Breakthrough infections with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-
2) in fully vaccinated individuals are receiving intense scrutiny because of their importance …

Background The global effort to vaccinate people against severe acute respiratory syndrome
coronavirus 2 (SARS-CoV-2) during an ongoing pandemic has raised questions about how …

Waning vaccine-induced immunity coupled with the emergence of SARS-CoV-2 variants
has led to increases in breakthrough infections, prompting consideration for vaccine booster …

Importance Data are limited on whether patients with breakthrough COVID-19 infection have
the potential to significantly contribute to the spread of SARS-CoV-2. Objective To compare …

Associations between vaccine breakthrough cases and infection by different SARS
coronavirus 2 (SARS-CoV-2) variants have remained largely unexplored. Here we analysed …

SARS-CoV-2 variants of concern have continuously evolved and may erode vaccine
induced immunity. In this observational cohort study, we determine the risk of breakthrough …

Recent studies have provided key information about SARS-CoV-2 vaccines' efficacy and
effectiveness (VE). One important question that remains is whether the protection conferred …

SARS-CoV-2 breakthrough infections in vaccinated individuals and in those who had a prior
infection have been observed globally, but the transmission potential of these infections is …

INTRODUCTION As the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
pandemic continues, the deployment of safe and effective vaccines presents a key …

Background With the surge of new SARS-CoV-2 variants, countries have begun offering
COVID-19 vaccine booster doses to high-risk groups and, more recently, to the adult …