TLDR: It's treated like a driver's license.
If it's listed in the job requirements, then it's up to the applicant to prepare by getting vaccinated. If it's not listed as a requirement, then someone asking you to do it is not legally binding.
If it's listed in the job requirements, then it's up to the applicant to prepare by getting vaccinated. If it's not listed as a requirement, then someone asking you to do it is not legally binding.
My mum was able to find a job many decades back with no knowledge of how to use Microsoft. With time, and as the company grew with it, of course staff need to be more proficient with IT and tech. They then offered upgrading skills/courses for current employees, and made this a requirement for their new hires. Supposing the employees didn't want to take the upgrading courses, can they really complain if they are then fired for not having the right skills to do their job? I should think no.