Using a Test-Negative Case-Control Analysis, Dr Margaret L. Lind and colleagues, investigate the association between primary or booster COVID-19 mRNA vaccination and omicron lineage BA.1 SARS-CoV-2 infection in people with a prior SARS-CoV-2 infection.
Using a Test-Negative Case-Control Analysis, Dr Margaret L. Lind and colleagues, investigate the association between primary or booster COVID-19 mRNA vaccination and omicron lineage BA.1 SARS-CoV-2 infection in people with a prior SARS-CoV-2 infection.
This modeling study estimates the excess deaths attributable to COVID-19 disease in Massachusetts during the Delta (June to December 2021) and Omicron (December