Further reading:
https://www.mwe.com/insights/osha-releases-guidance-for-employers-considering-vaccine-requirements/
https://www.jdsupra.com/legalnews/osha-releases-guidance-for-employers-4440786/
https://www.osha.gov/coronavirus/faqs
https://www.osha.gov/laws-regs/regulations/standardnumber/1904