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Vaccination hesitation in children under five years of age: a scoping review

Vacunación vacuna en niños menores de cinco años: una revisión del alcance

ABSTRACT

Objectives:

to synthesize scientific evidence on vaccine hesitancy in children under five years of age and its associated factors.

Methods:

a scoping review, conducted according to the methodological structure proposed by the JBI. Searches were carried out in the Latin American and Caribbean Center on Health Sciences Information, Scientific Electronic Library Online and PubMed databases, including gray literature. Studies in English, Spanish and Portuguese were included, without temporal delimitation. Editorials, studies that did not address vaccine hesitancy in children under five years of age and were not aligned with the objective and research question were excluded. The sample consisted of 18 articles.

Results:

misinformation, concern about adverse effects, distrust about efficacy, affliction regarding administration simultaneously, and insecurity in relation to the laboratories were the reported reasons.

Conclusions:

strategies are needed to combat the lack of information about immunobiological agents, as misinformation was the main factor in parents’ vaccine hesitation.

Descriptors:
Vaccine Hesitation; Vaccination Coverage; Vaccination Refusal; Parents; Children

RESUMEN

Objetivos:

sintetizar la evidencia científica sobre la reticencia vacunal en menores de cinco años y sus factores asociados.

Métodos:

revisión de alcance, realizada según la estructura metodológica propuesta por el JBI. Las búsquedas se realizaron en el Centro Latinoamericano y del Caribe de Información en Ciencias de la Salud, Scientific Electronic Library Online y PubMed, incluida la literatura gris. Se incluyeron estudios en inglés, español y portugués, sin delimitación temporal. Se excluyeron editoriales, estudios que no abordaran la reticencia vacunal en menores de cinco años y que no estuvieran alineados con el objetivo y pregunta de investigación. La muestra estuvo compuesta por 18 artículos.

Resultados:

la desinformación, la preocupación por los efectos adversos, la desconfianza en la eficacia, la angustia por la administración simultánea y la inseguridad por los laboratorios fueron los motivos informados.

Conclusiones:

se necesitan estrategias para combatir la falta de información sobre inmunobiológicos, ya que la desinformación fue el principal factor en la duda vacunal de los padres.

Descriptores:
Vacilación a la Vacunación; Cobertura de Vacunación; Negativa a la Vacunación; Padres; Niños

RESUMO

Objetivos:

sintetizar evidências científicas sobre hesitação vacinal em crianças menores de cinco anos e seus fatores associados.

Métodos:

revisão de escopo, conduzida conforme a estrutura metodológica proposta pelo JBI. Realizaram-se buscas nas bases Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde, Scientific Electronic Library Online e PubMed, incluindo literatura cinzenta. Foram incluídos estudos em inglês, espanhol e português, sem delimitação, temporal. Foram excluídos editoriais, estudos que não abordaram hesitação vacinal em menores de cinco anos e não estiveram alinhadas com o objetivo e questão de pesquisa. A amostra foi composta por 18 artigos.

Resultados:

desinformação, preocupação com efeitos adversos, desconfiança sobre eficácia, aflição quanto à administração simultaneamente e insegurança em relação aos laboratórios foram os motivos relatados.

Conclusões:

são necessárias estratégias de combate à carência de informações acerca dos imunobiológicos, pois a desinformação foi o fator principal na hesitação vacinal dos pais.

Descritores:
Hesitação Vacinal; Cobertura Vacinal; Recusa de Vacinação; Pais; Crianças.

INTRODUCTION

Among the health promotion and protection strategies, disease prevention is one of the fundamental pillars of the Brazilian public health system, since preventing diseases from taking hold increases individuals’ and populations’ quality and life expectancy. Moreover, it generates considerable savings in terms of cost in the country’s public health, as it avoids expenses related to parents’ diagnosis, treatment and rehabilitation.

Thus, immunizing individuals through vaccination represents one of the most cost-effective primary prevention measures with a clear positive impact on collective health, reducing morbidity and mortality from infectious diseases, especially in children up to one year of age(11 World Health Organization (WHO). Global Vaccine Action Plan 2011-2020[Internet]. Geneva: WHO; 2013 [cited 2022 Oct 29]. Available from: https://www.who.int/publications/i/item/global-vaccine-action-plan-2011-2020
https://www.who.int/publications/i/item/...
).

The success of the Brazilian National Immunization Program (PNI - Programa Nacional de Imunizações), whose performance and scope are compared to those of developed countries, took place through vaccination actions that resulted in a decline in morbidity and mortality from communicable diseases in the country, the eradication of poliomyelitis in 1989 and rubella and measles elimination certifications, received in 2015 and 2016, respectively. However, the high vaccination coverage (VC) rates achieved by the PNI have fallen in recent years, resulting in the resurgence of vaccine-preventable diseases, such as measles(22 Fundação Oswaldo Cruz. Rubéola: Brasil recebeu da OMS o Certificado de Eliminação da doença [Internet]. Rio de Janeiro: 2015 [cited 2022 Oct 28]. Available from: https://portal.fiocruz.br/noticia/rubeola-brasil-recebeu-da-oms-o-certificado-de-eliminacao-da-doenca
https://portal.fiocruz.br/noticia/rubeol...

3 Fundação Oswaldo Cruz. Sarampo: eliminação da doença no Brasil é resultado de esforço de mais de duas décadas[Internet]. Rio de Janeiro: 2016 [cited 2022 Oct 28]. Available from: https://portal.fiocruz.br/noticia/sarampo-eliminacao-da-doenca-no-brasil-e-resultado-de-esforco-de-mais-de-duas-decadas
https://portal.fiocruz.br/noticia/saramp...

4 Sato APS. Qual a importância da hesitação vacinal na queda das coberturas vacinais no Brasil? Rev Saude Publica. 2018;52(96):1-9. https://doi.org/10.11606/S1518-8787.2018052001199
https://doi.org/10.11606/S1518-8787.2018...
-55 Nunes L. Instituto de Estudos para Políticas de Saúde. Panorama da Cobertura Vacinal no Brasil, 2020 [Internet]. São Paulo: 2021 [cited 2022 Oct 29]. Available from: https://download.uol.com.br/files/2021/09/6149375_metas-de-coberturas-vacinais.pdf
https://download.uol.com.br/files/2021/0...
).

The decline in the national VC was relevant between 2015 and 2019, since there was a significant drop in the percentages of VC: polio, MMR (first dose), BCG, pentavalent, hepatitis B (in children up to 30 days), hepatitis A, pneumococcal, meningococcal C and human rotavirus. In this context, 10,330 cases of measles were registered in 2018 and 20,901 in 2019, in different regions of the country, causing Brazil to lose, in 2019, the certificate of disease eradication. It is important to highlight that the COVID-19 pandemic contributed to the drop in VC during 2020(55 Nunes L. Instituto de Estudos para Políticas de Saúde. Panorama da Cobertura Vacinal no Brasil, 2020 [Internet]. São Paulo: 2021 [cited 2022 Oct 29]. Available from: https://download.uol.com.br/files/2021/09/6149375_metas-de-coberturas-vacinais.pdf
https://download.uol.com.br/files/2021/0...
-66 Sato APS. Pandemic and vaccine coverage:challenges of returning to schools. Rev Saude Publica. 2020;54(115):1-8. https://doi.org/10.11606/s1518-8787.2020054003142
https://doi.org/10.11606/s1518-8787.2020...
).

In addition to this, it is noteworthy that the decline in VC may be related, among other things, to the geographic location of health units in relation to users’ residence, social determinants, discontinuity of immunobiological agent supply, opening hours of vaccine rooms, and, above all, vaccine hesitancy (VH), defined as the delay in accepting or refusing recommended vaccines, despite their availability in health services(44 Sato APS. Qual a importância da hesitação vacinal na queda das coberturas vacinais no Brasil? Rev Saude Publica. 2018;52(96):1-9. https://doi.org/10.11606/S1518-8787.2018052001199
https://doi.org/10.11606/S1518-8787.2018...
). Such behavior has been influenced by cultural, social, religious and economic issues as well as by the lack of information and/or misinformation about aspects involving the immunization processes(44 Sato APS. Qual a importância da hesitação vacinal na queda das coberturas vacinais no Brasil? Rev Saude Publica. 2018;52(96):1-9. https://doi.org/10.11606/S1518-8787.2018052001199
https://doi.org/10.11606/S1518-8787.2018...
,77 Nobre R, Guerra LDS, Carnut L. Hesitação e recusa vacinal em países com sistemas universais de saúde: uma revisão integrativa sobre seus efeitos. Saude Debate. 2022;46(spe1):303-21. https://doi.org/10.1590/0103-11042022E121
https://doi.org/10.1590/0103-11042022E12...

8 Bonsu NEM, Mire SS, Sahni LC, Berry N, Dowell LR, Minard CG, et al. Understanding vaccine hesitancy among parents of children with autism spectrum disorder and parents of children with non-autism developmental delays. J Child Neurol. 2021;36(10): 911-18. https://doi.org/10.1177/08830738211000505
https://doi.org/10.1177/0883073821100050...

9 Braz RM, Domingues CMAS, Teixeira MAS, Luna EJA. Classification of transmission risk of vaccine-preventable diseases based on vaccination indicators in Brazilian municipalities. Epidemiol Serv Saude. 2016;25(4):745-54. https://doi.org/10.5123/S1679-49742016000400008
https://doi.org/10.5123/S1679-4974201600...
-1010 Arruda CAM, Bosi MLM. Satisfação de usuários da atenção primária à saúde: um estudo qualitativo no Nordeste do Brasil. Interface. 2017;21(61):321-32. https://doi.org/10.1590/1807-57622015.0479
https://doi.org/10.1590/1807-57622015.04...
).

In Brazil, although VH is a recognized and increasingly evident problem, few studies have been developed about VH and it is still not possible to effectively identify which factors are associated with individuals with this type of behavior(1111 Olive JK, Hotez PJ, Damania A, Nolan MS. The state of the antivaccine movement in the United States: a focused examination of nonmedical exemptions in states and counties. PLOS Medicine. 2018;15(6):e1002578. https://doi.org/10.1371/journal.pmed.1002578
https://doi.org/10.1371/journal.pmed.100...

12 Succi RCM. Vaccine refusal: what we need to know. J Pediatr. 2018;94(6):574-81. https://doi.org/10.1016/j.jped.2018.01.008
https://doi.org/10.1016/j.jped.2018.01.0...
-1313 Santos Júnior CJ, Costa PJMS. Adaptação transcultural e validação para o Português (Brasil) do Parent Attitudes About Childhood Vaccine (PACV). Cien Saude Colet. 2022;27(5):2057-70. https://doi.org/10.1590/1413-81232022275.11802021
https://doi.org/10.1590/1413-81232022275...
). Thus, this study helps to identify and understand the factors that corroborate VH among fathers, mothers or guardians of children under five years of age, providing indispensable information for the planning of nursing actions, especially those developed in Primary Health Care, which strengthen VC in the child population.

OBJECTIVES

To synthesize available scientific evidence on VH in children under five years of age and its associated factors.

METHODS

Ethical aspects

Since it is research that used public domain data, it was not necessary to submit the review for appreciation by the Research Ethics Committee (REC).

Study design, period and place

This is a scoping review whose objective is to synthesize the findings of scientific research, about a certain research problem, without analyzing the methodological quality of included studies. It was developed based on the methodological framework proposed by the JBI(1414 Peters MDJ, Marnie C, Tricco AC, Pollock D, Munn A, Alexander L, et al. Updated methodological guidance for the conduct of scoping reviews. JBI Evid Synth. 2020;18(10):2119-26. https://doi.org/10.11124/JBIES-20-00167
https://doi.org/10.11124/JBIES-20-00167...
), following the Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) Checklist(1515 Tricco AC, Lillie E, Zarin W, O'Brien KK, Colquhoun H, Levac D, et al. PRISMA extension for scoping reviews (PRISMA-ScR): checklist and explanation. Ann Intern Med. 2018,169(7):467-73. https://doi.org/10.7326/M18-0850
https://doi.org/10.7326/M18-0850...
). This review had its protocol registered on the Open Science Framework (OSF) platform and can be accessed at https://osf.io/nzyqp/.

As proposed by the JBI, the following steps were followed: define and align the objective and questions; develop and align inclusion criteria with objective and questions; describe the planned approach to evidence search, selection, data extraction and evidence presentation; search, select, extract and analyze evidence; present the results; summarize the evidence against the purpose of the review by drawing conclusions; and observe the implications of the findings(1414 Peters MDJ, Marnie C, Tricco AC, Pollock D, Munn A, Alexander L, et al. Updated methodological guidance for the conduct of scoping reviews. JBI Evid Synth. 2020;18(10):2119-26. https://doi.org/10.11124/JBIES-20-00167
https://doi.org/10.11124/JBIES-20-00167...
).

To elaborate the research question, the mnemonic PCC (Participant, Concept and Context) was used. Participants are fathers, mothers or guardians of children under five years of age; concept is VH including associated factors; and context is childhood vaccination. In this regard, the question of this scoping review was: what is the available evidence on vaccine hesitancy in children under five years of age and its associated factors?

The bibliographic survey was carried out between May and June 2022, in the following databases and bibliographic index: Latin American and Caribbean Center on Health Sciences Information (BIREME); Scientific Electronic Library Online (SciELO); and PubMed. As for gray literature, it was searched in the Coordination for the Improvement of Higher Education Personnel (CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) Theses and Dissertations Catalog and Google Scholar. The search strategy in the databases was conducted from Health Sciences Descriptors (DeCS)/Medical Subject Headings (MeSH), which were combined using Boolean operators AND and OR. In each database, three separate searches were performed, as described in Chart 1.

Chart 1
Search syntax of articles in data sources, Teresina, Piaui, Brazil, 2022

Cross-sectional studies, randomized clinical trials and systematic reviews, published online in full, without time restriction, in Portuguese, English and Spanish were included. Editorials, publications that did not address VH in children under five years of age, and publications that were not aligned with the objective or addressed the research question were excluded.

The search was carried out by two independent reviewers, simultaneously, who carried out the initial screening, based on the screening of titles and, later, reading the abstracts using the eligibility criteria as a guide, and all identified references were imported into a reference management software, Zotero 6(1616 Zotero. Zotero 6 for windows. Your personal research assistant [Internet]. 2022 [cited 2022 May 04]. Available from: https://www.zotero.org/
https://www.zotero.org/...
), for selecting, organizing and archiving articles. All duplicate articles were counted only once. Differences regarding the inclusion of a study were discussed and resolved between the reviewers. Ties were resolved by a third reviewer who, after reading the entire material, broke the tie to compose the final sample.

Data were collected using a data mapping form, created in Microsoft Word and based on the manual provided by JBI(1717 Peters MDJ, Godfrey C, McInerney P, Munn Z, Tricco AC, Khalil, H. Chapter 11: Scoping Reviews (2020 version). In: Aromataris E, Munn Z (Editors). JBI Manual for Evidence Synthesis. JBI; 2020. https://doi.org/10.46658/JBIMES-20-12
https://doi.org/10.46658/JBIMES-20-12...
). The form was initially tested by two independent reviewers using a random sample of 10% of included studies to ensure consistency and accuracy. Data extraction from eligible documents was performed independently by two reviewers. Data analysis was conducted to identify themes and subthemes, which were grouped, summarized and presented as a narrative.

The classification of the scientific evidence of the articles that composed the sample was based on the levels of evidence established by the JBI(1818 Joanna Briggs Institute. JBI levels of evidence, October 2013 [Internet]. 2014[cited 2022 May 09]. Available from: http://joannabriggs.org/assets/docs/approach/JBI-Levels-of-evidence_2014.pdf
http://joannabriggs.org/assets/docs/appr...
).

RESULTS

The entire study selection process was mapped according to the PRISMA(1919 PRISMA. Transparent Reporting of Systematic Reviews and Meta-Analyses. PRISMA Flow Diagram [Internet]. 2020 [cited 2022 May 04]. Available from: https://prisma-statement.org/PRISMAStatement/FlowDiagram
https://prisma-statement.org/PRISMAState...
) flowchart (Figure 1). Initially, 13,773 publications were identified, distributed in the BIREME (n=3,910), SciELO (n= 47), PubMed (n=3,782), Google Scholar (n=6,029) and CTD-CAPES (n=05) databases, excluding those who presented repeated (n=15). Then, editorials (n=06) were excluded as well as studies that did not address VH in children under five years of age, by reading the titles (n=12,722) and abstracts (n=984), 46 selected articles remaining. Of these, 27 were excluded, as they did not treat VH in children under five years of age and one preprint, since it did not show results. In the end, the sample consisted of 18 articles.

Figure 1
PRISMA flow diagram, Teresina, Piaui, Brazil, 2022

The sample consisted of articles published in 2017 (03), 2018 (02), 2019 (05), 2020 (02), 2021 (03) and 2022 (03). There was no prevalence regarding the country in which the studies were carried out, since the sample was uniformly distributed among 13 countries. Regarding the study design, cross-sectional studies prevailed (14), classified at level 4.b of evidence (Chart 2).

Chart 2
Characterization of studies included in the review, Teresina, Piaui, Brazil, 2022

Cross-sectional studies were intended, in summary, to investigate the prevalence and determinants of VH in parents of children under five years of age. With the exception of the reviews (S9 and S12), the survey samples were made up of children’s parents or guardians (Chart 3).

Chart 3
Description of studies according to objective, population and sample, Teresina, Piaui, Brazil, 2022

The analysis of the most relevant results found in the studies allowed identifying the main determinants of VH. These were synthesized and distributed into four categories: (1) Misinformation and fake news; (2) Adverse effects; (3) Vaccine efficacy and safety; and (4) Religious Beliefs. The distribution of studies, according to the content presented in the results, and their respective categories, is described in Chart 4.

Chart 4
Categorization of results found in studies, Teresina, Piaui, Brazil, 2022

Misinformation and fake news

This category was present in 15 studies (S1, S2, S5, S6, S7, S8, S9, S10, S11, S12, S14, S15, S16, S17 and S18). It was noticed that hesitant parents had characteristics alluding to lack of information and/or misinformation (here understood as having divergent information about immunobiological agents). Many have demonstrated belief in conspiracy theories; concern with the number of vaccines intended for the child population; belief that illnesses are not so dangerous; general questions about the vaccination schedule and vaccines; exposure to negative media information; lack of clarity in the information provided by the government, health professionals and health institutions; and doubts regarding sources of reliable information on immunobiological agents.

Adverse effects

Concern about possible serious adverse effects was present in 11 studies (S1, S2, S4, S7, S9, S10, S11, S12, S13, S14 and S15). Studies revealed that hesitant parents/guardians reported having high concern related to reactions such as fever, allergies, disabilities, autism, paralysis, seizures and even death.

Vaccine safety and efficacy

In 12 of the analyzed studies (S1, S2, S4, S6, S7, S9, S10, S11, S12, S14, S17 and S18) concern/distrust about vaccine efficacy and safety was mentioned by participants. Some of them showed concern about the safety of administering vaccines to children. Furthermore, the application of two or more vaccines, administered at the same time in different anatomical regions and routes of administration, is another factor that causes extreme distress among parents. There are also those who said they did not believe in the effectiveness of vaccines and also showed insecurity in relation to the laboratories that manufacture immunizers.

Religious beliefs

In five studies (S3, S9, S10, S17 and S18), evidence was found about the religious influence on the behavior of hesitant parents. Children of Islamic parents were not vaccinated due to the belief that pork-derived products are part of the composition of immunobiological agents. In other cases, some parents stated that exposing children to diseases would build immunity, since diseases are natural and that, therefore, “God would decide whether the child would be sick or not”. Added to this, there is the fact that some parents reported believing more in alternative medicine than in immunization through vaccines.

DISCUSSION

Although this review carried out a synthesis and categorization of the results related to the causes of VH, the reasons that lead parents to postpone or refuse their children’s vaccination are multiple and complex. However, the reasons have been presented in a dissociated way in the present work, it is essential to remember that, when it comes to hesitant parents, the reasons that determine VH can also be correlated.

The lack of pertinent and adequate information causes people to seek help in the media, especially on the internet. This behavior triggers a series of disorders due to the flood of available information, whether true or not. Although social media are undisputed means of mass communication, they have also been a huge source of untrue information and, consequently, harmful to public health(3838 Frugoli AG, Prado RS, Silva TMR, Matozinhos FP, Trapé CA, Lachtim SAF. Vaccine fake news: an analysis under the World Health Organization’s 3Cs model. Rev Esc Enferm USP. 2021;55:e03736. https://doi.org/10.1590/S1980-220X2020028303736
https://doi.org/10.1590/S1980-220X202002...
).

Fake news about vaccines gained greater notoriety during the advent of the COVID-19 pandemic. With social isolation required by health authorities, people have become hyperconnected to social media most of the time, virtual environments in which most people still do not know how to differentiate between false and true news. Therefore, the problem revolves around the questionable quality of the contents accessed(2626 Bianco A, Mascaro V, Zucco R, Pavia M. Parent perspectives on childhood vaccination: how to deal with vaccine hesitancy and refusal?. Vaccine. 2019;37:984-90. https://doi.org/10.1016/j.vaccine.2018.12.062
https://doi.org/10.1016/j.vaccine.2018.1...
,3939 Galhardi CP, Freire NP, Fagundes MCM, Minayo MCS, Cunha ICKO. Fake News and vaccine hesitancy in the COVID-19 pandemic in Brazil. Cienc Saude Coletiva. 2022;27(5):1849-58. https://doi.org/10.1590/1413-81232022275.24092021EN
https://doi.org/10.1590/1413-81232022275...
-4040 Massarani L, Waltz I, Leal T, Modesto M. Narratives about vaccination in the age of fake news: a content analysis on social networks. Saude Soc. 2021;30(2):e200317. https://doi.org/10.1590/S0104-12902021200317
https://doi.org/10.1590/S0104-1290202120...
).

The difficulty in dealing with the ambiguity of available information was reported in a systematic review and meta-synthesis, with articles published until 2018. The study revealed that hesitant parents stated that there was no objective information about vaccines, since the available information is often unreliable, due to the fact that it is fragmented, contradictory and biased(4141 Crescitelli MED, Ghirotto L, Sisson H, Sarli L, Artioli G, Bassi MC, et al. A meta-synthesis study of the key elements involved in childhood vaccine hesitancy. Public Health. 2020;180:38-45. https://doi.org/10.1016/j.puhe.2019.10.027
https://doi.org/10.1016/j.puhe.2019.10.0...
).

Health professionals play an important role in the fight against VH, as long as they adopt postures and speeches that aim to positively influence the population’s behavior. It is recognized that its recommendations, when shared clearly and in language accessible to the most varied social classes, awakens confidence in vaccines in users(4242 Costa P, Meneses NFA, Carmo CJ, Solís-Cordero K, Palombo CNT. Vaccination completion and delay in children before and after an educational intervention with their families. Cogitare Enferm. 2020;25:e67497. https://doi.org/10.5380/ce.v25i0.67497
https://doi.org/10.5380/ce.v25i0.67497...
).

In this same context of mistrust, part of the parents justifies VH based on mistaken reports that cause concern about the possible serious adverse effects caused by immunobiological agent administration. It is important to highlight that, similarly to any treatment, vaccines can trigger serious complications, such as severe allergic reactions, even though they are not frequent. However, some of the adverse effects such as autism, infertility and disabilities associated with the immunization process have already been refuted by science(3232 Alqahtani YA, Almutairi KH, Alqahtani YM, Almutlaq AH, Asiri AA. Prevalence and Determinants of Vaccine Hesitancy in Aseer Region, Saudi Arabia. Clin Basic Res. 2021;21(4):532-38. https://doi.org/10.18295/squmj.4.2021.023
https://doi.org/10.18295/squmj.4.2021.02...
,4343 Camargo Júnior KR. Here we go again: the reemergence of anti-vaccine activism on the Internet. Cad Saude Publica. 2020;36(supp 2):e00037620. https://doi.org/10.1590/0102-311X00037620
https://doi.org/10.1590/0102-311X0003762...
-4444 Taylor LE, Swerdfeger AL, Eslick GD. Vaccines are not associated with autism: an evidence-based meta-analysis of case-control and cohort studies. Vaccine. 2014;32(29):3623-9. https://doi.org/10.1016/j.vaccine.2014.04.085
https://doi.org/10.1016/j.vaccine.2014.0...
).

Hesitant parents harbor concerns about vaccine safety, as surveys show that 40-52% of parents had concerns about vaccinating their children(4545 Dubé E, Gagnon D, Ouakki M, Bettinger JA, Guay M, Halperin S, et al. Understanding vaccine hesitancy in Canada: results of a consultation study by the Canadian immunization research network. PLOs One. 2016;11(6):e0156118. https://doi.org/10.1371/journal.pone.0156118
https://doi.org/10.1371/journal.pone.015...
-4646 My C, Danchin M, Willaby HW, Pemberton S, Leask J. Parental attitudes, beliefs, behaviours and concerns towards childhood vaccinations in Australia: a national online survey. Aust Fam Physician [Internet]. 2017 [cited 2022 Oct 28];46(3):145-51. Available from: https://pubmed.ncbi.nlm.nih.gov/28260278/
https://pubmed.ncbi.nlm.nih.gov/28260278...
). The belief in the ineffectiveness or safety of vaccines is also associated with the belief that immunobiological agents are nothing more than a product that pharmaceutical industries use exclusively to profit(2626 Bianco A, Mascaro V, Zucco R, Pavia M. Parent perspectives on childhood vaccination: how to deal with vaccine hesitancy and refusal?. Vaccine. 2019;37:984-90. https://doi.org/10.1016/j.vaccine.2018.12.062
https://doi.org/10.1016/j.vaccine.2018.1...
). This association can make people believe that vaccines are not made up of compounds capable of stimulating the immune system, since, according to the belief, they would be a type of placebo.

Allied to this, there is the fact that many individuals agree that the number of vaccines administered to children is very high. Although the number of vaccines given to children has increased significantly over the past decade, scientific evidence clearly states that there is no upper limit to the number of vaccines that can be given simultaneously(3333 Chung-Delgado K, Venero JEV, Vu TM. Vaccine Hesitancy: Characteristics of the Refusal of Childhood Vaccination in a Peruvian Population. Cureus. 2021;13(3):e14105. https://doi.org/10.7759/cureus.14105
https://doi.org/10.7759/cureus.14105...
).

According to the report “Adverse events Associated with childhood vaccines”, one of the Institute of Medicine of the United States, children are exposed to many foreign antigens every day when eating food. Furthermore, numerous bacteria live in the mouth and nose, exposing the immune system to even more antigens. Given these normal events, it seems unlikely that the number of antigens contained in childhood vaccines pose a risk to the immune system(4747 World Health Organization (WHO). Vaccines and immunization: myths and misconceptions[Internet]. 2020 [cited 2022 Jul 01]. Available from: https://www.who.int/news-room/questions-and-answers/item/vaccines-and-immunization-myths-and-misconceptions
https://www.who.int/news-room/questions-...
).

Religiosity and beliefs in alternative therapies that lead to VH are a major obstacle for health authorities that seek to increase childhood vaccination rates, given the difficulty of reversing such opinions/behaviors(4848 Mckee C, Bohannon K. Exploring the reasons behind parental refusal of vaccines. J Pediatr Pharmacol Ther. 2016;21(2):104-9. https://doi.org/10.5863/1551-6776-21.2.104
https://doi.org/10.5863/1551-6776-21.2.1...
). A study of Islamic parents revealed that children were not given any vaccines as their parents believed they contained pork products, and as Muslims are prohibited from eating pork, children were not vaccinated, because vaccines would be able to destroy the healthy cells of their children, due to the presence of porcine substance(2929 Syiroj ATR, Pardosi JF, Heywood AE. Exploring parents’ reasons for incomplete childhood immunisation in Indonesia. Vaccine. 2019;37(43):6486-93. https://doi.org/10.1016/j.vaccine.2019.08.081
https://doi.org/10.1016/j.vaccine.2019.0...
).

Allied to religious issues is the fact that some hesitant parents believe that vaccines represent an ‘unnatural’ approach to health, interfering with the body’s ability to naturally protect itself against disease, using the example that in times when vaccines did not exist, people were naturally healthy(2929 Syiroj ATR, Pardosi JF, Heywood AE. Exploring parents’ reasons for incomplete childhood immunisation in Indonesia. Vaccine. 2019;37(43):6486-93. https://doi.org/10.1016/j.vaccine.2019.08.081
https://doi.org/10.1016/j.vaccine.2019.0...
,4141 Crescitelli MED, Ghirotto L, Sisson H, Sarli L, Artioli G, Bassi MC, et al. A meta-synthesis study of the key elements involved in childhood vaccine hesitancy. Public Health. 2020;180:38-45. https://doi.org/10.1016/j.puhe.2019.10.027
https://doi.org/10.1016/j.puhe.2019.10.0...
). It would be interesting for these parents to remember that diseases such as smallpox, polio and Spanish flu existed in the past and that they were only eradicated after the advent of vaccination.

Study limitations

As a limitation, mention is made of the lack of national studies on the subject, which impairs the comparison with other realities as well as hinders a more accurate visualization of VH in the current Brazilian scenario. In this context, it is pertinent to carry out new studies at the national level. Moreover, it is important to highlight the scarcity of studies with a high level of evidence in the sample, since there was a prevalence of cross-sectional studies.

Contributions to nursing

The results, in addition to adding knowledge to the subject, provide important information about the causes of VH, to those health professionals who work with vaccination in general. In this regard, nursing professionals, specifically primary health care nurses, for being directly and permanently involved with the immunization process, will find subsidies to guide the creation of strategies aimed at minimizing VH, such as permanent health education, production of applications for smartphones, folders, booklets, etc., with a view to clarifying/informing the population about immunobiological agents, consolidating the relevance of nursing in maintaining public health quality.

CONCLUSIONS

Hesitant parents’ behavior regarding VH is determined by a complex of factors. This review synthesized the most relevant results of analyzed studies, making clear the need to develop tools with the potential to combat, in particular, the lack of information about immunobiological agents, since misinformation, characterized as the absence or misunderstanding of available information, concerns related to adverse reactions and safety in vaccine administration, and religious influence, were identified as the main factors in the VH of parents of children under five years of age. In an era marked by easy access to information and access to the means of communication, it is extremely important to create tools that provide accurate, logical, organized information in accessible language to the population.

AVAILABILITY OF DATA AND MATERIAL

https://doi.org/10.48331/scielodata.GV2AAB

REFERENCES

  • 1
    World Health Organization (WHO). Global Vaccine Action Plan 2011-2020[Internet]. Geneva: WHO; 2013 [cited 2022 Oct 29]. Available from: https://www.who.int/publications/i/item/global-vaccine-action-plan-2011-2020
    » https://www.who.int/publications/i/item/global-vaccine-action-plan-2011-2020
  • 2
    Fundação Oswaldo Cruz. Rubéola: Brasil recebeu da OMS o Certificado de Eliminação da doença [Internet]. Rio de Janeiro: 2015 [cited 2022 Oct 28]. Available from: https://portal.fiocruz.br/noticia/rubeola-brasil-recebeu-da-oms-o-certificado-de-eliminacao-da-doenca
    » https://portal.fiocruz.br/noticia/rubeola-brasil-recebeu-da-oms-o-certificado-de-eliminacao-da-doenca
  • 3
    Fundação Oswaldo Cruz. Sarampo: eliminação da doença no Brasil é resultado de esforço de mais de duas décadas[Internet]. Rio de Janeiro: 2016 [cited 2022 Oct 28]. Available from: https://portal.fiocruz.br/noticia/sarampo-eliminacao-da-doenca-no-brasil-e-resultado-de-esforco-de-mais-de-duas-decadas
    » https://portal.fiocruz.br/noticia/sarampo-eliminacao-da-doenca-no-brasil-e-resultado-de-esforco-de-mais-de-duas-decadas
  • 4
    Sato APS. Qual a importância da hesitação vacinal na queda das coberturas vacinais no Brasil? Rev Saude Publica. 2018;52(96):1-9. https://doi.org/10.11606/S1518-8787.2018052001199
    » https://doi.org/10.11606/S1518-8787.2018052001199
  • 5
    Nunes L. Instituto de Estudos para Políticas de Saúde. Panorama da Cobertura Vacinal no Brasil, 2020 [Internet]. São Paulo: 2021 [cited 2022 Oct 29]. Available from: https://download.uol.com.br/files/2021/09/6149375_metas-de-coberturas-vacinais.pdf
    » https://download.uol.com.br/files/2021/09/6149375_metas-de-coberturas-vacinais.pdf
  • 6
    Sato APS. Pandemic and vaccine coverage:challenges of returning to schools. Rev Saude Publica. 2020;54(115):1-8. https://doi.org/10.11606/s1518-8787.2020054003142
    » https://doi.org/10.11606/s1518-8787.2020054003142
  • 7
    Nobre R, Guerra LDS, Carnut L. Hesitação e recusa vacinal em países com sistemas universais de saúde: uma revisão integrativa sobre seus efeitos. Saude Debate. 2022;46(spe1):303-21. https://doi.org/10.1590/0103-11042022E121
    » https://doi.org/10.1590/0103-11042022E121
  • 8
    Bonsu NEM, Mire SS, Sahni LC, Berry N, Dowell LR, Minard CG, et al. Understanding vaccine hesitancy among parents of children with autism spectrum disorder and parents of children with non-autism developmental delays. J Child Neurol. 2021;36(10): 911-18. https://doi.org/10.1177/08830738211000505
    » https://doi.org/10.1177/08830738211000505
  • 9
    Braz RM, Domingues CMAS, Teixeira MAS, Luna EJA. Classification of transmission risk of vaccine-preventable diseases based on vaccination indicators in Brazilian municipalities. Epidemiol Serv Saude. 2016;25(4):745-54. https://doi.org/10.5123/S1679-49742016000400008
    » https://doi.org/10.5123/S1679-49742016000400008
  • 10
    Arruda CAM, Bosi MLM. Satisfação de usuários da atenção primária à saúde: um estudo qualitativo no Nordeste do Brasil. Interface. 2017;21(61):321-32. https://doi.org/10.1590/1807-57622015.0479
    » https://doi.org/10.1590/1807-57622015.0479
  • 11
    Olive JK, Hotez PJ, Damania A, Nolan MS. The state of the antivaccine movement in the United States: a focused examination of nonmedical exemptions in states and counties. PLOS Medicine. 2018;15(6):e1002578. https://doi.org/10.1371/journal.pmed.1002578
    » https://doi.org/10.1371/journal.pmed.1002578
  • 12
    Succi RCM. Vaccine refusal: what we need to know. J Pediatr. 2018;94(6):574-81. https://doi.org/10.1016/j.jped.2018.01.008
    » https://doi.org/10.1016/j.jped.2018.01.008
  • 13
    Santos Júnior CJ, Costa PJMS. Adaptação transcultural e validação para o Português (Brasil) do Parent Attitudes About Childhood Vaccine (PACV). Cien Saude Colet. 2022;27(5):2057-70. https://doi.org/10.1590/1413-81232022275.11802021
    » https://doi.org/10.1590/1413-81232022275.11802021
  • 14
    Peters MDJ, Marnie C, Tricco AC, Pollock D, Munn A, Alexander L, et al. Updated methodological guidance for the conduct of scoping reviews. JBI Evid Synth. 2020;18(10):2119-26. https://doi.org/10.11124/JBIES-20-00167
    » https://doi.org/10.11124/JBIES-20-00167
  • 15
    Tricco AC, Lillie E, Zarin W, O'Brien KK, Colquhoun H, Levac D, et al. PRISMA extension for scoping reviews (PRISMA-ScR): checklist and explanation. Ann Intern Med. 2018,169(7):467-73. https://doi.org/10.7326/M18-0850
    » https://doi.org/10.7326/M18-0850
  • 16
    Zotero. Zotero 6 for windows. Your personal research assistant [Internet]. 2022 [cited 2022 May 04]. Available from: https://www.zotero.org/
    » https://www.zotero.org/
  • 17
    Peters MDJ, Godfrey C, McInerney P, Munn Z, Tricco AC, Khalil, H. Chapter 11: Scoping Reviews (2020 version). In: Aromataris E, Munn Z (Editors). JBI Manual for Evidence Synthesis. JBI; 2020. https://doi.org/10.46658/JBIMES-20-12
    » https://doi.org/10.46658/JBIMES-20-12
  • 18
    Joanna Briggs Institute. JBI levels of evidence, October 2013 [Internet]. 2014[cited 2022 May 09]. Available from: http://joannabriggs.org/assets/docs/approach/JBI-Levels-of-evidence_2014.pdf
    » http://joannabriggs.org/assets/docs/approach/JBI-Levels-of-evidence_2014.pdf
  • 19
    PRISMA. Transparent Reporting of Systematic Reviews and Meta-Analyses. PRISMA Flow Diagram [Internet]. 2020 [cited 2022 May 04]. Available from: https://prisma-statement.org/PRISMAStatement/FlowDiagram
    » https://prisma-statement.org/PRISMAStatement/FlowDiagram
  • 20
    Azizi FSM, Kew Y, Moy FM. Vaccine hesitancy among parents in a multi-ethnic country, Malaysia. Vaccine. 2017;35(22):2955-61. https://doi.org/10.1016/j.vaccine.2017.04.010
    » https://doi.org/10.1016/j.vaccine.2017.04.010
  • 21
    Longitudinal Trends in Vaccine Hesitancy in a Cohort of Mothers Surveyed in Washington State, 2013-2015. Public Health Rep. 2017;132(4):451-4. https://doi.org/10.1177/0033354917711175
    » https://doi.org/10.1177/0033354917711175
  • 22
    Repalust A, Šević S, Rihtar S, Štulhofer A. Childhood vaccine refusal and hesitancy intentions in Croatia: insights from a population-based study. Psychol Health Med. 2017;22(9):1045-55. https://doi.org/10.1080/13548506.2016.1263756
    » https://doi.org/10.1080/13548506.2016.1263756
  • 23
    Brown AL, Sperandio M, Turssi CP, Leite RMA, Berton VF, Succi RM, et al. Vaccine confidence and hesitancy in Brazil. Cad Saude Publica. 2018;34(9):e00011618. https://doi.org/10.1590/0102-311X00011618
    » https://doi.org/10.1590/0102-311X00011618
  • 24
    Hu Y, Chen Y, Wang Y, Liang H. Measuring childhood vaccination acceptance of mother in Zhejiang province, East China. Hum Vaccin Immunother. 2019;15(2):287-94. https://doi.org/10.1080/21645515.2018.1526557
    » https://doi.org/10.1080/21645515.2018.1526557
  • 25
    Alsubaie SS, Gosadi IM, Alsaadi BM, Albacker NB, Bawazir MA, Bin-Daud N, et al. Vaccine hesitancy among Saudi parents and its determinants. Saudi Med J. 2019;40(12):1242-50. https://doi.org/10.15537/smj.2019.12.24653
    » https://doi.org/10.15537/smj.2019.12.24653
  • 26
    Bianco A, Mascaro V, Zucco R, Pavia M. Parent perspectives on childhood vaccination: how to deal with vaccine hesitancy and refusal?. Vaccine. 2019;37:984-90. https://doi.org/10.1016/j.vaccine.2018.12.062
    » https://doi.org/10.1016/j.vaccine.2018.12.062
  • 27
    Chang K, Lee SY. Why do some Korean parents hesitate to vaccinate their children?. Epidemiol Health. 2019;41:e2019031. https://doi.org/10.4178/epih.e2019031
    » https://doi.org/10.4178/epih.e2019031
  • 28
    Díaz Crescitelli ME, Ghirotto L, Sisson H, Sarli L, Artioli G, Bassi MC, et al. A meta-synthesis study of the key elements involved in childhood vaccine hesitancy. Public Health. 2020;180:38-45. https://doi.org/10.1016/j.puhe.2019.10.027
    » https://doi.org/10.1016/j.puhe.2019.10.027
  • 29
    Syiroj ATR, Pardosi JF, Heywood AE. Exploring parents’ reasons for incomplete childhood immunisation in Indonesia. Vaccine. 2019;37(43):6486-93. https://doi.org/10.1016/j.vaccine.2019.08.081
    » https://doi.org/10.1016/j.vaccine.2019.08.081
  • 30
    Migriño Junior J, Gayados B, Birol KRJ, De Jesus L, Lopez CW, Mercado WC, et al. Factors affecting vaccine hesitancy among families with children 2 years old and younger in two urban communities in Manila, Philippines. Western Pac Surveill Response J. 2020;11(2):20-6. https://doi.org/10.5365/wpsar.2019.10.2.006
    » https://doi.org/10.5365/wpsar.2019.10.2.006
  • 31
    Olson O, Berry C, Kumar N. Addressing parental vaccine hesitancy towards childhood vaccines in the united states: a systematic literature review of communication interventions and strategies. Vaccines. 2020;8(4);1-25. https://doi.org/10.3390/vaccines8040590
    » https://doi.org/10.3390/vaccines8040590
  • 32
    Alqahtani YA, Almutairi KH, Alqahtani YM, Almutlaq AH, Asiri AA. Prevalence and Determinants of Vaccine Hesitancy in Aseer Region, Saudi Arabia. Clin Basic Res. 2021;21(4):532-38. https://doi.org/10.18295/squmj.4.2021.023
    » https://doi.org/10.18295/squmj.4.2021.023
  • 33
    Chung-Delgado K, Venero JEV, Vu TM. Vaccine Hesitancy: Characteristics of the Refusal of Childhood Vaccination in a Peruvian Population. Cureus. 2021;13(3):e14105. https://doi.org/10.7759/cureus.14105
    » https://doi.org/10.7759/cureus.14105
  • 34
    Thapar R, Kumar N, Surendran P, Shahdiya A, Mahendran V, Ramesh R, et al. Vaccine hesitancy among mothers of under-five children in Coastal South India: a facility-based crosssectional study. F1000Research. 2021;10:1-18. https://doi.org/10.12688/f1000research.28293.3
    » https://doi.org/10.12688/f1000research.28293.3
  • 35
    Dasgupta P, Bhattacherjee S, Mukherjee A, Dasgupta S. Vaccine Hesitancy for Childhood Vaccinations in Slum Areas of Siliguri, India. Indian J Public Health. 2018;62:253-8. https://doi.org/10.4103/ijph.IJPH_397_17
    » https://doi.org/10.4103/ijph.IJPH_397_17
  • 36
    Çelik K, Turan S, Üner S. I’m a mother, therefore I question”: Parents’ legitimation sources of and hesitancy towards early childhood vaccination. Soc Sci Med. 2021;282:114132. https://doi.org/10.1016/j.socscimed.2021.114132
    » https://doi.org/10.1016/j.socscimed.2021.114132
  • 37
    Ilter H, Demir LS. Opinions of parents concerning childhood vaccine refusal. Gulhane Med J. 2021;63:96-103. https://doi.org/10.4274/gulhane.galenos.2020.1312
    » https://doi.org/10.4274/gulhane.galenos.2020.1312
  • 38
    Frugoli AG, Prado RS, Silva TMR, Matozinhos FP, Trapé CA, Lachtim SAF. Vaccine fake news: an analysis under the World Health Organization’s 3Cs model. Rev Esc Enferm USP. 2021;55:e03736. https://doi.org/10.1590/S1980-220X2020028303736
    » https://doi.org/10.1590/S1980-220X2020028303736
  • 39
    Galhardi CP, Freire NP, Fagundes MCM, Minayo MCS, Cunha ICKO. Fake News and vaccine hesitancy in the COVID-19 pandemic in Brazil. Cienc Saude Coletiva. 2022;27(5):1849-58. https://doi.org/10.1590/1413-81232022275.24092021EN
    » https://doi.org/10.1590/1413-81232022275.24092021EN
  • 40
    Massarani L, Waltz I, Leal T, Modesto M. Narratives about vaccination in the age of fake news: a content analysis on social networks. Saude Soc. 2021;30(2):e200317. https://doi.org/10.1590/S0104-12902021200317
    » https://doi.org/10.1590/S0104-12902021200317
  • 41
    Crescitelli MED, Ghirotto L, Sisson H, Sarli L, Artioli G, Bassi MC, et al. A meta-synthesis study of the key elements involved in childhood vaccine hesitancy. Public Health. 2020;180:38-45. https://doi.org/10.1016/j.puhe.2019.10.027
    » https://doi.org/10.1016/j.puhe.2019.10.027
  • 42
    Costa P, Meneses NFA, Carmo CJ, Solís-Cordero K, Palombo CNT. Vaccination completion and delay in children before and after an educational intervention with their families. Cogitare Enferm. 2020;25:e67497. https://doi.org/10.5380/ce.v25i0.67497
    » https://doi.org/10.5380/ce.v25i0.67497
  • 43
    Camargo Júnior KR. Here we go again: the reemergence of anti-vaccine activism on the Internet. Cad Saude Publica. 2020;36(supp 2):e00037620. https://doi.org/10.1590/0102-311X00037620
    » https://doi.org/10.1590/0102-311X00037620
  • 44
    Taylor LE, Swerdfeger AL, Eslick GD. Vaccines are not associated with autism: an evidence-based meta-analysis of case-control and cohort studies. Vaccine. 2014;32(29):3623-9. https://doi.org/10.1016/j.vaccine.2014.04.085
    » https://doi.org/10.1016/j.vaccine.2014.04.085
  • 45
    Dubé E, Gagnon D, Ouakki M, Bettinger JA, Guay M, Halperin S, et al. Understanding vaccine hesitancy in Canada: results of a consultation study by the Canadian immunization research network. PLOs One. 2016;11(6):e0156118. https://doi.org/10.1371/journal.pone.0156118
    » https://doi.org/10.1371/journal.pone.0156118
  • 46
    My C, Danchin M, Willaby HW, Pemberton S, Leask J. Parental attitudes, beliefs, behaviours and concerns towards childhood vaccinations in Australia: a national online survey. Aust Fam Physician [Internet]. 2017 [cited 2022 Oct 28];46(3):145-51. Available from: https://pubmed.ncbi.nlm.nih.gov/28260278/
    » https://pubmed.ncbi.nlm.nih.gov/28260278/
  • 47
    World Health Organization (WHO). Vaccines and immunization: myths and misconceptions[Internet]. 2020 [cited 2022 Jul 01]. Available from: https://www.who.int/news-room/questions-and-answers/item/vaccines-and-immunization-myths-and-misconceptions
    » https://www.who.int/news-room/questions-and-answers/item/vaccines-and-immunization-myths-and-misconceptions
  • 48
    Mckee C, Bohannon K. Exploring the reasons behind parental refusal of vaccines. J Pediatr Pharmacol Ther. 2016;21(2):104-9. https://doi.org/10.5863/1551-6776-21.2.104
    » https://doi.org/10.5863/1551-6776-21.2.104

Edited by

EDITOR IN CHIEF: Dulce Barbosa
ASSOCIATE EDITOR: Mitzy Danski

Publication Dates

  • Publication in this collection
    27 Nov 2023
  • Date of issue
    2023

History

  • Received
    02 Dec 2022
  • Accepted
    08 May 2023
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