The Occupational Safety & Health Administration issued an "emergency temporary standard to protect unvaccinated employees of large employers (100 or more employees) from the risk of contracting COVID-19 by strongly encouraging vaccination. Covered employers must develop, implement, and enforce a mandatory COVID-19 vaccination policy, with an exception for employers that instead adopt a policy requiring employees to either get vaccinated or elect to undergo regular COVID-19 testing and wear a face covering at work in lieu of vaccination."

CDC: Resuming Global Travel -- Airline Passenger & Crew Requirements -- Negative Pre-Departure Test Result -- Advisory Committee on Immunization

CMS: Health Care Staff Vaccination & Reporting Requirements for Long-Term Care Facilities