Genomic and eco-epidemiological investigations in Uruguay reveal local Chikungunya virus transmission dynamics during its expansion across the Americas in 2023.

Uruguay experienced its first Chikungunya virus outbreak in 2023, resulting in a significant burden to its healthcare system. We conducted analysis based on real-time genomic surveillance (30 novel whole genomes) to offer timely insights into recent local transmission dynamics and eco-epidemiological factors behind its emergence and spread in the country.

Evidence of Ongoing Transmission of Zika Virus in Mérida, Mexico.

Since the Zika virus (ZIKV) pandemic in 2015-2017, there has been a near absence of reported cases in the Americas outside of Brazil. However, the conditions for Aedes-borne transmission persist in Latin America, and the threat of ZIKV transmission is increasing as population immunity wanes. Mexico has reported only 70 cases of laboratory-confirmed ZIKV infection since 2020, with no cases recorded in the Yucatán peninsula. Here, we provide evidence of active ZIKV transmission, despite the absence of official case reports, in the city of Mérida, Mexico, the capital of the state of Yucatán. Capitalizing on an existing cohort, we detected cases in participants with symptoms consistent with flavivirus infection from 2021 to 2022. Serum samples from suspected cases were tested for ZIKV RNA by polymerase chain reaction or ZIKV-reactive IgM by ELISA. To provide more specific evidence of exposure, focus reduction neutralization tests were performed on ELISA-positive samples. Overall, we observed 25 suspected ZIKV infections for an estimated incidence of 2.8 symptomatic cases per 1,000 persons per year. Our findings emphasize the continuing threat of ZIKV transmission in the setting of decreased surveillance and reporting.

Atualização epidemiológica: circulação do SARS-CoV-2 e de outros vírus respiratórios nas Américas

A Organização Pan-Americana da Saúde (OPAS) publicou esta semana uma atualização epidemiológica sobre os vírus respiratórios na Região das Américas. A atualização fornece recomendações para manter a vigilância desses vírus e fortalecer a resposta dos sistemas de saúde, especialmente devido aos atuais surtos de outras doenças transmissíveis.

Non-pharmaceutical interventions to combat COVID-19 in the Americas described through daily sub-national data.

This dataset covers national and subnational non-pharmaceutical interventions (NPI) to combat the COVID-19 pandemic in the Americas. Prior to the development of a vaccine, NPI were governments' primary tools to mitigate the spread of COVID-19. Variation in subnational responses to COVID-19 is high and is salient for health outcomes. This dataset captures governments' dynamic, varied NPI to combat COVID-19 for 80% of Latin America's population from each country's first case through December 2021. These daily data encompass all national and subnational units in Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Mexico, and Peru. The dataset includes individual and aggregate indices of nine NPI: school closures, work suspensions, public event cancellations, public transport suspensions, information campaigns, local travel restrictions, international travel controls, stay-at-home orders, and restrictions on the size of gatherings. We also collected data on mask mandates as a separate indicator. Local country-teams drew from multiple data sources, resulting in high-quality, reliable data. The dataset thus allows for consistent, meaningful comparisons of NPI within and across countries during the pandemic.

À medida que os casos de dengue aumentam globalmente, o controle de vetores e o envolvimento da comunidade são fundamentais para evitar a disseminação da doença

Enquanto a incidência de dengue aumenta em todas as regiões, especialmente em partes das Américas, especialistas analisaram esta semana a situação global e os métodos para ajudar a controlar a propagação da doença transmitida por mosquitos.

Tackling mosquito-borne viruses in the Region of the Americas.

The spread of mosquito-borne diseases in the Region of the Americas is focusing attention on an innovative approach to vector control. Gary Humphreys reports.

Analyses of Early ZIKV Genomes Are Consistent with Viral Spread from Northeast Brazil to the Americas.

The Americas, particularly Brazil, were greatly impacted by the widespread Zika virus (ZIKV) outbreak in 2015 and 2016. Efforts were made to implement genomic surveillance of ZIKV as part of the public health responses. The accuracy of spatiotemporal reconstructions of the epidemic spread relies on the unbiased sampling of the transmission process. In the early stages of the outbreak, we recruited patients exhibiting clinical symptoms of arbovirus-like infection from Salvador and Campo Formoso, Bahia, in Northeast Brazil. Between May 2015 and June 2016, we identified 21 cases of acute ZIKV infection and subsequently recovered 14 near full-length sequences using the amplicon tiling multiplex approach with nanopore sequencing. We performed a time-calibrated discrete phylogeographic analysis to trace the spread and migration history of the ZIKV. Our phylogenetic analysis supports a consistent relationship between ZIKV migration from Northeast to Southeast Brazil and its subsequent dissemination beyond Brazil. Additionally, our analysis provides insights into the migration of ZIKV from Brazil to Haiti and the role Brazil played in the spread of ZIKV to other countries, such as Singapore, the USA, and the Dominican Republic. The data generated by this study enhances our understanding of ZIKV dynamics and supports the existing knowledge, which can aid in future surveillance efforts against the virus.

Scenarios of maternal mortality reduction by 2030 in the Americas: insights from its tempo.

BACKGROUND: The enduring threat of maternal mortality to health worldwide and in the Americas has been recognized in the global and regional agendas and their targets to 2030. To inform the direction and amount of effort needed to meet those targets, a set of equity-sensitive regional scenarios of maternal mortality ratio (MMR) reduction based on its tempo or speed of change from baseline year 2015 was developed. METHODS: Regional scenarios by 2030 were defined according to: i) the MMR average annual rate of reduction (AARR) needed to meet the global (70 per 100,000) or regional (30 per 100,000) targets and, ii) the horizontal (proportional) or vertical (progressive) equity criterion applied to the cross-country AARR distribution (i.e., same speed to all countries or faster for those with higher baseline MMR). MMR average and inequality gaps -absolute (AIG), and relative (RIG)- were scenario outcomes. RESULTS: At baseline, MMR was 59.2 per 100,000; AIG was 313.4 per 100,000 and RIG was 19.0 between countries with baseline MMR over twice the global target and those below the regional target. The AARR needed to meet the global and regional targets were -7.60% and -4.54%, respectively; baseline AARR was -1.55%. In the regional MMR target attainment scenario, applying horizontal equity would decrease AIG to 158.7 per 100,000 and RIG will remain invariant; applying vertical equity would decrease AIG to 130.9 per 100,000 and RIG would decrease to 13.5 by 2030. CONCLUSION: The dual challenge of reducing maternal mortality and abating its inequalities will demand hefty efforts from countries of the Americas. This remains true to their collective 2030 MMR target while leaving no one behind. These efforts should be mainly directed towards significantly speeding up the tempo of the MMR reduction and applying sensible progressivity, targeting on groups and territories with higher MMR and greater social vulnerabilities, especially in a post-pandemic regional context.

Seasonal influenza vaccination in the Americas: Progress and challenges during the COVID-19 pandemic.

BACKGROUND: Vaccination is one of the most effective measures to prevent influenza illness and its complications; influenza vaccination remained important during the COVID-19 pandemic to prevent additional burden on health systems strained by COVID-19 demand. OBJECTIVES: We describe policies, coverage, and progress of seasonal influenza vaccination programs in the Americas during 2019-2021 and discuss challenges in monitoring and maintaining influenza vaccination coverage among target groups during the COVID-19 pandemic. METHODS: We used data on influenza vaccination policies and vaccination coverage reported by countries/territories via the electronic Joint Reporting Form on Immunization (eJRF) for 2019-2021. We also summarized country vaccination strategies shared with PAHO. RESULTS: As of 2021, 39 (89 %) out of 44 reporting countries/territories in the Americas had policies for seasonal influenza vaccination. Countries/territories adapted health services and immunization delivery strategies using innovative approaches, such as new vaccination sites and expanded schedules, to ensure continuation of influenza vaccination during the COVID-19 pandemic. However, among countries/territories that reported data to eJRF in both 2019 and 2021, median coverage decreased; the percentage point decrease was 21 % (IQR = 0-38 %; n = 13) for healthcare workers, 10 % (IQR = -1.5-38 %; n = 12) for older adults, 21 % (IQR = 5-31 %; n = 13) for pregnant women, 13 % (IQR = 4.8-20.8 %; n = 8) for persons with chronic diseases, and 9 % (IQR = 3-27 %; n = 15) for children. CONCLUSIONS: Countries/territories in the Americas successfully adapted influenza vaccination delivery to continue vaccination services during the COVID-19 pandemic; however, reported influenza vaccination coverage decreased from 2019 to 2021. Reversing declines in vaccination will necessitate strategic approaches that prioritize sustainable vaccination programs across the life course. Efforts should be made to improve the completeness and quality of administrative coverage data. Lessons learned from COVID-19 vaccination, such as the rapid development of electronic vaccination registries and digital certificates, might facilitate advances in coverage estimation.

Evolutionary analysis of JC polyomavirus in Misiones' population yields insight into the population dynamics of the early human dispersal in the Americas.

BACKGROUND: JC polyomavirus (JCV) has an ethno-geographical distribution across human populations. OBJECTIVE: Study the origins of the population of Misiones (Argentina) by using JCV as genetic marker. METHODS: Viral detection and characterization was conducted by PCR amplification and evolutionary analysis of the intergenic region sequences. RESULTS: 22 out of 121 samples were positive for JCV, including 5 viral lineages: MY (n = 8), Eu-a (n = 7), B1-c (n = 4), B1-b (n = 2) and Af2 (n = 1). MY sequences clustered within a branch of Native American origin that diverged from its Asian counterpart about 21,914 years ago (HPD 95% interval 15,383-30,177), followed by a sustained demographic expansion around 5000 years ago. CONCLUSIONS: JCV in Misiones reflects the multiethnic origin of the current population, with an important Amerindian contribution. Analysis of the MY viral lineage shows a pattern consistent with the arrival of early human migrations to the Americas and a population expansion by the pre-Columbian native societies.

Com o aumento de casos, especialistas analisam a propagação da Chikungunya nas Américas

Com o número de casos de chikungunya na região das Américas ultrapassando 210 mil nos primeiros meses de 2023, especialistas revisaram, em um webinar nesta semana, métodos para controlar o vetor da doença, fatores que facilitam sua disseminação e suporte aos países para lidar com um número crescente de casos.

Risco de surto de doenças preveníveis por vacinação é o mais alto em 30 anos, diz diretor da OPAS

O diretor da Organização Pan-Americana da Saúde (OPAS), Jarbas Barbosa, convoca os países a intensificarem urgentemente os programas de vacinação, já que o risco de surtos de doenças nas Américas atinge o nível mais alto em 30 anos devido a queda na cobertura vacinal.

OPAS atualiza informações sobre a situação do poliovírus nas Américas

A Organização Pan-Americana da Saúde (OPAS) divulgou uma nova atualização epidemiológica resumindo a situação regional do vírus que causa a poliomielite e fornecendo informações sobre o caso recentemente relatado de poliovírus derivado da vacina no Peru.

[Paying attention to the epidemic of group A Streptococcus infections in multiple European and American countries]. / å ³æ³¨æ¬§ç¾Žå¤šå›½Aæ—é“¾çƒèŒæ„ŸæŸ“ç–«æƒ .

At the end of 2022, the World Health Organization reported an increase in group A Streptococcus (GAS) infections, such as scarlet fever, in multiple countries. The outbreak primarily affected children under 10 years old, and the number of deaths was higher than anticipated, causing international concern. This paper reviews the current state of the GAS disease outbreak, its causes, and response measures. The authors aim to draw attention from clinical workers in China and increase their awareness and vigilance regarding this epidemic. Healthcare workers should be aware of the potential epidemiological changes in infectious diseases that may arise after the optimization of control measures for coronavirus disease 2019 to ensure children's health.

Inequalities in Violent Death across Income Levels among Young Males and Females in Countries of the Americas.

BACKGROUND: Violent deaths (i.e., those due to road traffic injury, homicide, and suicide) are among the most important causes of premature and preventable mortality in young people. This study aimed at exploring inequalities in violent death across income levels between males and females aged 10 to 24 years from the Americas in 2015, the SDG baseline year. METHODS: In a cross-sectional ecological study design, eleven standard summary measures of health inequality were calculated separately for males and females and for each cause of violent death, using age-adjusted mortality rates and average income per capita for 17 countries, which accounted for 87.9% of the target population. RESULTS: Premature mortality due to road traffic injury and homicide showed a pro-poor inequality pattern, whereas premature mortality due to suicide showed a pro-rich inequality pattern. These inequalities were statistically significant (p < 0.001), particularly concentrated among young males, and dominated by homicide. The ample array of summary measures of health inequality tended to generate convergent results. CONCLUSIONS: Significant inequalities in violent death among young people seems to be in place across countries of the Americas, and they seem to be socially determined by both income and gender. These findings shed light on the epidemiology of violent death in young people and can inform priorities for regional public health action. However, further investigation is needed to confirm inequality patterns and to explore underlying mechanisms, age- and sex-specific vulnerabilities, and gender-based drivers of such inequalities.

Após três anos de COVID-19, vigilância e vacinação são a chave para acabar com a pandemia nas Américas

À medida que a pandemia da COVID-19 entra em seu terceiro ano na Região das Américas, o diretor da Organização Pan-Americana da Saúde (OPAS), Jarbas Barbosa, pediu aos países que fortaleçam a vigilância e reduzam as lacunas na cobertura vacinal para acabar com a emergência e se preparar melhor para futuras crises de saúde.

Lessons learned from the implementation of integrated serosurveillance of communicable diseases in the Americas / Enseñanzas obtenidas en la aplicación de la serovigilancia integrada de las enfermedades transmisibles en la Región de las Américas / Lições aprendidas com a implementação da vigilância sorológica integrada de doenças transmissíveis nas Américas

ABSTRACT Objective. Systematize the experience and identify challenges and lessons learned in the implementation of an initiative for integrated serosurveillance of communicable diseases using a multiplex bead assay in countries of the Americas. Methods. Documents produced in the initiative were compiled and reviewed. These included concept notes, internal working papers, regional meetings reports, and survey protocols from the three participating countries (Mexico, Paraguay, and Brazil) and two additional countries (Guyana and Guatemala) where serology for several communicable diseases was included in neglected tropical diseases surveys. Information was extracted and summarized to describe the experience and the most relevant challenges and lessons learned. Results. Implementing integrated serosurveys requires interprogrammatic and interdisciplinary work teams for the design of survey protocols to respond to key programmatic questions aligned to the needs of the countries. Valid laboratory results are critical and rely on the standardized installment and roll-out of laboratory techniques. Field teams require adequate training and supervision to properly implement survey procedures. The analysis and interpretation of serosurveys results should be antigen-specific, contextualizing the responses for each disease, and triangulated with programmatic and epidemiological data for making decisions tailored to specific population socioeconomic and ecologic contexts. Conclusions. Integrated serosurveillance as a complementary tool for functional epidemiological surveillance systems is feasible to use and key components should be considered: political engagement, technical engagement, and integrated planning. Aspects such as designing the protocol, selecting target populations and diseases, laboratory capacities, anticipating the capacities to analyze and interpret complex data, and how to use it are key.

Resumen Objetivo. Sistematizar la experiencia y determinar los desafíos y las enseñanzas obtenidas durante la aplicación de una iniciativa de serovigilancia integrada de enfermedades transmisibles mediante un ensayo de perlas múltiples en países de la Región de las Américas. Métodos. Se recopilaron y revisaron los documentos generados en el marco de la iniciativa. Estos incluían notas conceptuales, documentos de trabajo internos, informes de reuniones regionales y protocolos de encuesta de los tres países participantes (Brasil, México y Paraguay) y otros dos países (Guatemala y Guyana) donde en las encuestas sobre enfermedades tropicales desatendidas también se incluía la serología para varias enfermedades transmisibles. Se recabó y resumió la información para describir tanto la experiencia como los desafíos y las enseñanzas de mayor relevancia. Resultados. La realización de encuestas serológicas integradas requiere equipos de trabajo interprogramáticos e interdisciplinarios para la elaboración de protocolos de encuesta que permitan responder a cuestiones programáticas fundamentales y ajustadas a las necesidades de los países. Es imprescindible contar con resultados de laboratorio válidos, para lo que es preciso que sus técnicas e instalaciones estén estandarizadas. Para que los equipos de campo puedan ejecutar correctamente los procedimientos de la encuesta, deben contar con una formación y supervisión adecuadas. El análisis y la interpretación de los resultados de las encuestas serológicas deben ser específicos para cada antígeno, situar las respuestas en el contexto de cada enfermedad y triangularse con los datos programáticos y epidemiológicos para tomar decisiones adaptadas a los contextos socioeconómicos y ecológicos específicos de la población. Conclusiones. Es uso de la vigilancia serológica integrada como una herramienta complementaria en los sistemas funcionales de vigilancia epidemiológica es algo posible; para esto deben tenerse en cuenta ciertos elementos fundamentales: el compromiso político, el compromiso técnico y la planificación integrada. A tal efecto, son fundamentales ciertos elementos como el diseño del protocolo, la selección de los grupos poblacionales y las enfermedades objetivo, la capacidad de los laboratorios, y la previsión de las capacidades de análisis e interpretación de datos complejos y la forma de utilizarlos.

RESUMO Objetivo. Sistematizar a experiência e identificar desafios e lições aprendidas na implementação de uma iniciativa de vigilância sorológica integrada de doenças transmissíveis, usando ensaio de micro-esferas multiplex em países das Américas. Métodos. Os documentos produzidos na iniciativa foram compilados e examinados, e incluíram notas conceituais, documentos internos de trabalho, relatórios de reuniões regionais e protocolos de pesquisa dos três países participantes (México, Paraguai e Brasil) e de dois países adicionais (Guiana e Guatemala), onde a vigilância sorológica de várias doenças transmissíveis foi incluída em pesquisas sobre doenças tropicais negligenciadas. As informações foram extraídas e resumidas para descrever a experiência e os desafios e as lições aprendidas mais relevantes. Resultados. A implementação de inquéritos sorológicos integrados requer equipes de trabalho interprogramáticas e interdisciplinares para o delineamento de protocolos que respondam a questões programáticas chave, alinhadas com as necessidades dos países. Resultados laboratoriais válidos são essenciais, e dependem da instalação e implantação padronizadas de técnicas laboratoriais. As equipes de campo precisam de treinamento e supervisão apropriados para implementar adequadamente os procedimentos de pesquisa. A análise e a interpretação dos resultados dos inquéritos sorológicos devem ser antígeno-específicas, contextualizando as respostas para cada doença, e trianguladas com dados programáticos e epidemiológicos para a tomada de decisões adaptadas aos contextos socioeconômicos e ecológicos específicos de cada população. Conclusões. A vigilância sorológica integrada como ferramenta complementar para sistemas de vigilância epidemiológica funcionais é viável. Os componentes-chave a seguir devem ser considerados: engajamento político, engajamento técnico e planejamento integrado. Aspectos como o delineamento do protocolo, a seleção de populações-alvo e doenças-alvo, a capacidade laboratorial, a previsão das capacidades para análise e interpretação de dados complexos e como usá-los são fundamentais.

COVID-19 in the Americas: the role of collaborating centers in understanding lessons and best practices in pandemic preparedness and response / COVID-19 en la Región de las Américas: papel de los centros colaboradores en la comprensión de las enseñanzas y mejores prácticas en la preparación y respuesta frente a pandemias / COVID-19 nas Américas: o papel dos centros colaboradores para entender as lições e melhores práticas de preparação e resposta a pandemias

ABSTRACT COVID-19 exposed major gaps in global, regional, state, and local responses to public health emergencies. In preparation for the WHA Special Session to consider the benefits of developing an international instrument on pandemic preparedness, the O'Neill Institute in partnership with Foundation for the National Institutes of Health convened 30 of the world's leading authorities on global health law, financing, biomedical science, implementation, and emergency response along with leaders from prominent international organizations. This meeting was followed by regional consultations convened in Latin America-Caribbean, Africa, and Southeast Asia. These high-level expert consultations generated in-depth discussions on weaknesses and persisting gaps in global pandemic preparedness and what a new international agreement might include to address them. Regional intergovernmental organizations like PAHO can work closely with related multilateral development banks to develop financial instruments that can smooth systemic economic disruption; and regional centers of research and manufacturing excellence can offer a strong front line for producing medicines and vaccines rapidly during a pandemic. With our research focused on the regional response to COVID-19 we are able to look at country responses individually and collectively to see how Latin America - Caribbean countries can capitalize and leverage their regional connections to strengthen their pandemic preparedness and response. By identifying existing gaps and examining the responses and approaches taken by PAHO, we can better understand the role of international and regional organizations and their collaborating centers in preparing and responding to pandemics.

RESUMEN La COVID-19 expuso grandes brechas en las respuestas locales, nacionales, regionales y mundiales a las emergencias de salud pública. En preparación para la reunión extraordinaria de la Asamblea Mundial de la Salud para considerar los beneficios de elaborar un instrumento internacional sobre la preparación frente a las pandemias, el Instituto O'Neill, en colaboración con la Fundación para los Institutos Nacionales de Salud, convocó a 30 de las principales autoridades mundiales en materia de derecho, financiamiento, ciencia biomédica, implementación y respuesta a emergencias de salud, así como a líderes de organizaciones internacionales prominentes. A esta reunión le siguieron consultas regionales convocadas en América Latina y el Caribe, África y el sudeste asiático. Estas consultas con expertos de alto nivel generaron debates en profundidad acerca de las debilidades y brechas persistentes en la preparación frente a las pandemias y qué podría incluirse en un nuevo acuerdo internacional sobre cómo abordarlas. Las organizaciones intergubernamentales regionales como la Organización Panamericana de la Salud pueden trabajar en estrecha colaboración con los bancos multilaterales de desarrollo relacionados para elaborar instrumentos financieros que puedan aliviar las perturbaciones económicas sistémicas; y los centros regionales de excelencia en investigación y producción pueden formar una sólida primera línea de acción para producir medicamentos y vacunas rápidamente durante una pandemia. Con esta investigación centrada en la respuesta regional a la COVID-19, podemos analizar las respuestas de los países de forma individual y colectiva para observar la manera en que América Latina y el Caribe pueden capitalizar y aprovechar sus conexiones regionales para fortalecer su preparación y respuesta frente a una pandemia. Al determinar cuáles son las brechas existentes y examinar las respuestas y los enfoques adoptados por la OPS, podemos comprender mejor el papel de las organizaciones regionales e internacionales y sus centros colaboradores en la preparación y respuesta frente a las pandemias.

RESUMO A COVID-19 expôs grandes lacunas nas respostas globais, regionais, estaduais e locais a emergências de saúde pública. Nos preparativos para a Sessão Especial da Assembleia Mundial da Saúde para avaliar os benefícios de desenvolver um instrumento internacional de preparação para pandemias, o Instituto O'Neill, em parceria com a Fundação para os Institutos Nacionais de Saúde, reuniu 30 das principais autoridades mundiais em direito sanitário global, financiamento, ciências biomédicas, implementação e resposta a emergências, além de líderes de organizações internacionais proeminentes. Essa reunião foi seguida por consultas regionais convocadas na América Latina/Caribe, na África e no sudeste da Ásia. Essas consultas com especialistas de alto nível geraram discussões minuciosas sobre os pontos fracos e as lacunas persistentes na preparação global para pandemias e o que poderia ser incluído em um novo acordo internacional para resolvê-los. Organizações intergovernamentais regionais, como a OPAS, podem trabalhar em estreita colaboração com os bancos multilaterais de desenvolvimento para desenvolver instrumentos financeiros capazes de atenuar a ruptura econômica sistêmica; por outro lado, centros regionais de excelência em pesquisa e fabricação podem oferecer uma linha de frente expressiva para a rápida produção de medicamentos e vacinas durante uma pandemia. Usando os dados da nossa pesquisa sobre a resposta regional à COVID-19, podemos analisar as respostas dos países de forma individual e coletiva para avaliar como os países da América Latina e do Caribe podem capitalizar e alavancar suas conexões regionais para fortalecer sua preparação e resposta à pandemia. Ao identificar lacunas existentes e analisar as respostas e abordagens adotadas pela OPAS, podemos compreender melhor o papel das organizações internacionais e regionais e de seus centros colaboradores na preparação e resposta a pandemias.