<unk>  is a vector borne disease in which humans are primarily the main hosts. The vector through which the disease is typically transmitted is referred to as the human body louse “Pediculus humanus humanus”, which is better known as lice. The British Expeditionary Force Pyrexia of Unknown Origin Enquiry Sub-Committee concluded that the specific means by which the vector infected the host was louse waste entering the body through abraded skin. Although the disease is typically found in humans, the gram negative bacterium which induce the disease have been seen in mammals such as dogs, cats, and macaques in small numbers. Being that the vector of the disease is human body louse, it can be determined that the main risk factors for infection are mostly in relation to contracting body louse. Specifically, some risk factors include: body louse infestation, overcrowded and unhygienic conditions, body hygiene, war, famine, malnutrition, alcoholism, homelessness, and intravenous drug abuse. The identified risk factors directly correlate with the subpopulations of identified infected persons throughout the duration of the known disease. Historically,<unk>  was found in young male soldiers of World War I, whereas in the 21st century the disease mostly has a prevalence in middle aged homeless men. This can be seen when looking at a 21st-century outbreak of the disease in Denver, Colorado, where researcher David McCormick and his colleagues came across the gram negative bacterium in 15% of the 241 homeless persons who were tested. Another study done in Marseille, France found the bacterium in 5.4% of the 930 homeless individuals they tested.
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Chikungunya
Cuban fever
Yellow fever
Cotton fever
Tomato fever
Barcoo fever
Ross River fever