In late 2020, after circulating for almost a year in the human population, severe acute
respiratory syndrome coronavirus 2 (SARS-CoV-2) exhibited a major step change in its …

Objectives To compare severity and clinical outcomes from Omicron as compared with the
Delta variant and to compare outcomes between Omicron sublineages. Methods We …

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) breakthrough infections in
vaccinated individuals and reinfections in previously infected individuals have become …

Many studies have used mobile device location data to model SARS-CoV-2 dynamics, yet
relationships between mobility behavior and endemic respiratory pathogens are less …

During the COVID-19 pandemic, sizeable groups of unvaccinated people persist even in
countries with high vaccine access. As a consequence, vaccination became a controversial …

The massive scale of the global SARS-CoV-2 sequencing effort created new opportunities
and challenges for understanding SARS-CoV-2 evolution. Rapid detection and assessment …

Importance Evidence of the efficacy and safety of messenger RNA (mRNA) COVID-19
vaccines in children aged 5 to 11 years has been emerging. Collecting these data will inform …

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern (VOCs)
now arise in the context of heterogeneous human connectivity and population immunity …

The immunity conferred by SARS-CoV-2 vaccines and infections reduces the transmission
of the virus. To answer how the effect of immunity is shared between a reduction of …

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron variant (B.
1.1. 529) rapidly replaced Delta (B. 1.617. 2) to become dominant in England. Our study …