The U.S. Occupational Safety and Health Administration (OSHA) issued its long-awaited Emergency Temporary Standard (ETS) requiring employers with 100 or more employees to ensure that their employees are either fully vaccinated against COVID-19 or are tested on a weekly basis.  This ETS compliments previous efforts by the federal government to address the COVID-19 pandemic, including Executive Orders requiring federal contractors and federal employees to be vaccinated, and regulations issued by the Centers for Medicare and Medicaid Services (CMS) requiring vaccination for employees of health care facilities. Legal Challenges Legal challenges opposing the ETS have already been filed in various U.S. …