Hopefully the vaccination status of the co-worker was from the co-worker and not the organization to minimize privacy concerns. If your organization is not willing/able/feel it is necessary to have a mandatory vaccination policy then it will need to continue to be 100% reliant on the measures that we are all used to now: barriers, physical distancing, masks, etc. to ensure the health and safety of all employees – vaccinated and unvaccinated. A vaccine mandate is just one tool that can be used to keep your employees safe. Communication is key to ensure both the vaccinated and unvaccinated are aware of the steps that are being taken to keep everyone safe at work.