Emerging evidence supports a link between environmental factors—including air pollution
and chemical exposures, climate, and the built environment—and severe acute respiratory …

The worldwide battle against the SARS-CoV-2 virus rages on, with millions infected and
many innocent lives lost. The causative organism, severe acute respiratory syndrome …

Summary Background The SARS-CoV-2 delta (B. 1.617. 2) variant is highly transmissible
and spreading globally, including in populations with high vaccination rates. We aimed to …

INTRODUCTION Although post facto studies have revealed the importance of severe acute
respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission from presymptomatic …

The emergence of SARS-CoV-2 variants of concern suggests viral adaptation to enhance
human-to-human transmission,. Although much effort has focused on the characterization of …

The northern state of Amazonas is among the regions in Brazil most heavily affected by the
COVID-19 epidemic and has experienced two exponentially growing waves, in early and …

INTRODUCTION Several novel variants of severe acute respiratory syndrome coronavirus 2
(SARS-CoV-2), the virus that causes COVID-19, emerged in late 2020. One of these, Variant …

Summary Background The SARS-CoV-2 variant B. 1.1. 7 was first identified in December,
2020, in England. We aimed to investigate whether increases in the proportion of infections …

A novel SARS-CoV-2 variant, VOC 202012/01, emerged in southeast England in November
2020 and is rapidly spreading towards fixation. Using a variety of statistical and dynamic …

There is ample evidence that masking and social distancing are effective in reducing severe
acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission. However, due to the …