  The poor in developing countries are also often more vulnerable to disease and less able to resist disease because of poor living conditions related to poverty. Lack of clean water, clean energy sources, inadequate nutrition, and other social determinants of health play a key role in explaining this increased vulnerability.  Living in overcrowded houses can facilitate the spread of infectious diseases, such as tuberculosis. So, a number of issues that sustain poverty or exacerbate people’s vulnerability to disease as a result of poverty should be of concern (Benatar and Brock 2011). As Norman Daniels argues, health inequalities among different social groups can be considered unjust when they result from unjust distribution in factors that are socially controllable that affect population health (Daniels 2011, 101). On this view many of the health inequalities that exist are ones that ought to be of concern as they meet this criterion. How should responsibilities for improving this situation be allocated? In many ways, but here I pick out just a few that have received considerable attention in the philosophical literature.