A disease is described as endemic to the particular geographical area in which humans are known to contract the disease. Many diseases only affect persons who visit particular areas, such as malaria, melioidosis, Rocky Mountain Spotted Fever, African trypanosomiasis and leishmaniasis. People who have never visited areas where a disease is not endemic have a virtually zero chance of having such diseases even if their symptoms otherwise seem to fit. As such, a medical history is not complete unless the patient's entire travel history is included.
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