B Cell Receptor Transgenic Mice as Tools to Study Memory B Cells.

B cell receptor (BCR) transgenic mice allow the control of the initial target (antigen) specificity of naïve B cells and to investigate their properties following activation. Here, I describe how BCR transgenic B cells can be used in combination with adoptive cell transfer and immunization models to study memory B cell formation and reactivation.

Service disruptions, trauma and burnout during the COVID-19 pandemic among healthcare providers delivering immunisation and maternal and child health services in Indonesia.

BACKGROUND: The COVID-19 pandemic resulted in extreme strain on health systems including the health workforce, essential health services and vaccination coverage. We examined disruptions to immunisation and maternal and child health (MCH) services, concerns of personal well-being and delivery of healthcare during the pandemic as well as factors associated with self-reported trauma or burnout among healthcare providers (HCPs). METHODS: In March-April 2022, we conducted a cross-sectional survey among HCPs in two provinces of Indonesia. HCPs involved in COVID-19 or routine immunisation and MCH services were randomly selected from district/city health office registration lists. We descriptively analysed service disruptions experienced by HCPs as well as trauma, burnout and concerns of personal well-being and delivery of healthcare during the pandemic. Multivariate logistic regression analyses were undertaken to identify factors associated with trauma or burnout. RESULTS: We recruited 604 HCPs. Mobilisation of staff from routine health services to COVID-19 response duties was a key reason for service disruptions (87.9%). Strategies such as community outreach and task shifting were implemented to overcome disruptions. Trauma or burnout during the pandemic was reported by 64.1% HCPs, with 23.5% reporting worse mental or emotional health.Factors associated with trauma or burnout included delivery of COVID-19 immunisation (adjusted OR (aOR) 2.54, 95% CI 1.08 to 5.94); and delivery of both COVID-19 immunisation and routine immunisation compared with no involvement in vaccination programmes (aOR 2.42, 95% CI 1.06 to 5.52); poor treatment in the workplace (aOR 2.26, 95% CI 1.51 to 3.38) and lower confidence to respond to patient queries on COVID-19 immunisation (aOR 1.51, 95% CI 1.03 to 2.22). CONCLUSION: HCPs experienced service disruptions, trauma and burnout and implemented strategies to minimise disruptions to service delivery and improve patient experiences. Our study highlights the need to ensure that workforce resilience and strategies to protect and support HCPs are considered for pandemic planning, preparedness and management.

Cyclic Peptide Conjugate Vaccines and Physically Mixed Cyclic Peptide Vaccines for Subcutaneous Immunization.

Immune stimulants (adjuvants) enhance immune system recognition to provide an effective and individualized immune response when delivered with an antigen. Synthetic cyclic deca-peptides, co-administered with a toll-like receptor targeting lipopeptide, have shown self-adjuvant properties, dramatically boosting the immune response in a murine model as a subunit peptide-based vaccine containing group A Streptococcus peptide antigens.Here, we designed a novel peptide and lipid adjuvant system for the delivery of group A Streptococcus peptide antigen and a T helper peptide epitope. Following linear peptide synthesis on 2-chlorotrityl chloride resin, the linear peptide was cleaved and head-to-tail cyclized in solution. The selective arrangement of amino acids in the deca-peptide allowed for selective conjugation of lipids and/or peptide antigens following cyclisation. Using both solution-phase peptide chemistry and copper-catalyzed azide-alkyne cycloaddition reaction were covalently (and selectively) ligated lipid and/or peptide antigens onto the cyclic deca-peptide core. Subcutaneous administration of the vaccine design to mice resulted in the generation of a large number of serum immunoglobulin (Ig) G antibodies.

Polyclonal Peptide Antisera.

Polyclonal antibodies are relatively easy to produce and may supplement monoclonal antibodies for some applications or even have some advantages.The choice of species for production of (peptide) antisera is based on practical considerations, including availability of immunogen (vaccine) and animals. Two major factors govern the production of antisera: the nature of adaptive immune responses, which take place over days/weeks and ethical guidelines for animal welfare.Here, simple procedures for immunization of mice, rabbits, sheep, goats, pigs, horses, and chickens are presented.

Enhancing cross-protection against influenza by heterologous sequential immunization with mRNA LNP and protein nanoparticle vaccines.

Enhancing influenza vaccine cross-protection is imperative to alleviate the significant public health burden of influenza. Heterologous sequential immunization may synergize diverse vaccine formulations and routes to improve vaccine potency and breadth. Here we investigate the effects of immunization strategies on the generation of cross-protective immune responses in female Balb/c mice, utilizing mRNA lipid nanoparticle (LNP) and protein-based PHC nanoparticle vaccines targeting influenza hemagglutinin. Our findings emphasize the crucial role of priming vaccination in shaping Th bias and immunodominance hierarchies. mRNA LNP prime favors Th1-leaning responses, while PHC prime elicits Th2-skewing responses. We demonstrate that cellular and mucosal immune responses are pivotal correlates of cross-protection against influenza. Notably, intranasal PHC immunization outperforms its intramuscular counterpart in inducing mucosal immunity and conferring cross-protection. Sequential mRNA LNP prime and intranasal PHC boost demonstrate optimal cross-protection against antigenically drifted and shifted influenza strains. Our study offers valuable insights into tailoring immunization strategies to optimize influenza vaccine effectiveness.

Ionic Liquid-Based Immunization Patch for the Transdermal Delivery of Antigens.

Herein, we report a transdermal patch prepared using an ionic liquid-based solid in oil (IL-S/O) nanodispersion and a pressure-sensitive adhesive (PSA) to deliver the macromolecular antigenic protein, ovalbumin (OVA). The IL-S/O nanodispersion and a PSA were first mixed at an equal weight ratio, then coated onto a release liner, and covered with a support film. To evaluate the effect of the PSA, three types of PSAs, DURO-TAK 87-4098, DURO-TAK 87-4287, and DURO-TAK 87-235A, were used to obtain the corresponding IL-S/O patches SP-4098, SP-4287, and SP-235A, respectively. The prepared IL-S/O patches were characterized for surface morphology, viscoelasticity, and moisture content. In vitro skin penetration and in vivo immunization studies of the IL-S/O patches were performed using Yucatan micropig skin and the C57BL/6NJc1 mice model, respectively. The SP-4098 and SP-4287 delivered 5.49-fold and 5.47-fold higher amounts of drug compared with the aqueous formulation. Although both patches delivered a similar amount of drug, SP-4287 was not detached fully from the release liner after 30 days, indicating low stability. Mice immunized with the OVA-containing SP-4098 produced a 10-fold increase in anti-OVA IgG compared with those treated with an aqueous formulation. These findings suggested that the IL-S/O patch may be a good platform for the transdermal delivery of antigen molecules.

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

Introduction: 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. Methods: 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. Results and conclusion: 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.

Educational interventions for the prevention and management of adverse events following immunisation: a systematic review. / Intervenções educativas para prevenção e conduta dos eventos adversos pós-vacinação: uma revisão sistemática.

This study investigated educational interventions for the prevention and management of adverse events following immunisation. This a systematic review was conducted by examining observational studies, with no restriction as to language or year, registered in PROSPERO with the identifier CRD42022313144 and by searching the MEDLINE, LILACS, Embase, CINAHL and Scopus databases. Two researchers selected the studies, extracted the data and assessed the risk of study bias; disagreements were resolved by a third researcher. A total of six articles met the inclusion criteria of the systematic review and the studies reported significant post-intervention improvements in staff conduct in relation to immunisation. It was concluded that educational strategies that lead to continued professional development in relation to vaccination in primary care were effective in reducing and/or eradicating immunisation errors and adverse events following immunisation.

O estudo tem como objetivo investigar as intervenções educativas para a prevenção e conduta dos eventos adversos pós-vacinação. Trata-se de uma revisão sistemática realizada por meio da análise de estudos observacionais sem restrição de idioma e ano com registro no PROSPERO pelo identificador CRD42022313144 e busca nas bases de dados MEDLINE, LILACS, Embase, CINAHL e Scopus. Dois pesquisadores selecionaram os estudos, extraíram os dados e avaliaram o risco de viés, as discordâncias foram resolvidas por um terceiro pesquisador. Atenderam os critérios de inclusão da revisão sistemática um total de seis artigos e os estudos apresentaram melhoras significativas pós-intervenção na conduta dos profissionais em relação à imunização. Conclui-se que o fornecimento de estratégias educativas de educação permanente no âmbito vacinal da atenção primária é eficaz para reduzir e/ou erradicar os erros de imunização e eventos adversos pós-vacinação.

IL-10 inhibition during immunization improves vaccine-induced protection against Staphylococcus aureus infection.

Staphylococcus aureus is a major human pathogen. An effective anti-S. aureus vaccine remains elusive as the correlates of protection are ill-defined. Targeting specific T cell populations is an important strategy for improving anti-S. aureus vaccine efficacy. Potential bottlenecks that remain are S. aureus-induced immunosuppression and the impact this might have on vaccine-induced immunity. S. aureus induces IL-10, which impedes effector T cell responses, facilitating persistence during both colonization and infection. Thus, it was hypothesized that transient targeting of IL-10 might represent an innovative way to improve vaccine efficacy. In this study, IL-10 expression was elevated in the nares of persistent carriers of S. aureus, and this was associated with reduced systemic S. aureus-specific Th1 responses. This suggests that systemic responses are remodeled because of commensal exposure to S. aureus, which negatively implicates vaccine function. To provide proof of concept that targeting immunosuppressive responses during immunization may be a useful approach to improve vaccine efficacy, we immunized mice with T cell-activating vaccines in combination with IL-10-neutralizing antibodies. Blocking IL-10 during vaccination enhanced effector T cell responses and improved bacterial clearance during subsequent systemic and subcutaneous infection. Taken together, these results reveal a potentially novel strategy for improving anti-S. aureus vaccine efficacy.

Single-cell analysis reveals lasting immunological consequences of influenza infection and respiratory immunization in the pig lung.

The pig is a natural host for influenza viruses and integrally involved in virus evolution through interspecies transmissions between humans and swine. Swine have many physiological, anatomical, and immunological similarities to humans, and are an excellent model for human influenza. Here, we employed single cell RNA-sequencing (scRNA-seq) and flow cytometry to characterize the major leukocyte subsets in bronchoalveolar lavage (BAL), twenty-one days after H1N1pdm09 infection or respiratory immunization with an adenoviral vector vaccine expressing hemagglutinin and nucleoprotein with or without IL-1ß. Mapping scRNA-seq clusters from BAL onto those previously described in peripheral blood facilitated annotation and highlighted differences between tissue resident and circulating immune cells. ScRNA-seq data and functional assays revealed lasting impacts of immune challenge on BAL populations. First, mucosal administration of IL-1ß reduced the number of functionally active Treg cells. Second, influenza infection upregulated IFI6 in BAL cells and decreased their susceptibility to virus replication in vitro. Our data provide a reference map of porcine BAL cells and reveal lasting immunological consequences of influenza infection and respiratory immunization in a highly relevant large animal model for respiratory virus infection.

As vacinas contra a covid-19 em plataformas de vídeos curtos no Brasil: o caso do Kwai / Covid-19 vaccines on short video platforms in Brazil: the case of Kwai / Las vacunas contra la covid-19 en plataformas de videos cortos en Brasil: el caso del Kwai

Neste artigo, analisamos as temáticas, os posicionamentos, as formas expressivas, os atores legitimados e os recursos visuais e sonoros empregados na produção de 482 vídeos sobre vacinas, publicados de 2020 a 2022 na plataforma de vídeos curtos Kwai. A partir de análise temática e de análise de conteúdo, identificamos que os vídeos apresentaram, em sua maioria, posicionamento favorável ou neutro em relação às vacinas e que ressaltaram as experiências pessoais com a vacinação. Não obstante, utilizaram sobretudo um tom hu-morístico no tratamento do assunto, com potencial desinformativo quanto aos efeitos colaterais das vacinas. Concluímos assim que, por um lado, o Kwai tem sido utilizado para expressão de experiências positivas com a vacinação, que podem estimular a adesão aos imunizantes, mas, por outro, tem sido também espaço para a circulação de percepções negativas e temores que podem suscitar dúvidas quanto à segurança das vacinas.

In this article, we analyze the themes, positions, expressive forms, legitimized actors, and both visual and sound resources used in the production of 482 videos about vaccines, published from 2020 to 2022 on the short video platform Kwai. Based on thematic analysis and content analysis, we identified that the videos predominantly presented a favorable or neutral stance toward vaccines and that they highlighted personal experiences with immunization. However, they mainly used a humorous tone when dealing with the subject, thereby potentially disseminating misinformation regarding the adverse effects of vaccines. We thus conclude that, on the one hand, Kwai has been used to express positive experiences with vaccination, which can stimulate adherence to vaccinations, but, on the other hand, it has also been a space for the circulation of negative perceptions and fears that can raise doubts regarding the safety of vaccines.

En este artículo, analizamos los temas, posiciones, formas expresivas, actores legitimados y recursos visuales y sonoros utilizados en la producción de 482 videos sobre vacunas publicados de 2020 a 2022 en la plataforma de videos cortos Kwai. A partir del análisis temático y de contenido, identificamos que los videos presentaban, en su mayoría, una posición favorable o neutral con relación a las vacunas y que destacaban experiencias per-sonales con la vacunación. Sin embargo, al abordar el tema, utilizaron, principalmente, un tono humorístico, con potencial desinformativo sobre los efectos secundarios de las vacunas. De ese modo, concluimos que, por un lado, el Kwai tiene sido utilizado para expresar experiencias positivas con la vacunación que pueden estimular la adhesión a las vacunas, pero, por otro lado, también tiene sido un espacio para la circulación de percepciones negativas y miedos que pueden plantear dudas sobre la seguridad de las vacunas.

#VACINAPARATODOS: sentidos atribuídos por brasileiros à primeira dose da imunização contra a covid-19 no Instagram / #VACINAPARATODOS: meanings attributed by Brazilians to the first dose of immunization against covid-19 on Instagram / #VACINAPARATODOS: significados atribuidos por brasileños a la primera dosis de inmunización contra covid-19 en InstagramAutor

Este artigo se baseia em uma pesquisa que teve como objetivoapreender os sentidos atribuídos por brasileiros à primeira dose da imunização contra a covid-19. Trata-se de uma análise netnográfica. Os dados foram coletados em 2021 por meio da hashtag VACINAPARATODOS no Instagram. Os métodos utilizados para análise de dados foram: análise de similitude, com auxílio do software IRAMUTEQ e da análise do Discourse of the collective subject (discurso do sujeito coletivo), de Lefevre. Os resultados apontaram como ideias centrais: a emoção positiva e o sentimento de gratidão; a emoção negativa e o sentimento atribuído às vidas perdidas e ao negacionismo; o significado da primeira dose e o sentimento de esperança; a imunização e o exercício da cidadania: ato de consciência, responsabilidade e respeito. Os sentidos atrelados à oportunidade de acesso à vacina mostraram a dualidade de sentimentos que vão desde sensações positivas de reconhecimento e valorização até sentimentos negativos, de revolta e indignação, diante da hesitação vacinal e dos discursos antivacina.

This article bases on a research that aimed to understand the meanings attributed by Brazilians to the first dose of immunization against covid-19. A netnographic analysis was carried out. The data was collected in 2021 using the hashtag VACINAPARATODOS on Instagram. The methods used analyse the data were: similarity analysis, with the aid of the IRAMUTEQ software and of the analysis of Discourse of the collective subject, developed by Lefevre. The results pointed out the following central ideas: positive emotion and a feeling of gratitude; the negative emotion and a feeling attributed to lost lives and to denialism; the meaning of the first dose and the feeling of hope; the immunization and the exercise of citizenship: an act of conscience, responsibility and respect. The meanings linked to the opportunity to access the vaccine showed a duality of feelings ranging from positive feelings of recognition and appreciation to negative feelings of revolt and indignation, in the face of vaccine hesitancy and of the anti-vaccine discourses.

Este artículo se basa en una investigación que tuvo como objetivo comprender los significados atribuidos por los brasileños a la primera dosis de inmunización contra la covid-19. Se realizó un análisis netnográfico. Los datos fueron recogidos en 2021 a través del hashtag VACINAPARATODOS en Instagram. Los métodos utilizados para el análisis de los datos fueron: análisis de similitud, con ayuda del softwareIRAMUTEQ y del análisis del Discourse of collective subject (Discurso del sujeto colectivo), de Lefevre. Los resultados evidenciaron como ideas centrales: la emoción positiva y el sentimiento de gratitud; la emoción negativa y el sentimiento atribuido a las vidas perdidas y al negacionismo; el significado de la primera dosis y el sentimiento de esperanza; la inmunización y el ejercicio de la ciudadanía: un acto de conciencia, responsabilidad y respeto. Los significados vinculados a la oportunidad de acceder a la vacuna mostraron la dualidad de sentimientos que van desde sentimientos positivos de reconocimiento y aprecio hasta sentimientos negativos de revuelta y indignación, frente a las dudas sobre las vacunas y los discursos antivacunas.

Magnitude of self-harm and associated factors among postnatal mothers attending immunization clinics at public health facilities in Boneya Boshe Woreda, Western Ethiopia, 2023: institution-based cross-sectional study design.

Background: Self-harm is a preventable, but a leading, cause of maternal morbidity and mortality all over the world, with a significant impact on healthcare systems. Objective: To assess the magnitude of self-harm and associated factors among postnatal mothers attending immunization clinics. Methods: An institution-based cross-sectional study was employed among postnatal mothers attending infant immunization clinics at public health facilities in Boneya Boshe Woreda, Western Ethiopia, 1 October to 30 October 2023. A pretested, face-to-face interviewer-administered structured questionnaire prepared by Kobo Toolbox was used to collect the data. Both bivariable and multivariable logistic regression analyses were done. The level of significance was declared at p-value <0.05 with a 95% CI. Results: Among the 423 mothers enrolled in the study, 415 of them finally participated, at a response rate of 98.10%. The magnitude of self-harm was 12.53% (95% CI: 9.33, 15.73). Involvement of husband in maternity and child healthcare (AOR = 1.90; 95% CI: 1.12, 2.10), depression (AOR = 2.79; 95% CI: 2.14, 6.94), loneliness (AOR = 2.49; 95% CI: 1.15, 5.40), postpartum intimate partner violence (AOR = 2.15; 95% CI: 1.01, 4.54), average monthly income (AOR = 3.70; 95% CI: 2.17, 10.50), and postnatal care (AOR = 2.72; 95% CI: 1.28, 5.80) were significantly associated factors. Conclusion and recommendations: The study sought a magnitude of self-harm that was slightly higher than the previous study conducted in the northern part of Ethiopia. Therefore, healthcare providers should focus on identified factors during postnatal care to overcome them. Similarly, the concerned body should develop an effective strategy based on the identified factors to pay attention to postnatal mothers.

Lung ILC2s are activated in BALB/c mice born to immunized mothers despite complete protection against respiratory syncytial virus.

Activated lung ILC2s produce large quantities of IL-5 and IL-13 that contribute to eosinophilic inflammation and mucus production following respiratory syncytial virus infection (RSV). The current understanding of ILC2 activation during RSV infection, is that ILC2s are activated by alarmins, including IL-33, released from airway epithelial cells in response to viral-mediated damage. Thus, high levels of RSV neutralizing maternal antibody generated from maternal immunization would be expected to reduce IL-33 production and mitigate ILC2 activation. Here we report that lung ILC2s from mice born to RSV-immunized dams become activated despite undetectable RSV replication. We also report, for the first time, expression of activating and inhibitory Fcgamma receptors on ILC2s that are differentially expressed in offspring born to immunized versus unimmunized dams. Alternatively, ex vivo IL-33-mediated activation of ILC2s was mitigated following the addition of antibody: antigen immune complexes. Further studies are needed to confirm the role of Fcgamma receptor ligation by immune complexes as an alternative mechanism of ILC2 regulation in RSV-associated eosinophilic lung inflammation.

Mapping geographical inequalities of incomplete immunization in Ethiopia: a spatial with multilevel analysis.

Background: Immunization is one of the most cost-effective interventions, averting 3.5-5 million deaths every year worldwide. However, incomplete immunization remains a major public health concern, particularly in Ethiopia. The objective of this study is to investigate the geographical inequalities and determinants of incomplete immunization in Ethiopia. Methods: A secondary analysis of the mini-Ethiopian Demographic Health Survey (EDHS 2019) was performed, utilizing a weighted sample of 3,865 children aged 12-23 months. A spatial auto-correlation (Global Moran's I) statistic was computed using ArcGIS version 10.7.1 to assess the geographical distribution of incomplete immunization. Hot-spot (areas with a high proportion of incomplete immunization), and cold spot areas were identified through Getis-Ord Gi* hot spot analysis. Additionally, a Bernoulli probability-based spatial scan statistics was conducted in SaTScan version 9.6 software to determine purely statistically significant clusters of incomplete immunization. Finally, a multilevel fixed-effects logistic regression model was employed to identify factors determining the status of incomplete immunization. Results: Overall, in Ethiopia, more than half (54%, 95% CI: 48-58%) of children aged 12-23 months were not fully immunized. The spatial analysis revealed that the distribution of incomplete immunization was highly clustered in certain areas of Ethiopia (Z-score value = 8.379419, p-value < 0.001). Hotspot areas of incomplete immunization were observed in the Afar, Somali, and southwestern parts of Ethiopia. The SaTScan spatial analysis detected a total of 55 statistically significant clusters of incomplete immunization, with the primary SaTScan cluster found in the Afar region (zones 1, 3, and 4), and the most likely secondary clusters detected in Jarar, Doola, Korahe, Shabelle, Nogob, and Afdar administrative zones of the Somali region of Ethiopia. Indeed, in the multilevel mixed-effect logistic regression analysis, the respondent's age (AOR: 0.92; 95% CI: 0.86-0.98), residence (AOR: 3.11, 95% CI: 1.36-7.14), living in a pastoralist region (AOR: 3.41; 95% CI: 1.29-9.00), educational status (AOR: 0.26; 95% CI: 0.08-0.88), place of delivery (AOR: 2.44; 95% CI: 1.15-5.16), and having PNC utilization status (AOR: 2.70; 95% CI: 1.4-5.29) were identified as significant predictors of incomplete immunization. Conclusion and recommendation: In Ethiopia, incomplete immunization is not randomly distributed. Various factors at both individual and community levels significantly influence childhood immunization status in the country. It is crucial to reduce disparities in socio-demographic status through enhanced collaboration across multiple sectors and by bolstering the utilization of maternal health care services. This requires concerted efforts from stakeholders.

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

BACKGROUND: With 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. METHODS: We 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. RESULTS: We 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. CONCLUSION: Our 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.