On February 1st a national vaccine mandate took effect in Austria. Those over the age of 18 who have not been vaccinated could face fines up to €3,600. Several other countries have introduced similar mandates for the elderly, medical staff and care home workers. Putting aside the question of whether these mandates are effective, there are concerns around their ethical status. Those resisting vaccination say it should be their choice whether to get the jab, not the state’s. Others argue that in liberal societies, the state has a right to limit the freedom of individuals when their behaviour harms others. Whether vaccine mandates are morally justifiable or not, then, turns on whether the unvaccinated harm the rest of the population. Given how Covid vaccines work, it’s hard to make that case.