Effect of a vaccine information statement (VIS) on immunization status and parental knowledge, attitudes, and beliefs regarding infant immunization in Japan

A Review of Parental Vaccine Hesitancy for Human Papillomavirus in Japan

Globally, Japan has the lowest rate of vaccine confidence. The persistent parental vaccine hesitancy has been attributed to safety and efficacy concerns and is primarily driven by the negative experience with human papillomavirus (HPV) vaccines. This literature review aimed to identify factors associated with HPV vaccine uptake and potential strategies to reduce vaccine hesitancy among Japanese parents. Articles published in English or Japanese between January 1998 and October 2022 that examined Japanese parental factors for HPV vaccine uptake were identified from PubMed, Web of Science, and Ichushi-Web. In total, 17 articles met the inclusion criteria. Four key themes which affected HPV vaccine hesitancy and acceptance were identified: perceptions of risk and benefits, trust and recommendation, information and knowledge, and sociodemographic characteristics. While governmental and healthcare provider recommendations are important factors, efforts to improve parental confidence in the HPV vaccine are required. Future interventions to counteract HPV vaccine hesitancy should actively disseminate information on vaccine safety and effectiveness, along with information on the severity and susceptibility of HPV infection.

A favorable impression of vaccination leads to a better vaccination rate for the human papillomavirus vaccine: A Japanese questionnaire survey investigation

Background

The Japanese vaccination rate for infants and children is seemingly excellent, except for the human papillomavirus (HPV) vaccine. Regardless of its efficacy, the inoculation rate in Japan has dropped to approximately 1 % since 2013 because of negative information about vaccine side effects. We aimed to demonstrate the factors that lead to low vaccine acceptance rates (e.g., caregiver attitudes, popular misconceptions) to inform the relevant target demographic of a stronger intention to immunize and to facilitate recovery of HPV vaccine coverage.

Methods

We conducted this study using data from two questionnaire surveys. Statistical analyses of factors affecting vaccine impressions and mediation effects of HPV vaccine impressions were performed. The difference in the knowledge about each vaccine was evaluated.

Results

Of the respondents, 95.9 % reported their intent to vaccinate their infants, whereas 58.2-78.3 % felt that they sufficiently understood the aims, efficacy, and risks of vaccination and 66.6 % had a positive impression of vaccines. Overall, 21.3 % of parents responded that they planned to have their child vaccinated against HPV, and 25.8 % had a favorable impression of this vaccine. Among factors affecting vaccine impressions, we found that parents had anxiety about vaccines when they felt that their knowledge of vaccines was insufficient. Additionally, impressions of the HPV vaccine had a mediating effect on the association between the impressions of infant vaccines and parents' intent to provide the vaccine to their children.

Conclusion

These findings show that as a society, we need to improve impressions and knowledge regarding vaccines, including but not exclusively the HPV vaccine. Moreover, although the recovery of HPV vaccine coverage is strongly desired for improving public health, simply improving impressions about the HPV vaccine or educating parents with substantive knowledge is insufficient. Instead, improving impressions and understanding of the vaccination itself is necessary.

COVID-19 Vaccine Acceptance and its Predictors among College Students in Addis Ababa, Ethiopia, 2021: A Cross-Sectional Survey

BACKGROUND

The coronavirus disease pandemic disrupted the normal social and economic activities of the people resulting in over 3 million deaths worldwide. Piece of literature depicted that predictors of vaccine acceptance are complex, multiple, and vary depending on the type of vaccine involved.

OBJECTIVE

The study aimed at assessing the COVID-19 acceptance and its predictors among college students in Addis Ababa, Ethiopia, 2021.

METHODS

A multi-center-institutional-based cross-sectional study was conducted among 407 participants from three institutions in Addis Ababa selected based on a simple random sampling method from May 01 to July 30, 2021. A self-administered structured questionnaire was used for the collection of data, after which informed consent was obtained from all the included study participants. Descriptive statistics was used for the summarization of the data. Binary (bivariate and multivariate) logistic regression was applied for the identification predictors of vaccine acceptance with their respective 95% confidence interval and less than 5% p-value for the ascertainment of presence of association.

RESULTS

The level of vaccine acceptance was 39.8% (95% CI: 35.0-44.7%). Being male (AOR: 0.463, 95% CI: 0.284-0.755, P < 0.001), living with children under the age of five (AOR: 2.295; 95% CI: 1.416-3.721, P < 0.05), living with an elderly (AOR: 1.609, 95% CI: 1.016-2.548, P < 0.05) and having had poor knowledge (AOR: 2.187, 95% CI: 1.391-3.438, P < 0.001) were predictors significantly associated with an increased level of vaccine acceptance.

CONCLUSION AND RECOMMENDATION

The level of vaccine acceptance among college students in Ethiopia was lower than necessary to achieve herd immunity. Sex, living with under-five children, and elderly, and knowledge were predictors of COVID-19 acceptance. Concerned bodies were suggested to work over the identified predictors of vaccine acceptance in the study settings.

Changes and remaining challenges for the Japanese immunization program: Closing the vaccine gap

The Japanese immunization program has made considerable progress since 2009: several new vaccines have been introduced and most are included in the National Immunization Program (NIP). In October 2020, the Japanese law on immunization was revised, which resulted in a few laudable achievements. First, rotavirus vaccines were added to the NIP, 10 years after their introduction, and noteworthy studies of vaccine effectiveness and the incidence of intussusception in Japanese children were published. Second, rules on vaccine intervals-which had been a longstanding concern-were withdrawn. In addition to this revision of the law, the Japanese version of the Vaccine Information Statement (VIS) was released by the Japan Pediatric Society in 2018. The VIS provides useful caregiver information on general immunization concepts and individual vaccines. Further challenges for the Japanese immunization program include (1) administering a booster dose of pertussis-containing vaccine to preschool children or teenagers, (2) reestablishing the active recommendation for human papilloma virus vaccines, (3) adding the mumps and influenza vaccines to the NIP, and (4) ensuring optimal dosing of seasonal influenza vaccines. During the current coronavirus disease 2019 (COVID-19) pandemic, vaccination rates among children have been decreasing in many countries. In Japan, vaccination rates have been stable in infants, but declining among toddlers and school-aged children, despite public awareness of the need for timely administration of vaccines during the pandemic. Clearly, further action is needed if we are to adequately protect children living in Japan from vaccine-preventable diseases.