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This link yields the following information :
quote:
"Hemorrhagic fever (HF) is a clinical syndrome featuring fever, myalgia, malaise, hemorrhage, and in some cases, hypotension, shock and death. The hemorrhagic fever viruses belong to four families of lipid enveloped viruses with single-stranded RNA genomes.[129] The taxonomy, ecology, and epidemiology of these viruses are summarized in Table 3. Transmission of HF viruses varies with the specific virus. However, all of the HF viruses, with the exception of dengue, are potentially transmitted via aerosol, underscoring their possible role as BW agents.[129]
Hemorrhagic fever viruses are transmitted by arthropod vectors or contact with infected animal reservoirs.[105] Arenaviruses and Hantaviruses are transmitted by inhalation of aerosolized rodent excreta, while Rift Valley Fever and Congo-Crimean hemorrhagic fever (CCHF) can be aerosolized during the butchering of infected livestock.[129] The reservoir for filoviruses remains a mystery.[10,30,44,56,59,84] Person-to-person spread may occur via direct contact with infected patients or their blood and body fluids.[25,32] Four viral hemorrhagic fevers (VHFs) have a high risk of nosocomial spread and are quarantinable conditions: Lassa fever, CCHF, Ebola fever, and Marburg disease.[44,59] While epidemiologic studies indicate that respiratory transmission of viral hemorrhagic fevers does not occur among humans, such transmission has occurred among non-human primates. In addition, subclinical human infections due to a filovirus virulent for monkeys (Ebola-Reston) have occurred after respiratory exposure to infected animals.[130]"
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