Determinants of Human Papillomavirus Vaccine Uptake by Adult Women Attending Cervical Cancer Screening in 9 European Countries

Recovery from HPV vaccination deficits caused by the COVID-19 pandemic in Germany: a modeling study of catch-up HPV vaccination among adolescent girls

Health care disruptions associated with the COVID-19 pandemic have caused persistent decreases in human papillomavirus (HPV) vaccination uptake in Germany. The objective of this study was to estimate the cumulative deficit in first doses of the HPV vaccine administered to girls in Germany since the beginning of the pandemic and the projected time to recover from this deficit at different catch-up vaccination uptake levels, focusing on girls 9-14 years of age. This study used a published HPV vaccination modeling tool. Retrospective vaccination data from 2019 were used to calculate the baseline vaccination rate, while data from 1 January 2020 to 31 December 2023 were used to estimate the size and duration of the HPV vaccination deficit accrued since the beginning of the COVID-19 pandemic. We modeled scenarios in which the rate of monthly vaccinations increased from the 2023 average to 5%, 10%, or 15% above the baseline 2019 level. The average monthly number of first doses of HPV vaccine administered to girls 9-14 years of age was 7.4% below the 2019 baseline level in 2020, 21.2% below baseline in 2021, 21.0% below baseline in 2022, and 19.5% below baseline in 2023. At a catch-up vaccination uptake of 5-15% above the 2019 baseline, there would be an estimated accumulated deficit of 267,052-285,798 first doses by 31 December 2024 that would clear between October 2029-April 2040. A catch-up vaccination uptake of 12.3% (11.9-12.7%) every month above baseline would be needed to clear the accumulated deficit by the end of 2030. Conclusions: Significant HPV vaccination deficits have accrued in Germany since the beginning of the COVID-19 pandemic. Sustained efforts to vaccinate the affected cohorts are now needed to mitigate the long-term impacts of the vaccination deficit. What is known: • Health care disruptions associated with the COVID-19 pandemic have caused persistent decreases in human papillomavirus (HPV) vaccination uptake in Germany. What is new: • Our model projected that the HPV vaccination deficit would be cleared between October 2029 (15% above the 2019 baseline level) and April 2040 (5% above the 2019 baseline level). • A catch-up rate of 12.3% (11.9-12.7%) above the 2019 baseline level would be needed to clear the HPV vaccination deficit by 31 December 2030. • Sustained efforts to vaccinate the affected cohorts are now needed to mitigate the long-term impacts of the accrued vaccination deficit on mortality, morbidity, and health care costs from HPV-associated diseases.

Exploration of individual socioeconomic and health-related characteristics associated with human papillomavirus vaccination initiation and vaccination series completion among adult females: A comprehensive systematic evidence review with meta-analysis

INTRODUCTION

Human papillomavirus (HPV) vaccination rates among females are lower than the World Health Organization target and vaccination rates specifically among adult females are even much lower.

METHODS

We systematically evaluated individual socioeconomic and health-related characteristics associated with HPV vaccination initiation and vaccination series completion among adult females (PROSPERO: CRD42023445721). We performed a literature search on December 14, 2022, and supplemented the search on August 1, 2023. We pooled appropriate multivariable-adjusted results using an inverse variance random-effects model and expressed the results as odds ratios with associated 95 % confidence intervals. A point pooled significantly increased/decreased odds of 30-69 % was regarded to be strongly associated, and ≥ 70 % was very strongly associated.

RESULTS

We included 63 cross-sectional studies. There were strongly increased odds of vaccination initiation among White women compared with Black or Asian women, and those with higher education, health insurance, a history of sexually transmitted infection (STI), receipt of influenza vaccination in the preceding year, not married/cohabiting, not smoking, using contraception, and having visited a healthcare provider in the preceding year. We observed very strongly increased odds of vaccination initiation among those younger and having been born in the country of study. Similarly, there were strongly increased odds of completing the vaccination series for the same variables as initiating vaccination, except for higher education, prior STI, smoking and contraception use. Additional variables associated with strongly increased odds of vaccination series completion not seen in initiation were higher annual household income, being lesbian/bisexual, and having a primary care physician. We observed very strongly increased odds of vaccination series completion similar to vaccination initiation but including for White compared with Black women, higher education, and prior cervical cancer screening.

CONCLUSIONS

These individual characteristics may be the key to identifying women at increased risk of not being vaccinated against HPV and could inform targeted messaging to drive HPV vaccination.

Understanding Prognostic Factors for Human Papillomavirus Vaccination: A Rural Community Case-Control Study

HPV vaccination coverage rates can vary depending on several factors. The main objective of this study is to identify possible independent prognostic factors that have an impact on HPV vaccination in a rural community, specifically related to sexual and reproductive health. A case-control, retrospective, community-based study was carried out on women aged 15 to 40 in the primary health centers of Southern Catalonia's Terres de l'Ebre region, Spain, from 1 January 2020 to 31 December 2022. A random sample of 520 women with an average age of 29.3 (SD 7.8) years old was included in the study. Independent prognostic factors: age OR 0.680 (95% CI: 0.635-0.729, p < 0.001), immigrant origin OR 0.215 (95% CI: 0.109-0.422, p < 0.001), and HPV PCR OR 7.402 (95% CI: 2.504-21.880, p < 0.001). The variables that showed a barrier effect for HPV vaccination were age (OR 0.680, 95% CI 0.635-0.729, p < 0.001), and immigrant origin (OR 0.215, 95% CI 0.109-0.422, p < 0.001). The variable that showed a facilitating effect for HPV vaccination was HPV PCR (OR 7.402, 95% CI 2.504-21.880, p < 0.001).

Assessment of Acceptability and Determinants of Uptake and Schedule Completion of Human Papillomavirus (HPV) Vaccine by 25 to 45 Years Old Women in Slovenia

HPV immunization programs are mainly focused on girls and boys, but adult women and men could also benefit from vaccination. A multinational CoheaHr-WP4 study investigated the acceptability of HPV vaccination among 25-45 years old women. A total of 607 women from Slovenia participated in the study, and 49.6% (301/607) agreed with HPV vaccination, with a significant difference (p < 0.0001) between the two centers. Non-vaccinated women had a higher education (p = 0.0068) and were more frequently in a committed relationship or married (p = 0.01). The most trusted source of medical and vaccination information was healthcare providers (55.2%). The main reasons for vaccine acceptance were protection against HPV-related disease (93.4%), severity of preventable diseases (82.7%), HPV vaccine safety (66.8%), free HPV vaccine availability (62.8%), and the existence of vaccination recommendations (55.5%). The main reasons for refusing vaccination were the need for additional vaccine-related information (31.4%) and vaccine safety concerns (29.4%). To increase vaccine coverage, information about the benefits and safety of HPV vaccination must be widely disseminated to all health professionals and the general public. We are convinced that the knowledge obtained in this study can be reliably applied to other countries in the region that lack such information and have a very high cervical cancer burden.

Healthcare Provider's Perceived Self-Efficacy in HPV Vaccination Hesitancy Counseling and HPV Vaccination Acceptance

BACKGROUND

HPV vaccine hesitancy is a key contributor to the sub-optimal HPV vaccination uptake in the United States. We aimed to determine the association between healthcare providers' self-efficacy in HPV vaccination hesitancy counseling and HPV vaccination acceptance after initial and follow-up counseling sessions.

METHODS

Population-based cross-sectional study of healthcare providers (HCPs) practicing in Texas. Logistic regression analyses were used to determine the odds of HPV vaccination acceptance by vaccine-hesitant patients. Additionally, generalized estimating equations were used to compare HPV vaccination acceptance by hesitant patients after follow-up versus initial counseling sessions.

RESULTS

1283 HCPs completed the survey with a mean (SD) age of 47.1 (11.3) years. HCPs who believed that they were very/completely confident in counseling HPV-vaccine-hesitant parents had higher odds of observing HPV vaccination acceptance very often/always after an initial counseling session (adjusted odds ratio (AOR): 3.50; 95% CI: 2.25-5.44) and after follow-up counseling sessions (AOR: 2.58; 95% CI: 1.66-4.00) compared to HCPs that perceived they were not at all/somewhat/moderately confident. The odds of HPV vaccination being accepted very often/always by vaccine-hesitant parents was 61% (AOR: 1.61; 95% CI: 1.32-1.95) higher after follow-up counseling sessions compared to an initial counseling session. The results were similar for the counseling of HPV-vaccine-hesitant adult patients.

CONCLUSIONS

The confidence level of HCPs in counseling hesitant parents and adult patients impacts HPV vaccination acceptance. Importantly, acceptance was higher after follow-up counseling sessions than initial counseling sessions. HCPs should receive training in HPV vaccination counseling to enhance their confidence in counseling hesitant patients and should utilize every visit to counsel hesitant patients.

Human Papillomavirus: Challenges and Opportunities for the Control of Cervical Cancer

Viruses are the most abundant and genetically diverse entities on the planet, infect all life forms and have evolved with their hosts. To date, 263 viral species have been identified that infect humans, of which only seven are considered type I oncogenic. Human papillomavirus (HPV) is the main virus associated with cancer and is responsible for practically all cases of cervical carcinoma. Screening tests for early detection have been available since the 1960s. Undoubtedly, the entailment between knowledge of HPV biology and the natural history of cervical cancer has contributed to the significant advances that have been made for its prevention since the 21^st century, with the development of prophylactic vaccines and improved screening strategies. Therefore, it is possible to eradicate invasive cervical cancer as a worldwide public health problem, as proposed by the WHO with the 90-70-90 initiative based on vaccination coverage, screening, and treatment, respectively. In addition, the emerging knowledge of viral biology generates opportunities that will contribute to strengthening prevention and treatment strategies in HPV-associated neoplasms.

HPV Vaccination Training of Healthcare Providers and Perceived Self-Efficacy in HPV Vaccine-Hesitancy Counseling

HPV vaccine hesitancy is a key barrier to HPV vaccination. Using a population-based survey of HCPs practicing in Texas we determined the association between formal training of HCPs and perceived self-efficacy in counseling HPV vaccine-hesitant parents and adult patients. A total of 1283 HCPs completed the survey, with 879 providing vaccination services to pediatric patients and 1018 providing vaccination services to adult patients. Among HCPs included in this study, 405 of 577 (70%) and 315 of 505 (62%) perceived they were very/completely confident in counseling HPV vaccine-hesitant parents and adult patients, respectively. Compared to HCPs who received no training, those who received formal training in HPV vaccination promotion or counseling had 2.56 (AOR: 2.56; 95% CI:1.69-3.86) and 2.84 times higher odds (AOR: 2.84; 95% CI:1.87-4.33) of perceiving that they were very/completely confident in counseling HPV vaccine-hesitant parents and adult patients, respectively. Additionally, increasing years of practice and volume of patients seen were positively associated with being very/completely confident in counseling HPV vaccine-hesitant parents and adult patients. On the other hand, nurses were less likely than physicians to be very/completely confident in counseling HPV vaccine-hesitant parents. To increase HPV vaccination uptake, HCPs should receive tailored training to improve their self-efficacy in addressing HPV vaccine-hesitancy.

Head-to-Head Comparison of Bi- and Nonavalent Human Papillomavirus Vaccine-Induced Antibody Responses

For head-to-head comparison of human papillomavirus (HPV) antibody levels induced by different vaccines, 25-year-old vaccine-naive women were given either the bivalent (n = 188) or the nonavalent HPV vaccine (n = 184). Six months after vaccination antibodies against pseudovirions from 17 different HPV types (HPV6/11/16/18/31/33/35/39/45/51/52/56/58/59/66/68/73) were measured. Antibodies against HPV16/18 were higher after bivalent HPV vaccination (mean international units [IU] 1140.1 and 170.5 for HPV16 and 18, respectively) than after nonavalent vaccination (265.1 and 22.3 IUs, respectively). The bivalent vaccine commonly induced antibodies against the nonvaccine HPV types 31/33/35/45 or 58. The nonavalent vaccine induced higher antibodies against HPV6/11/31/33/45/52/58 and 35.

HPV Vaccination Coverage Rate in a Rural Area: An Observational, Retrospective, and Cohort Study

In order to reduce the incidence and mortality rate of cervical cancer, the World Health Organization (WHO) declared the Global Strategy Goal for 2030, advocating for reaching a vaccination coverage rate of >90% against human papillomavirus for girls by the age of 15 years. The main objectives of this study were (1) to determine the papillomavirus vaccination coverage among women 15−40 years old and (2) to identify the at-risk subgroups and possible barriers to achieving WHO’s 2030 goal. Multicentre, observational, retrospective, and community-based cohort studies were conducted on women from a rural area in southern Catalonia until 31 December 2021. A total of 23,136 women were included, with a mean age of 26.6 (SD = 5.6) years. The average dose number was 1.7 (SD = 0.7). The results showed overall vaccination coverage of 17.4% among the target women. This coverage was unequal across regions (16.6−24.5%, p < 0.001), primary healthcare teams (15.5−24.3%, p < 0.001), and age groups (56.7% (15−19-year-olds) vs. 3.8% (35−40-year-olds), p < 0.001), related to accessibility to vaccination and economic−geographical indicators. Clinical practice guidelines on screening individuals at risk in terms of vaccination access and public vaccination protocols should be implemented in order to improve the vaccination coverage rate.

Human papillomaviruses: diversity, infection and host interactions

Human papillomaviruses (HPVs) are an ancient and highly successful group of viruses that have co-evolved with their host to replicate in specific anatomical niches of the stratified epithelia. They replicate persistently in dividing cells, hijack key host cellular processes to manipulate the cellular environment and escape immune detection, and produce virions in terminally differentiated cells that are shed from the host. Some HPVs cause benign, proliferative lesions on the skin and mucosa, and others are associated with the development of cancer. However, most HPVs cause infections that are asymptomatic and inapparent unless the immune system becomes compromised. To date, the genomes of almost 450 distinct HPV types have been isolated and sequenced. In this Review, I explore the diversity, evolution, infectious cycle, host interactions and disease association of HPVs.