Tropical medicine is the branch of medicine is dedicated to treatment, care and cure of tropical diseases, which are commonly occurring in developing countries due to lack of hygiene, knowledge etc. The most commonly occuring tropical diseases are Chagas disease, Dengue, Helminths, African trypanosomiasis, Leishmaniasis, Malaria, Sexually transmitted infections etc. Many of these diseases have been controlled or even eliminated from developed countries, as a result of improvements in housing, diet, sanitation, and personal hygiene.
Parasitology is the study of parasites and the interaction of parasites with its hosts. A parasite is an organism that lives on or within another organism called the host. Plasmodium, Leishmania donovani, Entamoeba and Giardia are the parasites which causes parasitic diseases.