The topic of mandatory vaccination in the workplace remains relevant, even though the global COVID-19 pandemic has been brought under control. The return of eradicated diseases we only read about in books – such as whooping cough or measles – is prompting more and more employers to wonder what they can do to ensure safe working conditions. Specifically, to protect the health of their employees, could they check their vaccination status, or perhaps, going a step further, require unvaccinated people to get vaccinated when vaccination is mandatory in Poland?