities in specialist schools in Victoria.

METHODS

A prospective cohort study was conducted in Victoria, Australia. Data was collected on immunisation days in the 2017 school year from specialist schools in Victoria. The school immunisation coordinator entered data online for eligible students for receipt of dTpa and HPV on each school immunisation day. Demographic data, motor and intellectual function of students and reasons for non-receipt of dTpa and HPV vaccine were recorded. Data were analysed using descriptive statistics.

RESULTS

Of 73 eligible specialist schools in Victoria, 28 (38%) participated. dTpa was received by 63% (237/374) of participating students and HPV dose 1 (HPV1) was received by 66% (76/114) females and 67% (174/260) male students respectively. Three doses of HPV were received by only 41% (100/241) of students. The main reasons for missed immunisation were absence from school, lack of consent and inability to immunise due to the student's behaviour and/or anxiety.

CONCLUSION

This is the first study in Australia to report that uptake of adolescent immunisations in specialist schools for young people with a disability is significantly lower than in mainstream settings. Comparative data during the same time period for students in mainstream schools demonstrated higher uptake, at 89% for dTpa and 75% for three doses of HPV. These data highlight the inequity of receipt of school-based immunisations for this group of adolescents, the barriers to which could be more thoroughly explored through qualitative inquiry from a socio-ecological perspective.

Discrepancies in the evaluation of the safety of the human papillomavirus vaccine

Despite being more than ten years since its introduction, global acceptance to the human papillomavirus (HPV) vaccine is still low. The immunogenetic background of the host, and HPV antigen recognition, are important in natural HPV infection, and should be taken into account in the understanding of adverse autoimmune reactions by the HPV vaccine in certain groups. There is no doubt of the benefit of vaccines in the reduction of the incidence of infectious diseases, and in the case of HPV, the prevention of persistent infection that would lead to cervical cancer. Side-effects, however, should be closely monitored and reported without any bias, to ensure that the benefits of vaccines outweigh the risks of adverse reactions. In this article we bring the attention on certain adverse effects of the vaccine against HPV that have not been well studied as they are not well defined. We also compare the different approaches on HPV vaccine policies regarding its adverse reactions in countries like Japan and Colombia, vs. the recommendations issued by the WHO.

Quadrivalent human papillomavirus vaccination in girls and the risk of autoimmune disorders: the Ontario Grade 8 HPV Vaccine Cohort Study

BACKGROUND

Despite demonstrated effectiveness in real-world settings, concerns persist regarding the safety of the quadrivalent human papillomavirus (HPV4) vaccine. We sought to assess the risk of autoimmune disorders following HPV4 vaccination among grade 8 girls eligible for Ontario's school-based HPV vaccination program.

METHODS

We undertook a population-based retrospective cohort study using Ontario's administrative health and vaccination databases from 2007 to 2013. The self-controlled case series method was used to compare the rate of a composite end point of autoimmune disorders diagnosed during days 7-60 post-vaccination ("exposed" follow-up) to that at any other time ("unexposed"). The analysis was repeated to assess the effect of a history of immune-mediated diseases and time since vaccination. We also conducted an exploratory analysis of individual autoimmune disorders. Rate ratios and 95% confidence intervals (CIs) were estimated using conditional Poisson regression, adjusted for age, seasonality, concomitant vaccinations and infections.

RESULTS

The study cohort consisted of 290 939 girls aged 12-17 years who were eligible for vaccination between 2007 and 2013. There was no significant risk for developing an autoimmune disorder following HPV4 vaccination (n = 681; rate ratio 1.12, 95% CI 0.85-1.47), and the association was unchanged by a history of immune-mediated disorders and time since vaccination. Exploratory analyses of individual autoimmune disorders found no significant risks, including for Bell palsy (n = 65; rate ratio 1.73, 95% CI 0.77-3.89), optic neuritis (n = 67; rate ratio 1.57, 95% CI 0.74-3.33) and Graves disease (n = 47; rate ratio 1.55, 95% CI 0.92-2.63).

INTERPRETATION

We did not observe an increased risk of autoimmune disorders following HPV4 vaccination among teenaged girls. These findings should reassure parents and health care providers.

HPV vaccination and risk of chronic fatigue syndrome/myalgic encephalomyelitis: A nationwide register-based study from Norway

BACKGROUND

Vaccination has been suggested to be involved in the aetiology of chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME). HPV vaccine was introduced in the Norwegian Childhood Immunisation Programme and offered 12year old girls from 2009. We studied the association between HPV vaccination and risk of CFS/ME and also assessed medical history in relation to both risk of CFS/ME and HPV vaccine uptake.

METHODS

Individual data from national registries, including the Norwegian Population Registry, the Norwegian Patient Registry and the Norwegian Immunisation Registry were linked using the unique personal identification number. Yearly incidence rates of CFS/ME for 2009-2014 were calculated among the 824,133 boys and girls, aged 10-17 living in Norway during these 6years. A total of 176,453 girls born 1997-2002 were eligible for HPV vaccination and included in further analyses. Hazard ratios (HRs) of CFS/ME were estimated using Cox regression. Risk differences (RDs) of vaccine uptake were estimated with binomial regression.

RESULTS

A similar yearly increase in incidence rate of CFS/ME was observed among girls and boys, IRR=1.15 (95% confidence interval (CI) 1.10-1.19) and 1.15 (95% CI 1.09-1.22), respectively. HPV vaccination was not associated with CFS/ME, HR=0.86 (95% CI 0.69-1.08) for the entire follow-up period and 0.96 (95% CI 0.64-1.43) for the first two years after vaccination. The risk of CFS/ME increased with increasing number of previous hospital contacts, HR=5.23 (95% CI 3.66-7.49) for 7 or more contacts as compared to no contacts. Girls with 7 or more hospital contacts were less likely to be vaccinated than girls with no previous hospital contacts, RD=-5.5% (95% CI -6.7% to -4.2%).

CONCLUSIONS

No indication of increased risk of CFS/ME following HPV vaccination was observed among girls in the first 6 birth cohorts offered HPV vaccine through the national immunisation programme in Norway.

Pharmacotherapeutic Considerations for Individuals with Down Syndrome

Down syndrome (DS; trisomy 21) is the most common survivable disorder due to aneuploidy. Individuals with DS may experience multiple comorbid health problems including congenital heart defects, endocrine abnormalities, skin and dental problems, seizure disorders, leukemia, dementia, and obesity. These associated conditions may necessitate pharmacotherapeutic management with various drugs. The complex pathobiology of DS may alter drug disposition and drug response in some individuals. For example, reports have documented increased rates of adverse drug reactions in patients with DS treated for leukemia and dementia. Intellectual disability resulting from DS may impact adherence to medication regimens. In this review, we highlight literature focused on pharmacotherapy for individuals with DS. We discuss reports of altered drug disposition or response in patients with DS and explore social factors that may impact medication adherence in the DS setting. Enhanced monitoring during drug therapy in individuals with DS is justified based on reports of altered drug disposition, drug response, and other characteristics present in this population.

Vaccine acceptance, hesitancy and refusal in Canada: Challenges and potential approaches

"Vaccine hesitancy" is a concept used frequently in vaccination discourse and is challenging previously held perspective that individual vaccination attitudes and behaviours are a simple dichotomy of accept or reject. Given the importance of achieving high vaccine coverage in Canada to avoid vaccine preventable diseases and their consequences, vaccine hesitancy is an important issue that needs to be addressed. This article describes the scope and causes of vaccine hesitancy in Canada and proposes potential approaches to address it.

Parental Refusal of the Human Papillomavirus Vaccine

INTRODUCTION

The purpose of this study was to explore reasons why parents may defer administration of the human papillomavirus (HPV) vaccine to their children. The literature suggests that parents choose to defer administration of this vaccine for several reasons. Data from this pilot study will contribute to our understanding of why parents defer administration of the vaccine.

METHOD

This mixed-methods study took place in a pediatric practice. After a health care visit in which the vaccine was deferred, a survey was provided to the parent in a private room. The survey was confidential and anonymous.

RESULTS

A total of 23 surveys were completed. Demographic data were reported. Data were analyzed for descriptive statistics and themes from open-ended questions. The majority of parents (75%) deferred administration of the HPV vaccine because they believed it was too new or required further research.

DISCUSSION

Nurse practitioners are in an excellent position to dispel myths and clarify information about HPV vaccination. The data are useful in communicating with parents and promoting best practices to facilitate good health in children.

Understanding Vaccine Hesitancy in Canada: Results of a Consultation Study by the Canadian Immunization Research Network

"Vaccine hesitancy" is a concept now frequently used in vaccination discourse. The increased popularity of this concept in both academic and public health circles is challenging previously held perspectives that individual vaccination attitudes and behaviours are a simple dichotomy of accept or reject. A consultation study was designed to assess the opinions of experts and health professionals concerning the definition, scope, and causes of vaccine hesitancy in Canada. We sent online surveys to two panels (1- vaccination experts and 2- front-line vaccine providers). Two questionnaires were completed by each panel, with data from the first questionnaire informing the development of questions for the second. Our participants defined vaccine hesitancy as an attitude (doubts, concerns) as well as a behaviour (refusing some / many vaccines, delaying vaccination). Our findings also indicate that both vaccine experts and front-line vaccine providers have the perception that vaccine rates have been declining and consider vaccine hesitancy an important issue to address in Canada. Diffusion of negative information online and lack of knowledge about vaccines were identified as the key causes of vaccine hesitancy by the participants. A common understanding of vaccine hesitancy among researchers, public health experts, policymakers and health care providers will better guide interventions that can more effectively address vaccine hesitancy within Canada.

Estimates and determinants of HPV non-vaccination and vaccine refusal in girls 12 to 14 y of age in Canada: Results from the Childhood National Immunization Coverage Survey, 2013

Since the introduction of HPV vaccination programs in Canada in 2007, coverage has been below public health goals in many provinces and territories. This analysis investigated the determinants of HPV non-vaccination and vaccine refusal. Data from the Childhood National Immunization Coverage Survey (CNICS) 2013 were used to estimate the prevalence of HPV non-vaccination and parental vaccine refusal in girls aged 12-14 years, for Canada and the provinces and territories. Multivariate logistic regression was used to examine factors associated with non-vaccination and vaccine refusal, after adjusting for potential confounders. An estimated 27.7% of 12-14 y old girls had not been vaccinated against HPV, and 14.4% of parents reported refusing the vaccine. The magnitude of non-vaccination and vaccine refusal varied by province or territory and also by responding parent's country of birth. In addition, higher education was associated with a higher risk of refusal of the HPV vaccine. Rates of HPV non-vaccination and of refusal of the HPV vaccine differ and are influenced by different variables. These findings warrant further investigation.

Impact of socio-economic status on hospital length of stay following injury: a multicenter cohort study

BACKGROUND

Injury is second only to cardiovascular disease in terms of acute care costs in North America. One key to improving injury care efficiency is to generate knowledge on the determinants of resource use. Socio-economic status (SES) is a documented risk factor for injury severity and mortality but its impact on length of stay (LOS) for injury admissions is unknown. This study aimed to examine the relationship between SES and LOS following injury. This multicenter retrospective cohort study was based on adults discharged alive from any trauma center (2007-2012; 57 hospitals; 65,486 patients) in a Canadian integrated provincial trauma system. SES was determined using ecological indices of material and social deprivation. Mean differences in LOS adjusted for age, gender, comorbidities, and injury severity were generated using multivariate linear regression.

RESULTS

Mean LOS was 13.5 days. Patients in the highest quintile of material/social deprivation had a mean LOS 0.5 days (95 % CI 0.1-0.9)/1.4 days (1.1-1.8) longer than those in the lowest quintile. Patients in the highest quintiles of both social and material deprivation had a mean LOS 2.6 days (1.8-3.5) longer than those in the lowest quintiles.

CONCLUSIONS

Results suggest that patients admitted for traumatic injury who suffer from high social and/or material deprivation have longer acute care LOS in a universal-access health care system. The reasons behind observed differences need to be further explored but may indicate that discharge planning should take patient SES into consideration.