The term tropical diseases include all diseases that occur in the tropical and sub-tropical regions. Tropical diseases cover all communicable and non-communicable diseases, including disease caused by malnutrition or environmental conditions and genetic disorders which is caused by different microorganisms, parasites, arthropods and sea animals. All of these types of agents are referred as pathogens (organisms that cause disease). In the temperate regions both viral and bacterial diseases are transmit directly from person to person, by airborne routes or by sexual contact. In addition, many diseases are spread by contaminated water and food due to lack of sanitary conditions and clean water. Alternatively, some tropical disease agents are transmitted by intermediate carriers and also called as vectors.
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