International health, also calle geographic medicine or global health, is a field of health care, usually with a public health emphasis, dealing with health across regional or national boundaries. One subset of international medicine, travel medicine, prepares travelers with immunizations, prophylactic medications, preventive techniques such as bednets and residual pesticides, in-transit care, and post-travel care for exotic illnesses. International health, however, more often refers to health personnel or organizations from one area or nation providing direct health care, or health sector development, in another area or nation. It is this sense of the term that is explained here.