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Review article| Volume 22, ISSUE 4, P981-1020, December 2002

Viral hemorrhagic fevers including hantavirus pulmonary syndrome in the Americas

      The term viral hemorrhagic fever (VHF) refers to an acute systemic illness classically involving fever, a constellation of initially nonspecific signs and symptoms, and a propensity for bleeding and shock. Capillary leakage, impaired hemostasis, and in some cases, impaired cardiac inotropy are the pathophysiologic hallmarks. VHFs may be caused by more than 25 different viruses from four families: Flaviviridae, Arenaviridae, Bunyaviridae, and Filoviridae (Table 1). VHFs of various etiologies exist worldwide, although because these diseases are primarily zoonotic, the distribution of any given virus is generally restricted by the distribution of its natural reservoir or arthropod vector. In most cases, human infection is rare. However, increased international travel and the high communicability, case-fatality ratios, and potential for nosocomial amplification often associated with the VHFs make them of concern even outside areas where they are endemic. Fears over importations usually focus on returning travelers, although importation of infected reservoirs or vectors with subsequent transmission to humans has occasionally occurred. Recent concern about bioterrorism has made intentional release of these agents an issue as well.
      Table 1Principal viruses causing hemorrhage fevers
      Virus Disease Geographic distribution Principal reservoir/vector Annual cases Case: Infection ratio Human-to-human transmissibility
      Flaviviridae
       Yellow fever Yellow fever Africa, South America Monkey/mosquito (Aedes aegypti, other Aedes and Haemagogus spp.) 5000–200,000
      Based on estimates from the World Health Organization. Significant underreporting occurs. Incidence may fluctuate widely depending on epidemic activity.
      1:2–20 No
       Dengue Dengue fever and dengue hemorrhagic fever Tropics and subtropics worldwide Human/mosquito (Aedes aegypti) Dengue fever: 100 million, Dengue hemorrhagic fever: 100,000–200,000
      Based on estimates from the World Health Organization. Significant underreporting occurs. Incidence may fluctuate widely depending on epidemic activity.
      1:10–100 depending on age, previous infection, genetic background, and infecting serotype No
       Kyasanur Forest disease Kyasanur Forest disease Karnataka state, India Vertebrate (rodents, bats, birds, monkeys, others)/tick (Ixodes) 400–500 Unknown Not reported, but laboratory infections have occurred
       Omsk hemorrhagic fever Omsk hemorrhagic fever Western Siberia Rodent/tick (Ixodes), maintenance cycle incompletely understood 100–200 Unknown Not reported
      Arenaviridae
       Junin Argentine hemorrhagic fever Argentine pampas Rodent (the “corn mouse” or Calomys musculinus) 100–200 1:1.5 Low
       Machupo Bolivian hemorrhagic fever Beni department, Bolivia Rodent (the “large vesper mouse” or Calomys callosus) <50 1:1.5 Low
       Guanarito Venezuelan hemorrhagic fever Portuguesa state, Venezuela Rodent (the “cane mouse” or Zygodontomys brevicauda) <50 1:1.5 Low
       Sabiá
      First discovered in 1990. Only 3 cases (1 fatal) of Sabiá virus infection have been noted, 2 of them related to laboratory infection. Disease from this virus is presumed to be similar to the other South American hemorrhagic fevers.
      Proposed name: Brazilian hemorrhagic fever
      First discovered in 1990. Only 3 cases (1 fatal) of Sabiá virus infection have been noted, 2 of them related to laboratory infection. Disease from this virus is presumed to be similar to the other South American hemorrhagic fevers.
      Rural area near Sao Paulo, Brazil? Unknown (Rodent?)
      First discovered in 1990. Only 3 cases (1 fatal) of Sabiá virus infection have been noted, 2 of them related to laboratory infection. Disease from this virus is presumed to be similar to the other South American hemorrhagic fevers.
      First discovered in 1990. Only 3 cases (1 fatal) of Sabiá virus infection have been noted, 2 of them related to laboratory infection. Disease from this virus is presumed to be similar to the other South American hemorrhagic fevers.
      1:1.5 Low?
      First discovered in 1990. Only 3 cases (1 fatal) of Sabiá virus infection have been noted, 2 of them related to laboratory infection. Disease from this virus is presumed to be similar to the other South American hemorrhagic fevers.
       Lassa Lassa fever West Africa Rodent (the “multimammate rat” or Mastomys spp.) 100,000–300,000 1:5–10 Moderate
      Bunyaviridae
       Hantaan, Seoul, Puumala, Dobrava, others Hemorrhagic fever with renal syndrome Hantaan: northeast Asia; Seoul: urban areas world- wide; Puumala and Dobrava: Europe Rodent (Hantaan: the “striped field mouse” or Apodemus agrarius; Seoul: the “Norway rat” or Rattus norwegicus; Puumala: the “bank vole” or Clethrionomys glareolus; Dobrava: the “yellow-necked field mouse” or Apodemus flavicollis) 50,000–150,000 Hantaan: 1:1.5 Others: 1:20 No
       Sin Nombre, Andes, Laguna Negra, others Hantavirus pulmonary syndrome Sin Nombre: North America; Andes and Laguna Negra: South America Rodents (Sin Nombre: the “deer mouse” or Perimyscus maniculatus; Andes: the “long-tailed pygmy rice-rat” or Oligorysomys longicaudatus; Laguna Negra: the “vesper mouse” or Calomys laucha) 10–50 1:1
      Whereas virtually all infections due to the North American hantavirus Sin Nombre virus appear to be symptomatic, serosurveys have suggested asymptomatic transmission of some hantaviruses in South America.
      No
      Epidemiologic evidence strongly supports the occurrence of nosocomial transmission of Andes virus during an outbreak in Argentina in 1996 [1,2]. This appears to be an isolated incident, as reviews of previously occurring outbreaks in the United States and elsewhere have not supported a conclusion of inter-human transmission of non-Andes hantaviruses.
       Rift Valley fever Rift Valley fever Sub-Saharan Africa Domestic livestock/mosquitoes (Aedes and others) 100–100,000
      Based on estimates from the World Health Organization. Significant underreporting occurs. Incidence may fluctuate widely depending on epidemic activity.
      1:100 No
       Crimean-Congo hemorrhagic fever Crimean-Congo hemorrhagic fever Africa, Middle East, Balkans, southern Russia, western China Wild and domestic vertebrates/tick (Hyalomma spp.) ∼100 1:1–2 High
      Filoviridae
       Ebola Ebola hemorrhagic fever Sub-Saharan Africa, Philippines? Unknown
      Although some endemic transmission of the filoviruses may occur, these diseases have usually been recognized only in epidemic form. Ebola hemorrhagic fever epidemics typically involve <500 people, and Marburg <100. Epidemics have been recognized with increasing frequency during the period 1994–2002.
      1:1 High
       Marburg Marburg hemorrhagic fever Sub-Saharan Africa Unknown
      Although some endemic transmission of the filoviruses may occur, these diseases have usually been recognized only in epidemic form. Ebola hemorrhagic fever epidemics typically involve <500 people, and Marburg <100. Epidemics have been recognized with increasing frequency during the period 1994–2002.
      1:1 High
      a Based on estimates from the World Health Organization. Significant underreporting occurs. Incidence may fluctuate widely depending on epidemic activity.
      b First discovered in 1990. Only 3 cases (1 fatal) of Sabiá virus infection have been noted, 2 of them related to laboratory infection. Disease from this virus is presumed to be similar to the other South American hemorrhagic fevers.
      c Whereas virtually all infections due to the North American hantavirus Sin Nombre virus appear to be symptomatic, serosurveys have suggested asymptomatic transmission of some hantaviruses in South America.
      d Epidemiologic evidence strongly supports the occurrence of nosocomial transmission of Andes virus during an outbreak in Argentina in 1996
      • Padula P.J
      • Edelstein A
      • Miguel S.D.L
      • Lopez N.M
      • Rossi C.M
      • Rabinovich R.D
      Hantavirus Pulmonary Syndrome outbreak in Argentina: Molecular evidence for person-to-person transmission of Andes virus.
      ,
      • Wells R.M
      • Estani S.S
      • Yadon Z.E
      • et al.
      An unusual hantavirus outbreak in southern Argentina: Person-to-person transmission?.
      . This appears to be an isolated incident, as reviews of previously occurring outbreaks in the United States and elsewhere have not supported a conclusion of inter-human transmission of non-Andes hantaviruses.
      e Although some endemic transmission of the filoviruses may occur, these diseases have usually been recognized only in epidemic form. Ebola hemorrhagic fever epidemics typically involve <500 people, and Marburg <100. Epidemics have been recognized with increasing frequency during the period 1994–2002.
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