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Abstract This study examined the spatial distribution and social inequalities in COVID-19 vaccine coverage among children aged 5-11 in Brazil. First and second dose vaccine coverage was calculated for all Brazilian municipalities and analyzed by geographic region and deciles based on human development index (HDI-M) and expected years of schooling at 18 years of age. Multilevel models were used to determine the variance partition coefficient, and bivariate local Moran's I statistic was used to assess spatial association. Results showed significant differences in vaccine coverage rates among Brazilian municipalities, with lower coverage in the North and Midwest regions. Municipalities with lower HDI and expected years of schooling had consistently lower vaccine coverage rates. Bivariate clustering analysis identified extensive concentrations of municipalities in the Northern and Northeastern regions with low vaccine coverage and low human development, while some clusters of municipalities in the Southeast and South regions with low coverage were located in areas with high HDI-M. These findings highlight the persistent municipal-level inequalities in vaccine coverage among children in Brazil and the need for targeted interventions to improve vaccine access and coverage in underserved areas.

Resumo O estudo analisou a distribuição espacial e as desigualdades sociais na cobertura vacinal para COVID-19 entre crianças de 5 a 11 anos no Brasil. As coberturas vacinais foram calculadas para os municípios brasileiros e analisadas por região geográfica e decis com base no Índice de Desenvolvimento Humano (IDH-M) e expectativa de escolaridade aos 18 anos. Modelos multiníveis foram usados ​​para determinar o coeficiente de partição da variância, e a estatística local bivariada de Moran I foi usada para avaliar a associação espacial. Os resultados mostraram diferenças significativas nas taxas de cobertura vacinal entre os municípios, com menor cobertura nas regiões Norte e Centro-Oeste. Municípios com menor IDH e anos de escolaridade esperados apresentaram menores taxas de cobertura vacinal. A análise de agrupamento bivariado identificou extensas concentrações de municípios nas regiões Norte e Nordeste com baixa cobertura vacinal e baixo desenvolvimento humano, enquanto alguns aglomerados de municípios nas regiões Sudeste e Sul com baixa cobertura localizavam-se em áreas com alto IDH-M. Essas descobertas destacam as desigualdades persistentes em nível municipal na cobertura vacinal entre crianças e a necessidade de intervenções para melhorar o acesso e a cobertura vacinal em áreas mais vulneráveis.

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Introducción. El descenso de las coberturas de vacunación fue muy significativo en la última década. Los pediatras son una pieza fundamental para recuperar coberturas y aumentar la confianza en la vacunación. Objetivos. Describir la percepción de los pediatras acerca del conocimiento y prácticas sobre vacunas, e identificar barreras en el acceso. Métodos. Estudio analítico observacional, mediante encuesta en línea. Se incluyeron variables del perfil del profesional, capacitación y barreras en inmunizaciones. Resultados. Participaron 1696 pediatras (tasa de respuesta: 10,7 %), media de 50,4 años. El 78,7 % fueron mujeres. El 78,2 % contaba con ≥10 años de ejercicio profesional. El 78,4 % realizaba atención ambulatoria y el 56,0 % en el subsector privado. El 72,5 % realizó una capacitación en los últimos 2 años. Se manifestaron "capacitados" para transmitir a sus pacientes los beneficios de las vacunas: 97,2 %; objetivos de campañas: 87,7 %; contraindicaciones: 82,4 %; efectos adversos: 78,9 %; recupero de esquemas: 71,2 %; notificación de ESAVI: 59,5 %. La proporción fue estadísticamente superior, en todos los aspectos, en pediatras con ≥10 años de ejercicio y en aquellos con capacitación reciente (p ≤ 0,01). Barreras identificadas en el acceso a la vacunación: falsas contraindicaciones (62,3 %); falta temporaria de vacunas (46,4 %); motivos culturales (41,4 %); horario restringido del vacunatorio (40,6 %). Conclusiones. La percepción del grado de capacitación fue variable según el aspecto de la vacunación. Aquellos con mayor tiempo de ejercicio profesional y con actualización reciente se manifestaron con mayor grado de capacidad. Se identificaron múltiples barreras frecuentes asociadas al acceso en la vacunación.

Introduction. The decline in vaccination coverage has been very significant in the past decade. Pediatriciansplay a key role in catching-up coverage and increasing confidence in vaccination. Objectives. To describe pediatricians' perceptions of vaccine knowledge and practices and to identify barriers to access. Methods. Observational, analytical study using an online survey. Variables related to professional profile, training and barriers to vaccination were included. Results. A total of 1696 pediatricians participated (response rate: 10.7%). Their mean age was 50.4 years; 78.7% were women; 78.2% had ≥ 10 years of experience; 78.4% provided outpatient care and 56.0%, in the private subsector; and 72.5% received training in the past 2 years. Respondents described themselves as "trained" in convey the following aspects to their patients: benefits of vaccines: 97.2%; campaign objectives: 87.7%; contraindications: 82.4%; adverse effects: 78.9%; catchup vaccination: 71.2%; reporting of events supposedly attributable to vaccination or immunization: 59.5%. The proportion was statistically higher in all aspects, among pediatricians with ≥ 10 years of experience and those who received training recently (p ≤ 0.01). The barriers identified in access to vaccination were false contraindications (62.3%), temporary vaccine shortage (46.4%), cultural reasons (41.4%), and restricted vaccination center hours (40.6%). Conclusions. The perception of the level of training varied depending on the vaccination-related aspect. Pediatricians with more years of professional experience and those who received recent updates perceivedthemselves as more trained. Multiple barriers associated with access to vaccination were identified.

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El Ministerio de Salud Pública y Bienestar Social inició con el plan de vacunación contra el SARS COV 2, priorizando en la primera etapa a los grupos de mayor vulnerabilidad, quienes correspondían entre otros al personal de salud; en ese sentido el Programa Ampliado de Inmunizaciones (PAI) ha iniciado con el proceso de selección y capacitación de los personales de enfermería en los lineamientos técnicos y operativos del plan de vacunación, sistema de información y de vigilancia de eventos supuestamente atribuidos a la vacunación e inmunización. Objetivo: Determinar la incidencia de reacciones adversas de las vacunas contra el COVID 19 (CoronaVac®, Astrazeneca® y Covaxin®) en personal de salud de los sectores públicos y privados de la XIV Región Sanitaria Canindeyú. Metodología: Estudio cuantitativo, descriptivo de corte transversal. Resultados: Entre los efectos leves de mayor frecuencia fueron el dolor en el sitio de aplicación, siendo para la vacuna Covaxin® en un 63.6% y para la vacuna Astrazeneca® 62.8%. Con relación a los efectos generales la dispepsia fue la reacción más observada (86.6% para la vacuna Covaxin® y 83.3% para vacuna CoronaVac®), y falta de energía y motivación (vacuna Astrazeneca® con un 34.9%). Discusión: el estudio muestra claramente que existen diferencias en la observación de efectos leves provocados por diferentes vacunas. En esta oportunidad se han observado tres vacunas, resaltando que estos efectos leves son comunes, frecuentes y generalmente temporales en las vacunas.

The Ministry of Public Health and Social Welfare began the vaccination plan against SARS COV 2, prioritizing in the first stage the most vulnerable groups, which corresponded, among others, to health personnel; In this sense, the Expanded Immunization Program (PAI) has begun the process of selection and training of nursing personnel in the technical and operational guidelines of the vaccination plan, information system and surveillance of events supposedly attributed to vaccination and immunization. Objective: Determine the incidence of adverse reactions to COVID 19 vaccines (CoronaVac®, Astrazeneca® and Covaxin®) in health personnel from the public and private sectors of the XIV Canindeyú Health Region. Methodology: Quantitative, descriptive cross-sectional study. Results: Among the most frequent mild effects were pain at the application site, being 63.6% for the Covaxin® vaccine and 62.8% for the Astrazeneca® vaccine. In relation to the general effects, dyspepsia was the most observed reaction (86.6% for the Covaxin® vaccine and 83.3% for the CoronaVac® vaccine), and lack of energy and motivation (Astrazeneca® vaccine with 34.9%). Discussion: The study clearly shows that there are differences in the observation of mild effects caused by different vaccines. On this occasion, three vaccines have been observed, highlighting that these mild effects are common, frequent and generally temporary in vaccines.

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INTRODUCTION: The overall incidence of tuberculosis (TB) in France is low; thus, BCG vaccination is no longer mandatory. In French Guiana - a French overseas territory - BCG vaccination is strongly recommended because the incidence of TB is high in the context of mass immigration from endemic countries with low BCG vaccination rates. Thus, it is important to assess Bacillus Calmette-Guérin (BCG) vaccination coverage and its predictors. METHODS: We used data from the 2014 French Guiana Yellow Fever survey, which was conducted by the Observatoire Régional de la Santé de Guyane. Demographic and immunization data from eligible children and their families were collected using a questionnaire. Children who had an immunization card and who were no older than 7 years of age at the time of the survey were eligible. The Coverage for BCG and other mandatory vaccines were estimated; the delay in BCG vaccination was also computed. Univariate and multivariate analyses identified predictors associated with BCG immunization and BCG delayed immunization (after 2 months of age). RESULTS AND CONCLUSION: Overall, 469 children were eligible for this study. The total BCG coverage was 79.5 %, and the proportion of children vaccinated with delay was 50.7 %. The multivariate analysis indicated that BCVA was significantly greater among children younger than 3 years of age, whose household head was employed and whose education level was greater. None of the predictors were associated with the delay of BCG vaccination.

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Objective: To provide an overview of the status of the childhood vaccination schedule in the Americas, outline program structures, and identify updated implementation strategies to improve vaccination coverage following the COVID-19 pandemic. Methods: A group of experts in pediatrics, epidemiology, vaccines, and global and public health discussed the current status of the childhood vaccination schedule in the Americas, describing the program structure and identifying new implementation strategies that have the potential to improve vaccination coverage in the post-pandemic context, after the challenges COVID-19 presented for more than two years. Results: The Americas currently face a high risk of resurgence of diseases that were previously controlled or eliminated. Therefore, it is important to find new strategies to educate citizens on the risks associated with lower vaccination rates, especially in children. Conclusions: New strategies along with strong mobilization of the population and advocacy by citizens are necessary to prevent antivaccination groups from gaining a stronger presence in the region and jeopardizing the credibility of the Expanded Program on Immunization.

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O objetivo deste estudo foi descrever a cobertura vacinal da BCG, da VIP e da tríplice viral no Brasil, entre os anos de 2010 e 2020. Trata-se de um estudo epidemiológico, descritivo e retrospectivo, com utilização de dados epidemiológicos disponíveis publicamente no Departamento de Informática do Sistema Único de Saúde. Os dados coletados durante o período selecionado foram analisados descritivamente. No Brasil, entre 2010 e 2020, a cobertura vacinal apresentou sua maior taxa anual no ano de 2015 e sua menor taxa em 2016. No que se refere à cobertura vacinal por região do Brasil, a Centro-Oeste obteve a maior taxa geral nos anos estudados. Quanto aos imunobiológicos enfatizados no estudo, é possível observar que as regiões Centro-Oeste e Sul apresentam as maiores taxas. Os valores encontrados nesta pesquisa expressam que houve uma queda da cobertura vacinal a partir de 2016 em todo o território brasileiro, e a maior taxa entre os estados foi a da região Centro-Oeste. Entre os imunobiológicos mencionados nesta pesquisa, observou-se que apenas a BCG e a VIP alcançaram valores acima de 90% no período em estudo, contudo, ambas vem apresentando queda da cobertura nos últimos anos, principalmente no ano de 2020, demonstrando que o atual cenário brasileiro está fora do preconizado.

This study aimed to describe BCG, VIP, and MMR vaccination coverage in Brazil from 2010 to 2020. This epidemiological, descriptive, and retrospective study used epidemiological data publicly available in the Department of Informatics of the Unified Health System. Data collected for the selected period were descriptively analyzed. In Brazil, from 2010 to 2020, national vaccination coverage showed its highest annual rate in 2015 and the lowest rate in 2016. Regarding vaccination coverage by region of Brazil, the Midwest obtained the highest higher overall rate in the studied years. The immunobiologicals emphasized in studies showed that the Midwest and South have the highest rates. The values in this study express a drop in vaccination coverage from 2016 onward throughout the country, with the highest rate among states referring to the Midwest. Among the immunobiological products emphasized in this research, only BCG and VIP reached values above 90% in the studied period, but both have shown a drop in coverage in recent years, especially in the year 2020, evincing that the current Brazilian scenario remains outside recommendations.

El objetivo de este estudio fue describir la cobertura de vacunación de BCG, VIP y triple viral en Brasil, en el período de 2010 a 2020. Este es un estudio epidemiológico, descriptivo y retrospectivo, que utilizó datos epidemiológicos disponibles públicamente en el Departamento de Informática del Sistema Único de Salud. Se analizaron descriptivamente los datos recopilados durante el período seleccionado. En Brasil, entre 2010 y 2020, la cobertura de vacunación presentó la tasa anual más alta en 2015 y la más baja en 2016. En cuanto a la cobertura de vacunación por regiones de Brasil, la región Centro-Oeste obtuvo la tasa general más alta en los años de estudio. Respecto a los inmunobiológicos enfatizados en los estudios, se puede observar que las regiones Centro-Oeste y Sur presentan las tasas más altas. Los valores encontrados en esta investigación muestran un descenso en la cobertura de vacunación a partir de 2016 en todo el país, y la tasa más alta entre los estados se registró en la región Centro-Oeste. Entre los inmunobiológicos destacados en esta investigación, se observó que solo BCG y VIP alcanzaron valores superiores al 90% en el período de estudio, sin embargo, ambos han mostrado un descenso en la cobertura en los últimos años, especialmente el año 2020, lo que demuestra que el escenario brasileño actual está lejos de lo recomendado.

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Objective: Evaluate the implementation of the Ministry of Health's "Action Plan: Border Vaccination Strategy - Agenda 2022" in the Brazil's 33 twin cities and evaluate the increase in the country's vaccination coverage (VC). Methodology: Pre-post community clinical trial. Implementation of the strategy was analyzed, and pre- and post-intervention VC were compared in two stages: P1 (pre-intervention) and P2 (post-intervention). Based on statistical analyses of P1 and P2 coverage, calculations were made of municipal averages, standard deviation, and difference in VC between the two periods. Results: Integration was observed between the primary health care (PHC), surveillance, immunization, and special indigenous health district (DSEI) teams, although there were difficulties, for example, in relation to migratory flows. While immigration flows present challenges in the areas of immunization, PHC, and DSEI, the difficulties are compounded by the polarization of these services, which hinders intersectoral integration. After carrying out the workshops, a total of 50 977 doses were administered in the general population in the 33 twin cities. There was an increase in vaccination coverage in children up to 1 year of age in the locations evaluated after the intervention, which may be relevant in terms of increasing VC in Brazil. Conclusion: There was an increase in vaccination coverage in children up to 1 year of age in the locations evaluated after the intervention, helping to increase VC in Brazil.

Objetivo: Evaluar la aplicación de la Estrategia de Vacunación en las Fronteras - Agenda 2022, que forma parte del Plan de Acción del Ministerio de Salud en las 33 ciudades hermanas y evaluar el aumento de las tasas de cobertura de vacunación en Brasil. Métodos: Ensayo clínico comunitario realizado antes y después de la intervención correspondiente. Se analizó la aplicación de la estrategia y se compararon las tasas de cobertura de vacunación antes y después de la intervención en dos periodos: P1 (pre-intervención) y P2 (post-intervención). En los análisis estadísticos de la tasa de cobertura de vacunación en P1 y P2 se calcularon los valores de media y desviación estándar de los municipios y la diferencia entre las tasas de cobertura de los dos periodos. Resultados: Se observó una integración entre los equipos de Atención Primaria de Salud, Vigilancia, Inmunización y el Distrito Especial de Salud Indígena (DISEI), pero con dificultades, como las inherentes al flujo migratorio. Cabe destacar que el flujo migratorio es uno de los desafíos en el contexto de la inmunización, la atención primaria de salud y el DISEI, dificultad que se ve agravada por la polarización entre los servicios (inmunización, atención primaria de salud y el DISEI), lo que supone un reto para la integración de los sectores. Por lo que respecta al análisis de las tasas de cobertura de vacunación llevado a cabo después de realizar los talleres, se administró un total de 50 977 dosis a la población general en las 33 ciudades hermanas de Brasil. Hubo un aumento de las tasas de cobertura de vacunación de menores de hasta un año de edad en los lugares evaluados después de la intervención, lo que puede ser importante para aumentar las tasas de cobertura de Brasil. Conclusión: Después de la intervención hubo un aumento de las tasas de cobertura de vacunación de menores de hasta un año de edad en los lugares evaluados, lo cual influyó en el incremento de las tasas de cobertura de Brasil.

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Objective: Construct a ranking of national immunization programs in Latin America in 2020 and compare it with the previous year. Methods: Eighteen national immunization programs were evaluated on the basis of public information obtained from official sites of the countries' ministries of health, the World Health Organization, the Pan American Health Organization, the United Nations Children's Fund, and local sources. The ranking was based on the 2020 vaccination schedule for different life stages, special situations, vaccination against influenza, 2019 vaccination coverage, and programmatic aspects. Results: Vaccination coverage decreased in most countries. The average regional declined in 2020, as did the scores for most countries, except Chile and Colombia. Chile leads the ranking, followed by Uruguay, Panama, and Costa Rica. Chile stands out for its full calendar, higher vaccination coverage rates, and programmatic achievements. Conclusions: The lower overall score in 2020 highlights the need to recover the Region's vaccination coverage rates. This analysis seeks to motivate countries to address pending challenges.

Objetivo: Construir e comparar o ranking dos programas nacionais de imunização (PNIs) na América Latina em 2020 com o ano anterior. Métodos: Foram avaliados 18 PNIs com base em informações públicas obtidas de sites oficiais dos ministérios da Saúde dos países, da Organização Mundial da Saúde, da Organização Pan-Americana da Saúde, do Fundo das Nações Unidas para a Infância e de fontes locais. O ranking foi compilado com base no calendário de vacinação de 2020 para diferentes fases da vida, situações especiais, vacinação contra a gripe, cobertura vacinal (CV) de 2019 e aspectos programáticos. Resultados: As CVs diminuíram na maioria dos países. A pontuação média regional e a pontuação da maioria dos países também caíram em 2020, exceto no Chile e na Colômbia. O Chile lidera o ranking, seguido do Uruguai, do Panamá e da Costa Rica, e se destaca por ter um calendário completo, maiores CVs e êxitos programáticos. Conclusões: A pontuação global mais baixa em 2020 destaca a necessidade de recuperar a CV da região. Esta análise busca motivar os países a enfrentar os desafios pendentes.

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The Brazilian National Immunization Program (PNI) has been consolidating itself as one of the most relevant interventions in public health. Paradoxically, great challenges arise for the PNI. The phenomenon of falling vaccine coverage is observed not only in Brazil, but in several countries. In the year 2021, faced with the unfavorable scenario of a drop in vaccination coverage, the State Department of Health, and the Federal University of Minas Gerais joined forces to implement a research-intervention project. This study aimed to evaluate the impact of this intervention on vaccination coverage in children under 2 years of age and on indicators of immunization work processes. This is a community clinical trial carried out in 212 municipalities in the state. Workshops were held and Municipal Action Plans were created. Vaccination coverage data were obtained from the National Immunization Program Information System (SIPNI) and evaluated using the Mann-Whitney U Test and the McNemar Test. Work process indicators were evaluated using the Friedman and Wilcoxon tests. The results demonstrate an important improvement for most of the indicators in the three analyzed times, with statistical significance and an increase in medians and interquartile ranges. Among the indicators that showed the best performance, it is possible to mention those related to the active search by the Community Health Agent. Regarding vaccine coverage, for all immunobiologicals analyzed, there was an increase in the percentage of municipalities that reached targets when comparing the years 2022 and 2021, except for hepatitis A. The intervention research had a positive impact on vaccine coverage of children under 2 years of age and on indicators of immunization work processes in municipalities in the state of Minas Gerais, Brazil.

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RESUMEN Objetivo: Identificar aspectos críticos de la Cadena de Frío en el Perú Metodología: Estudio descriptivo. Se analizaron datos del Ministerio de Economía y Finanzas (MEF) y del Ministerio de Salud (MINSA) de los años 2020-2021, así como los registros administrativos de las Estrategias Sanitarias Regionales de inmunizaciones del MINSA en 2020. Se consideraron aspectos técnicos de la Norma Técnica de Manejo de cadena de frío, como es obsolescencia, dotación, funcionalidad y capacidad de almacenamiento. Resultados: En el año 2020, en términos de obsolescencia el 61.8% de los equipos de cadena de frío a nivel nacional presentaban obsolescencia, siendo regiones claves como Lima Metropolitana (capital del país) la más afectada con un 88%. En cuanto a la dotación de equipos, el 9% de los establecimientos de salud del primer nivel carecen de equipos de refrigeración, siendo Loreto la región con mayor déficit 46%, seguida de Huancavelica con un 21% de brecha. En términos de funcionamiento, se registra que el 84% de los equipos a nivel nacional funcionan, y el 16% reportan fallas técnicas, lo cual representa alto riesgo en la seguridad y potencia inmunogénica de las vacunas a prever. En términos de capacidad, al considerar el almacenamiento trimestral o mensual para las vacunas contra la COVID-19 u otras emergencias sanitarias se identificaron brechas significativas. Conclusiones: Existen riesgos en la operatividad, suministro y capacidad de almacenamiento de las vacunas del esquema nacional de inmunizaciones de Perú incluso ante emergencias sanitarias.

ABSTRACT Objective: The aim of this study was to identify critical aspects of the Cold Chain in the immunization process in Peru. Methodology: A descriptive study was conducted, analyzing data from the Ministry of Economy and Finance (MEF) and the Ministry of Health (MINSA) for the years 2020-2021, as well as administrative records from the MINSA's Regional Health Strategies for immunizations in 2020. Technical aspects established in the Health Technical Standard for Cold Chain Management, such as obsolescence, allocation, functionality, and storage capacity were taken into account. Results: In the year 2020, at the national level, 61.8% of the cold chain equipment showed obsolescence, with some regions exceeding 75%, with Lima's metropolitan region being the most affected at 88%. Concerning equipment allocation, 9% of the first-level health facilities lacked refrigeration equipment, with Loreto having the highest deficit (46%), followed by Huancavelica with a 21% gap. The overall equipment functionality nationwide was 84%, meaning that 16% of health facilities experienced technical failures, affecting vaccine's storage capacity and posing risks to their safety and immunogenicity. Significant gaps were identified when considering quarterly or monthly storage for COVID-19 vaccines or other health emergencies. Conclusions: This study highlights potential risks in the operability and storage capacity of the national immunization program's vaccines in Peru during contingencies such as the COVID-19 pandemic or other health emergencies.