Public health

Public health is a field of study and government action which addresses issues which affect entire populations or groups of people. The Centers for Disease Control in the United States is an example of a national agency which addresses public health issues such as epidemics and infectious diseases. In the United States most counties have a public health nurse or department which monitors the health of the population and identifies public health issues and offers services.

Tobacco
Endemic tobacco use, which results in 10s of millions of deaths globally, is a particularly difficult public health issue. In the People's Republic of China the situation is complicated by the substantial profits the state-controlled tobacco monopoly remits to the state.

Developing world
There are a number of significant issues in the developing world which as of 2013 remain unresolved, for example, rabies in India and Africa, and iodine deficiency in India, but that is just the tip of the iceberg.