Can a supervisor or manager ask an employee whether they have been vaccinated?

No. A person’s vaccination status is private, just like any other medical issue or condition, and employees are not required to share this information with supervisors or managers. There are limited exceptions to this in certain types of jobs (such as health care roles) where sharing vaccine status information is required, but in these limited cases employees are formally notified of this requirement. In general, especially as more people become eligible for vaccination due to health conditions, it is important to avoid asking these types of questions of employees because it could cause an employee to feel compelled to share medical or disability information and this should be avoided.