Likewise, certain diseases are present in a set population of people or geographic region of the world with just as much consistency. When a disease is present in a population or geographic region at consistent levels and periods of time, we term this an endemic disease. For example, the disease malaria is endemic to tropical areas of the world, such as those in South America or Africa. Malaria, however, is not endemic to Antarctica since it's not present there. The flu is endemic to a Chicago winter but not summer. And so on.