Tropical diseases: definition, geographic distribution, transmission, and classification

The term tropical diseases encompasses all diseases that occur principally in the tropics. This term covers all communicable and noncommunicable diseases, genetic disorders, and disease caused by nutritional deficiencies or environmental conditions (such as heat, humidity, and altitude) that are encountered in areas that lie between, and alongside, the Tropic of Cancer and Tropic of Capricorn belts. In tropical countries, apart from noncommunicable diseases, a severe burden of disease is caused by an array of different microorganisms, parasites, land and sea animals, and arthropods.     

The resurgence of disease: social and historical perspectives on the 'new' tuberculosis

The resurgence of tuberculosis is one of the most serious global public health challenges of the twenty-first century. This paper argues that the decline of tuberculosis since the nineteenth century is far better understood than its resurgence over the last twenty years. It is suggested that insights gained from the historical study of disease may provide a better analytical framework for understanding the contemporary dynamics of disease epidemiology than the current emphasis on the bio-medical and behavioural characteristics of individual patients. It is concluded that tuberculosis research requires a combination of advances in bio-medical knowledge with a broader understanding of the evolving relationship between disease and modern societies.