We extracted one-year genomic data (August 2020–July 2021) from GISAID EpiCoV™
database and estimated monthly proportions of 11 SARS-CoV-2 variants in various …

COVID-19 resulted in extensive morbidity and mortality worldwide. SARS-CoV-2 evolved
rapidly, with increasing transmission due to Variants of Concern (VOC). Identifying VOC …

SARS-CoV-2 genome surveillance is important for monitoring risk groups and health
workers as well as data on new cases and mortality rate due to COVID-19. We characterized …

Brazil is the country with the second-largest number of deaths due to the coronavirus
disease-2019 (COVID-19). Two variants of concern (VOCs), Alpha (B. 1.1. 7) and Gamma …

Simple Summary SARS-CoV-2 is characterized by extensive genetic divergence. The
emergence of the variant of concern (VOC) Omicron, due to its characteristics, has caused …

From a country with one of the highest SARS-CoV-2 morbidity and mortality rates, Brazil has
implemented one of the most successful vaccination programs. Brazil's first model city …

The variant of concern (VOC) SARS-CoV-2 Omicron (B. 1.1529) has been described as a
highly contagious variant but less virulent than the current variant being monitored (VBM) …

Introduction A characteristic of the COVID-19 pandemic has been the sequential emergence
and global dissemination of SARS-CoV-2 variants, noted for their enhanced transmission …

Abstract Background In December 2021, the SARS-CoV-2 Omicron variant displaced the
Delta variant and caused an unprecedented spike in the numbers of COVID-19 cases. This …

We examined the asymptomatic rates of SARS-CoV-2 infection during the Delta and
Omicron waves in the city of São Paulo. Nasopharyngeal swabs were collected at strategic …