Background It has been claimed that COVID-19 vaccination is associated with excess
mortality during the COVID-19 pandemic, a claim that contributes to vaccine hesitancy. We …

Background Chronic social and health inequities faced by indigenous peoples in Brazil
foretell the detrimental impact of COVID-19. Methods We use de-identified, publicly …

Introduction During a pandemic, there are many situations in which the first available
vaccines may not have as high effectiveness as vaccines that are still under development or …

During rollout of coronavirus disease vaccination, policymakers have faced critical trade-
offs. Using a mathematical model of transmission, we found that timing of vaccination rollout …

Background COVID-19 continues to impose significant morbidity and mortality in Japan
even after implementing the vaccination program. It would remain elusive if restrictions for its …

During the COVID-19 pandemic, recommendations for maintaining physical distance,
restricted mobility measures, as well as fear of mass transmission by going to health centers …

Background: Currently, Colombia is carrying out the National Vaccination Plan against
COVID-19. Clinical trials of vaccines used in the country have a high efficacy and safety, but …

INTRODUCTION: In 2019, the proliferation of a virus identified as SARS-CoV-2 emerged in
the city of Wuhan, a district in China, quickly spread throughout the world, gaining pandemic …

SUMMARY INTRODUCTION: The rapid advance of Coronavirus disease 2019 (Covid-19)
has led to the incessant search for therapeutic and prophylactic measures to fight the …

Introduction Different COVID-19 vaccine efficacies are reported, with remarkable
effectiveness against severe disease. The so called sterilizing immunity, occurring when …