Emerging variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are of
clinical concern. In a cohort of 417 persons who had received the second dose of BNT162b2 …

The efficacy of COVID-19 mRNA vaccines is high, but breakthrough infections still occur. We
compared the SARS-CoV-2 genomes of 76 breakthrough cases after full vaccination with …

Vaccine breakthrough SARS-CoV-2 infection has been monitored in 3720 healthcare
workers receiving 2 doses of BNT162b2. SARS-CoV-2 infection is detected in 33 subjects …

Background This study aims to identify the causative strain of SARS-CoV-2 in a cluster of
vaccine breakthroughs. Vaccine breakthrough by a highly transmissible SARS-CoV-2 strain …

To the Editor: The article by Hacisuleyman et al.(published online on April 21) 1 reinforces
concerns about SARS-CoV-2 variants and vaccine breakthrough. The authors describe two …

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

On January 10, 2020, the first genomic sequence of the severe acute respiratory syndrome
coronavirus 2 (SARS-CoV-2) isolated from a patient in Wuhan, China, was posted online. As …

The surge of COVID-19 infections has been fueled by new SARS-CoV-2 variants, namely
Alpha, Beta, Gamma, Delta, and so forth. The molecular mechanism underlying such surge …

Objectives Highly effective vaccines against severe acute respiratory syndrome coronavirus
2 (SARS-CoV-2) have been developed but variants of concerns are worrisome, especially B …

In this issue of JAMA, Zhang and colleagues1 report the emergence of a novel severe acute
respiratory syndrome coronavirus 2 (SARS-CoV-2) variant in Southern California that …