The Department of Homeland Security (DHS) has issued an advisory stating that the United States remains in a "heightened threat environment" with "lone offenders and small groups motivated by a range of ideological beliefs and personal grievances" posing a significant risk.
A new document from the Food and Drug Administration (FDA) stated the FDA does not "require demonstration of the prevention of infection or transmission" in order to authorize a vaccine.
2021 filings reveal Pfizer had reason to believe its COVID-19 vaccine's effectiveness waned, although the company did not choose to release the information until months after the revelation.