From the Document: "During 2021, various federal, state [hyperlink], and private [hyperlink] entities instituted Coronavirus Disease 2019 (COVID-19) vaccination requirements to address the pandemic, particularly as the Delta variant [hyperlink]--a highly contagious strain of SARS-CoV-2 [severe acute respiratory syndrome coronavirus 2] (the virus that causes COVID-19)--spread in the United States. The federal COVID-19 vaccination requirements issued to date by the President or executive agencies include those directed at (1) federal executive agency civilian employees [hyperlink] (federal employee mandate); (2) federal contractors for executive departments, agencies, and offices [hyperlink] (federal contractor mandate); (3) most Medicare- and Medicaid-certified providers and suppliers [hyperlink] (Centers for Medicare and Medicaid Services' [CMS'] Medicare/Medicaid provider mandate); and (4) employers with 100 or more employees [hyperlink] (Occupational Safety and Health Administration's [OSHA's] large employer vaccination and testing mandate). These employment- or workforce-based mandates--subject to accommodations required by federal law--either directly require certain employees to receive COVID-19 vaccinations or direct certain employers to impose a vaccination or vaccination-and-testing requirement on their employees or staff. These federal vaccination mandates have generated numerous legal challenges that have moved quickly through the courts. To date, some of these mandates have been enjoined by courts either on a nationwide basis or only in certain states."
CRS Legal Sidebar, LSB10681
Congressional Research Service: https://crsreports.congress.gov/