Color-enhanced Transmission Electron Micrograph (TEM) showing eight virions (viral particles) of a newly-discovered virus, which was determined to be a member of the genus Arenavirus. A cause of fatal hemorrhagic fever, it was confirmed that this virus was responsible for causing illness in five South Africans, four of whom died having succumbed to its devastating effects. Magnification unknown. Ultrastructurally, these round Arenavirus virions displayed the characteristic granular capsid, an appearance from which the Latin name "arena" was derived. Other members of the genus include the West African Lassa fever virus, lymphocytic choriomeningitis (LCM), and Bolivian hemorrhagic fever (BHF), also known as Machupo virus, all of which are spead to humans through their inhalation of airborne particulates originating from rodent excrement, which can occur during the simple act of sweeping a floor.