Childhood Immunization Research Articles

Microbiota and gut immunity in infants and young children

The human gut microbiome plays a critical role in maintaining human health, particularly in the intricate relationship between stable microbial communities in the gastrointestinal tract and the early development of host immunity. After birth, the maturation of immune cells and the gut microbiome occur simultaneously, adapting to the complexities of the gut environment. The close link between the gut microbiome and the immune system has far-reaching implications, influencing the onset of several diseases in infants and young children, such as food allergies, necrotizing colitis, obesity, and inflammatory bowel disease. Consequently, the composition of the infant gut microbiome serves as a predictive factor for disease risk and progression. The establishment of a symbiosis between the immune system and the gut microbiome has significant implications for susceptibility or resistance to disease later in life. Maternal factors, including mode of delivery and feeding practices, exert a significant influence on the infant gut microbiota.

A systematic review on the effect of the COVID-19 pandemic on childhood immunisation programmes of West African countries

A systematic review on the effect of the COVID-19 pandemic on childhood immunisation programmes of West African countries

Progress in research and development of preventive vaccines for children in China.

The infant and child stage is an important stage for the continuation and development of human society. The initial years of life have a lasting impact on a child's future. Children under the age of 5 have an immature immune system, especially infants and young children under 6 months of age. At this stage, the population has a low immunity to pathogen infections, making them vulnerable to bacteria and viruses. Vaccination can enhance the immunity of infants and children to specific diseases, reduce the transmission rate of infectious diseases, and promote the development of global public health. This article summarizes the current application status of Rotavirus (RV) vaccine, Hand-foot -mouth disease (HFMD) vaccine, and Pneumococcal Conjugate Vaccine (PCV) in China, as well as the research progress of clinical trial vaccine, laying a foundation for subsequent vaccine development.

Epidemiological and bacterial profile ofchildhood meningitis in Tunisia.

The worldwide burden of disease of bacterial meningitis remains high, despite the decreasing incidence following introduction of routine vaccination campaigns.The aim of our study was to evaluate the epidemiological and bacteriological profile of paediatric bacterial meningitis (BM) in Tunisian children, during the period 2003-2019, following the implementation of Haemophilus influenzae type b (Hib) vaccine (April 2011) and before 10-valent pneumoccocal conjugate vaccine (PCV10) introduction to the childhood immunization program.All bacteriologically confirmed cases of BM admitted to children's hospital of Tunis were recorded (January 2003 to April 2019). Serogroups of Neisseria meningitidis (Nm) and serotypes of Streptococcus pneumoniae (Sp) and H. influenzae (Hi) and antibiotic resistance were determined using conventional and molecular methods.Among 388 cases, the most frequent species were Sp (51.3%), followed by Nm (27.5%) and Hi(16.8%). We observed a significant decrease in Hi BM rate during the conjugated Hib vaccine use period (P < 0.0001). The main pneumococcal serotypes were 14, 19F, 6B, 23F and 19A and the serotype coverage of PCV10, PCV13, PCV15 and PCV20 was 71.3 and 78.8%, 79.4 and 81.9% respectively. Themost frequent Nm serogroup was B (83.1%). Most Hi strains were of serotype b (86.9%). High levels of resistance were found: Sp and Nm to penicillin (respectively 60.1 and 80%) and Hi to ampicillin (42.6%). All meningococcal and Hi isolates were susceptible to third-generation cephalosporins and 7.2% of pneumococcal strains had decreased susceptibility to these antibiotics.The Hib conjugate vaccine decreased the rate of BM. Sp dominated the aetiology of BM in children in Tunisia. Conjugate vaccines introducing decreases not only BM cases but also antimicrobial resistance.

Effect of Exclusive Breastfeeding on the Risk of ARI in Under-Five Children: Literature Review

Introduction: Acute Respiratory Infection (ARI) is a major health problem in under-five children which can cause death. Exclusive breastfeeding can prevent infections, one of which is ARI. Objective: This study aims to examine the relationship between exclusive breastfeeding and the risk of ARI in under-five children. Method: This research uses a literature review approach which measures the relationship between exclusive breastfeeding and the risk of ARI in under-five children. The data source uses secondary data in the form of articles obtained through two databases, namely Scopus and Springer Link. Result: There are 5 articles that meet the requirements for research. Four out of five articles prove that exclusive breastfeeding reduces the risk of children under five getting ARI. The finding of a higher risk of ARI in the group of children under five who are not exclusively breastfed can be caused by a decrease in the immunity of children under five, seeing that breast milk is proven to fight infection. The content of sIgA and lactoferrin in breast milk and immunization can increase the immune system in children under five who suffer from ARI. Conclusion: Breast milk has nutrients in it which are useful for preventing infectious diseases, such as ARI and pneumonia in children under five. Given the influence on the health of children under five, the findings of this study demonstrate the need for improvements in breastfeeding programs, with a particular emphasis on exclusive breastfeeding and ARI management. There is a need for widely accessible health workers, information, and services connected to care for moms.

High burden of viruses and bacterial pathobionts drives heightened nasal innate immunity in children.

Studies during the COVID-19 pandemic showed that children had heightened nasal innate immune responses compared with adults. To evaluate the role of nasal viruses and bacteria in driving these responses, we performed cytokine profiling and comprehensive, symptom-agnostic testing for respiratory viruses and bacterial pathobionts in nasopharyngeal samples from children tested for SARS-CoV-2 in 2021-22 (n = 467). Respiratory viruses and/or pathobionts were highly prevalent (82% of symptomatic and 30% asymptomatic children; 90 and 49% for children <5 years). Virus detection and load correlated with the nasal interferon response biomarker CXCL10, and the previously reported discrepancy between SARS-CoV-2 viral load and nasal interferon response was explained by viral coinfections. Bacterial pathobionts correlated with a distinct proinflammatory response with elevated IL-1β and TNF but not CXCL10. Furthermore, paired samples from healthy 1-year-olds collected 1-2 wk apart revealed frequent respiratory virus acquisition or clearance, with mucosal immunophenotype changing in parallel. These findings reveal that frequent, dynamic host-pathogen interactions drive nasal innate immune activation in children.

Impact of the emergence of severe acute respiratory syndrome coronavirus 2 omicron variants on routine childhood immunization in Japan

BackgroundThe coronavirus disease 2019 (COVID-19) pandemic disrupted routine childhood vaccination worldwide, especially at the beginning of the pandemic. After the emergence of variants of concern, particularly the Omicron variants, the number of COVID-19 cases significantly increased, especially in children. However, the impact of the Omicron variants on routine childhood vaccination is unknown. MethodsThis retrospective observational study collected data on vaccines included in the Japanese national immunization program (NIP) of children 15 years or younger between 2016 and 2022 in Niigata, Japan. During the study period, hepatitis B virus vaccine and rotavirus vaccines were introduced to the NIP in October 2016 and October 2020, respectively. The monthly number of vaccine doses per eligible child population between 2020 and 2022 (pandemic period) was compared to the average number of vaccine doses in the corresponding month between 2016 and 2019 (pre-pandemic period). The effect of 8 surges of COVID-19 patients on trends in routine childhood vaccination was also analyzed. ResultsThe numbers of doses during the pre-Omicron pandemic period were comparable to the values administered before the pandemic. However, after the emergence of the Omicron variants, and especially after the surge of Omicron variant BA.5 in 2022, the number of vaccine doses declined. The decline was notable in second doses of MR vaccine at age 5–6 years by − 9.6 % and diphtheria-tetanus vaccine at ages 11–12 years by − 14.1 %. ConclusionsRoutine childhood immunization was significantly affected by the emergence of the Omicron variants most likely due to the facts that more candidates and their guardians contracted COVID-19, or were required isolation for close contacts. The findings highlight the importance of continued monitoring to maintain high coverage of routine childhood immunizations for controlling vaccine preventable diseases. A follow-up study should investigate changes in the number of declined vaccine doses during Omicron variant predominance.

Association between achieving adequate antenatal care and health-seeking behaviors: A study of Demographic and Health Surveys in 47 low- and middle-income countries.

Antenatal care (ANC) is essential for ensuring the well-being of pregnant women and their fetuses. This study models the association between achieving adequate ANC and various health and health-seeking indicators across wealth quintiles in low- and middle-income countries (LMICs). We analyzed data from 638,265 women across 47 LMICs using available Demographic and Health Surveys from 2010 to 2022. Via multilevel logistic regression analyses adjusted for a series of confounding variables and country and wealth quintile fixed effects, we estimated the projected impact of achieving adequate ANC utilization and quality on a series of health and health care indicators: facility birth, postnatal care, childhood immunizations, and childhood stunting and wasting. Achieving adequate levels of ANC utilization and quality (defined as at least 4 visits, blood pressure monitoring, and blood and urine testing) was positively associated with health-seeking behavior across the majority of countries. The strongest association was observed for facility birth, followed by postnatal care and child immunization. The strength of the associations varied across countries and wealth quintiles, with more significant ones observed in countries with lower baseline ANC utilization levels and among the lower wealth quintiles. The associations of ANC with childhood stunting and wasting were notably less statistically significant compared to other indicators. Despite rigorous adjustments for potential confounders, a limitation to the methodology is that it is possible that unobserved variables may still impact outcomes. Strengthening ANC is associated with improved use of other health care in LMICs. ANC could serve as a critical platform for improving health outcomes for mothers and their children, emphasizing its importance beyond direct impact on maternal and neonatal mortality.

The use of community-oriented primary care (COPC) model to generate vaccine demand: The case of a remote fishing community in Cameroon

BackgroundCameroon, a country in sub-Saharan Africa, ranks among the top 15 countries worldwide with the highest number of zero-dose (unvaccinated) children. Among other reasons, pockets of hard-to-reach communities that traditionally miss essential healthcare services, including childhood immunization, largely contribute to this sub-optimal vaccination coverage. This is the case of Manoka Health District (MHD), an archipelago district with a zero-dose proportion of 91.7%. High disease burdens such as malaria and water-borne diseases have forced the population to depend on herbalists and roadside drug vendors, eroding trust in the primary healthcare system and worsening vaccine hesitancy. This study, therefore, aims to describe how a project optimized vaccine demand generation in these hard-to-reach settlements using an integrated community health worker service delivery package developed using the Community-oriented primary healthcare (COPC) model. MethodologyThis cross-sectional descriptive study was based on data collected from November 2021 to August 2022 in three project-implementing health areas (Kombo Moukoko, Kooh, and Toube) in the Manoka health district. Data was collected on the integrated health packages offered by Community Health Workers (CHWs). It comprised health education on malaria and water-borne diseases, screening for malaria using Rapid Diagnostic Test (RDT), treatment of under-5 for uncomplicated malaria and diarrhea, conduct of essential Antenatal Care (ANC) services, and vaccination counseling and referral in the three health areas. Microsoft Excel 2013 was used to analyze descriptive data and expressed results as percentages, with tables and column charts used for data visualization. All missing data were considered in the final analysis. ResultsOver 550 under-5 children and 187 pregnant women were identified to be in need of curative and preventive care services during the project period. About 81% of pregnant women received a minimum ANC package by CHWs, and 47% adhered to referrals to health facilities for continuous ANC and delivery. Half of the children under 5 with health issues were diagnosed and managed for uncomplicated malaria. Also, during home visits, 617 under-immunized and zero-dose children less than two years of age were identified, referred, and vaccinated either during an outreach program or at the nearest health post in a neighboring health area, representing about 64% (617/964) of under-2 children identified in these communities. There was a gradual increase from 0% vaccine acceptance post-referral in the first month to 47% after six months and 64% at one year of intervention. ConclusionThe use of the COPC model to co-develop integrated essential health service packages that meet the needs of communities showed value in building trust and increasing childhood immunization uptake in hard-to-reach communities.

Exploring Vaccine Hesitancy Among Parents in a Rural Pediatric Clinic System: A Statistical Study.

Vaccine hesitancy has been a growing concern in the United States, particularly in rural areas where access to healthcare services may be limited. A rural pediatric clinic system in central Louisiana serves a population with historically low childhood immunization rates. This study explored the prevalence and determinants of vaccine hesitancy among parents of pediatric patients at the organization's clinics. A qualitative survey was conducted among parents who declined vaccines for their children at the organization's clinics. The survey collected information on parents' attitudes, beliefs, decision-making processes regarding childhood vaccinations, and demographic information about the parents, including income and education levels. Thematic analysis was used to identify key themes and patterns in the survey responses. Thirty out of 47 parents (response rate: 64%) completed the survey. Most respondents (n=24, 80%) expressed concerns about vaccine safety and potential side effects. Many parents (n=16, 60%) cited information from social media and alternative health sources as influencing their decision to decline vaccines. Religious and philosophical beliefs were also common reasons for vaccine refusal (n=13, 43%). Another significant theme was the lack of trust in healthcare providers and the pharmaceutical industry (n=17, 53%). No significant differences in responses were observed based on the parent's race or the child's sex. Ninety percent of participants (n=27) reported a household income of under $50,000, and 87% of participants (n=26) had a high school education or less. Vaccine hesitancy among parents in this rural pediatric population appears to be driven by concerns about vaccine safety, exposure to misinformation, religious and philosophical beliefs, and distrust in the healthcare system. Addressing these factors through targeted education, provider communication, and community engagement may be essential for improving childhood immunization rates in this vulnerable population. The findings highlight the need for culturally sensitive, evidence-based interventions to combat vaccine hesitancy in rural communities.

The Child Immunisation Programmes and Challenges in Bangladesh

The Child Immunisation Programmes and Challenges in Bangladesh

Worth a Shot: Experience and Lessons From an Unsuccessful Pediatric Immunization Quality Improvement Effort in a Large Health System During the COVID-19 Pandemic.

During the coronavirus disease of 2019 (COVID-19) pandemic, routine childhood immunization rates dropped dramatically across the world, and the Military Health System (MHS) was no exception. In the MHS, which is a large, universally covered, low-to-no-cost health system, the immunization rates with the measles, mumps, and rubella (MMR) vaccine remain below the rate necessary to prevent community transmission of measles. We aimed to improve childhood immunization rates in the MHS with an expansive quality improvement project. Measles, mumps, and rubella immunization rates served as proxy outcome measures for routine immunization rates tracked by the Center for Disease Control multi-immunization combination measures. The tracked measure was the percentage of 16- to 18-month olds and 6-year olds who had received MMR #1 and MMR #2, respectively. Various countermeasures were implemented throughout the study period, and standard quality improvement analyses informed the effect of countermeasures. By January 2023, the percentage of 16- to 18-month olds and 6-year olds who had received MMR #1 and MMR #2 was 85% and 91%, respectively, with no positive shift in immunization rates despite various countermeasures introduced during the study period. For reference, the MMR immunization rates of commercial health maintenance organization and commercial preferred provider organization for 24-month-old populations were 92% and 90.3%, respectively. On chart review, the most common cause for under-immunization (55%) was vaccine abandonment. MMR #1 rates rose to 92% in 24-month olds. Measles, mumps, and rubella immunization rates within the MHS remained below commercial health system rates and below public health standards required for herd immunity despite various countermeasures throughout the COVID-19 pandemic. Immunization rates increased with age, suggesting that children within the MHS eventually catch up despite potential barriers.

Raising Awareness on Children's Immunity and Cognitive Abilities: Nationwide Survey to Indonesian Parents

Early life nutrition influences the development of children's immunity and cognitive abilities. According to PISA 2018, only 29% of Indonesian students have a growth students that have growth mindset. The parent’s inability to understand and improve the multifactorial aspect of cognitive development pose risk to children's cognitive growth. To raise awareness among parents to strengthen their children’s cognitive and immunity through health education. Online survey with pretest and posttest, 4 questions each, distributed to Indonesian parents that attend online seminar about impact of children's immunity toward cognitive development. The data were further analyzed with t-test using SPSS. Survey of 334 participants shows that even before the intervention, Indonesian parents understand the relation between immune system and cognitive development in children thus showing no significant difference after intervention [p-value = 0.226]. However, they did not know how to observe or measure the cognitive score such as the 8 winning skills and growth mindset, also the nutrition needed to support cognitive abilities and immunity. The intervention prove a significant increase of parent's knowledge [Pre = 1.99 ± 0.83; Post = 3.08 ± 1.11; p-value = 0.000. Indonesian parents are aware that immunity affects cognitive growth of their children. However, there is still a lack of awareness or prior knowledge on cognitive measurement tools and components, and nutrition which is beneficial for immunity and cognitive growth.

An Appraisal of Routine Immunization Coverage Among Children 0-2 Years in Akure South Local Government Area of Ondo State

Immunization is a proven tool for controlling and eliminating life-threatening infectious diseases such as Tuberculosis, Poliomyelitis, Haemophilus Influenza type b (HIB), Diphtheria, Pertusis, Tetanus and Hepatitis B, neonatal tetanus yellow fever, measles, cerebrospinal meningitis and is estimated to avert between 2 and 3 million deaths each year. The objective of this study is to appraise routine immunization coverage among children 0-2 years in Akure South Local Government Area of Ondo State. This is a descriptive cross-sectional study, designed to appraise routine immunization coverage among children 0-2 years in Akure South Local Government Area of Ondo State. The study focused on children 0-2 years. Majority 102 (25.2%) of the respondents were within the age range of 25-29 years, 82 (20.5%) were &amp;gt;39 years. 314 (78.5%) were Yorubas. 385 (96.2%) had good knowledge while 15 (3.8%) had poor knowledge. 374 (93.5%) of the women have positive attitude while 26 (6.5%) of them have negative attitude. Most of the respondents, 391 (97.8%) of the respondents reported that they have taken their child to the health facility for immunization and 232 (58%) have taken their child to 4-5 immunization sessions. Based on the findings of the present study, it could be concluded that very few of the women had poor knowledge of childhood immunization, majority of the women had positive attitude score and practice of childhood immunization, practice of childhood immunization is quite high, and the uptake of childhood immunization is quite high.

Completion of maternal and child health continuum of care and associated factors among women in Gode district, Shebele Zone, Eastern Ethiopia, 2022

BackgroundThe Continuum of care for reproductive, maternal, newborn, and child health includes integrated service delivery for mothers and children from pre-pregnancy to delivery, the immediate postnatal period, and childhood. In Ethiopia, the magnitude of antenatal care, skilled delivery, postnatal care, and immunization for children have shown improvement. Despite this, there was limited research on the percentage of mothers who have completed maternal and child continuum care.ObjectiveTo assess the Completion of Maternal and Child Health Continuum of Care and Associated Factors among women in Gode District, Shebele Zone, Eastern Ethiopia ,2022.MethodA community-based cross-sectional study design applied from November 1–15, 2022. A stratified sampling method was applied. A woman who had two 14–24 months child preceding the data collection period were included in the study. An interviewer-administered semi-structured questioner had been used for data collection. Data collected by using kobo collect and analyzed using STATA version 17. Both Bivariable and multivariable logistic regression analyses were done. In multivariable analysis, variables having P-values ≤ 0.05 were taken as factors associated with the completion of the maternal and child health continuum of care.ResultThe Completion of maternal and child continuum of care was 13.5% (10.7-17.0%) in Gode district,2022. Accordingly, Husband occupation (Government employee) [AOR = 2.3, 95%CI 1.2–4.7] and perceived time to reach health facility (less than 30 min) [AOR = 2.96, 95%CI 1.2–7.5] were factors showing significant association with maternal and child health continuum of care among mothers in Gode district, Somali regional State;2022 at P-value ≤ 0.05.Conclusion and recommendationOnly 13.5% of mothers in Gode district received all of the recommended maternal and child health services during their pregnancy, childbirth, and postpartum period. The study found that two factors were associated with a higher likelihood of receiving Maternal and child continuum of care: Government employed husband and perceived time to reach a health facility. Governments can play a key role in increasing the maternal and child health continuum of care by investing by making health care facility accessible.

Modern contraceptive utilization and associated factors among postpartum women in Kena Woreda, Konso Zone, South Ethiopian Regional State, Ethiopia, 2023: mixed type community based cross-sectional study design

BackgroundEven though family planning 2020 has made remarkable progress about solving the issue of unmet need for family planning, 70% of women in a developing countries who do not want to conceive are not using it. There are limited research that provided detail information regarding barriers of modern contraceptive utilization during postpartum period in the study area. In addition, previous study also recommended that to conduct using mixed quantitative and qualitative design for further investigations to answer these “why” questions and narrow these gaps.ObjectiveThis study aimed to assess postpartum modern contraceptive utilization and associated factors among postpartum women in Kena woreda, Konso zone, South Ethiopian Regional State, Ethiopia, 2023.MethodsA mixed type community based cross-sectional study design was conducted among 605 women in Kena woreda, from September 1–30/2023 out of 628 sampled mothers. Multistage sampling technique was used to select study participant and data was collected using semi-structured pretested questionnaire and entered in to Epi data version 3.1 and then exported to STATA version 14 for analysis for quantitative. The association between variables was analyzed using bivariate and multivariable binary logistic regression and level of significant determined with adjusted odd ratio at 95% CI and P-value less than < 0.05. After translation and transcription, manual thematic analysis was applied to the qualitative data.ResultsThe prevalence of modern contraceptive use among women during postpartum period in Kena woreda was found to be 39.01% [95% CI: 35.18–42.96%]. Menses resumed (AOR = 1.63; 95% CI: 1.02, 2.59), linked to the family planning unit during their child`s immunization (AOR = 2.17; 95% CI: 1.45, 3.25), family planning counselling during antenatal care visit (AOR = 1.63; 95% CI: 1.10, 2.42) and good knowledge towards modern contraceptive (AOR = 1.53; 95% CI: 1.03, 2.26) were factors associated with postpartum contraceptive utilization. Partner oppose, myths and misconception, need for excess family size, religious prohibition, fear of side effect,menses not resumed, lack of counselling and privacy room, and lack of transportation to health facility were barriers to modern postpartum contraceptive utilization. Conclusions and recommendationsThe utilization of postpartum contraceptives was found to be lower than the target set by the 2020/21 national reproductive health strategy plan, which aimed to increase contraceptive method usage to 50%. Menses resumed, family planning counselling during antenatal care visit, linked to the family planning unit during child immunization and good knowledge were factors associated to modern postpartum contraceptive utilization. Strengthening service integration and family planning counseling during antenatal care visits and encourage mothers to start using modern family planning methods before menses resume are important. Overcoming barriers including partner opposition, myths, religious beliefs, fear of side effects, lack of counseling at health facilities, and transportation challenges is essential.

Social norms, vaccine confidence, and interpersonal communication as predictors of vaccination intentions: Findings from slum areas in Varanasi, India

In recent years, India has seen significant improvements in childhood immunization, but rates among the urban poor remain stagnant. Disruptions during COVID-19 pandemic have created further challenges. This paper focuses on how social norms, vaccine confidence, and interpersonal communication independently and jointly affect vaccine intentions among caregivers of infants living in six slum areas in Varanasi, India. Data for this study come from the baseline assessments conducted before implementing the Happy Baby Program, an intervention to improve vaccination attitudes and intentions. In-person interviews (N = 2,058) were conducted with caretakers of children up to two years old. Analyses showed that interpersonal communication about vaccines, descriptive norms, injunctive norms, and vaccine confidence were each associated with intentions to vaccinate in both a bivariate and, except for injunctive norms, a multivariate model. In addition, we found significant interactions among these variables, suggesting that the roles of interpersonal communication and vaccine confidence attenuated the relationship between social norms and vaccination intention. Overall, our model explained 46.2 % of the variance in vaccine intention. Given the strengths of the relationships observed in this study, intervention strategies should focus on enhancing social norms and vaccine confidence to promote vaccination.

Correlates of Zero-Dose Status among Children Aged 12-23 Months in the Luambo Health District, Democratic Republic of Congo: A Matched Case-Control Study.

(1) Background: "Zero-dose" (ZD) refers to a child who has not received any doses of the pentavalent (diphtheria-tetanus-pertussis-Haemophilus influenzae type b (Hib)-hepatitis B) vaccine. ZD children are vulnerable to vaccine-preventable diseases (VPDs). Luambo health district (HD) is one of 26 HDs in Kasai Central Province in Democratic Republic of the Congo and had the largest number of ZD children in 2021. This study was conducted to identify factors associated with ZD status among children in Luambo HD. (2) Methods: We conducted a mixed-methods study of children aged 12-23 months in Luambo HD. (3) Results: A total of 445 children aged 12-23 months were included in the study, including 89 cases and 356 controls. Children who were born in Angola (AOR = 3.2; 95% CI = 1.1 to 9.8; p = 0.046), born at home (AOR = 5.2; 95% CI = 2.1 to 12.5; p < 0.001), whose mothers did not receive antenatal care (AOR = 4.4; 95% CI = 1.2 to 16.3; p = 0.023), or did not know any vaccine preventable disease (AOR = 13.3; 95% CI = 4.6 to 38.4; p < 0.001) were more likely to be ZD than their counterparts. In addition, perceptions of children's parents influenced child immunization. (4) Conclusions: Factors associated with being a ZD child suggest inequalities in vaccination that need to be addressed through appropriate interventions. Maternal and child health services need to be strengthened while also targeting children's fathers. This will make it possible to considerably reduce the proportion of ZD and undervaccinated children and effectively fight against VPDs.

Unpacking the impact of COVID-19 on child immunization: evidence from Ghana

BackgroundWith the onset of the COVID-19 pandemic, governments implemented social distancing regulations to limit the spread of the disease. Some health experts warned that these measures could negatively affect access to essential health services, such as routine childhood immunizations. Others noted that without these regulations, COVID-19 cases would increase, leading to overburdened health systems.MethodsWe analyze four years (2018–2021) of monthly administrative data on childhood immunizations in all administrative districts in Ghana and exploit variations in social distancing regulations across districts. Given variations in social distancing regulations across Ghanaian districts, we can further differentiate between the effect of public lockdowns and the effect of the pandemic.ResultsWe find that child immunizations in Ghana declined by 6% during the public lockdown in April 2020, but the country compensated with higher vaccination rates starting in June, and immunization services recovered to pre-pandemic growth levels by 2021. Time-critical vaccines, such as polio, were not affected at all. We do find a substantially larger disruption in April 2020 (14%) and a slower recovery in 2020 in the 40 lockdown-affected districts. Interestingly, vaccination rates already decreased in February and March by about 5% before the public lockdown and before the pandemic had reached Ghana, but with the pandemic already spreading globally and in the news.ConclusionOur results indicate that the negative effect on child immunization was less severe and shorter than predicted by experts. Fear of COVID-19 and delayed vaccination campaigns had a substantial impact on childhood immunization while rising COVID-19 cases and moderate social distancing regulations did not seem to affect immunization rates.

Interventions addressing routine childhood immunization and its behavioral and social drivers.

Despite the advances in vaccination, there are still several challenges in reaching millions of children in low- and middle-income countries (LMICs). In this review, we present an extensive summary of the various strategies used for improving routine immunization in LMICs to aid program implementers in designing vaccination interventions. Experimental and quasi-experimental impact evaluations conducted in LMICs evaluating the effectiveness of interventions in improving routine immunization of children aged 0-5 years or the intermediate outcomes were included from 3ie's review of systematic reviews. Some additional impact evaluation studies published in recent years in select LMICs with large number of unvaccinated children were also included. Studies were coded to identify interventions and the barriers in the study context using the intervention framework developed in 3ie's Evidence Gap Map and the WHO's Behavioral and Social Drivers (BeSD) of vaccination framework, respectively. Qualitative analysis of the content was conducted to analyze the intervention strategies and the vaccination barriers that they addressed. One hundred and forty-two impact evaluations were included to summarize the interventions. To address attitudinal and knowledge related barriers to vaccination and to motivate caregivers, sensitization and educational programs, media campaigns, and monetary or non-monetary incentives to caregivers, that may or may not be conditional upon certain health behaviors, have been used across contexts. To improve knowledge of vaccination, its place, time, and schedule, automated voice messages and written or pictorial messages have been used as standalone or multicomponent strategies. Interventions used to improve service quality included training and education of health workers and providing monetary or non-monetary perks to them or sending reminders to them on different aspects of provision of vaccination services. Interventions like effective planning or outreach activities, follow-up of children, tracking of children that have missed vaccinations, pay-for-performance schemes and health system strengthening have also been used to improve service access and quality. Interventions aimed at mobilizing and collaborating with the community to impact social norms, attitudes, and empower communities to make health decisions have also been widely implemented.