Venezuelan hemorrhagic fever

Jump to: navigation, search
Guanarito virus
Virus classification
Group: Group V ((-)ssRNA)
Family: Arenaviridae
Genus: Arenavirus
Species

Guanarito virus

WikiDoc Resources for Venezuelan hemorrhagic fever

Articles

Most recent articles on Venezuelan hemorrhagic fever

Most cited articles on Venezuelan hemorrhagic fever

Review articles on Venezuelan hemorrhagic fever

Articles on Venezuelan hemorrhagic fever in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Venezuelan hemorrhagic fever

Images of Venezuelan hemorrhagic fever

Photos of Venezuelan hemorrhagic fever

Podcasts & MP3s on Venezuelan hemorrhagic fever

Videos on Venezuelan hemorrhagic fever

Evidence Based Medicine

Cochrane Collaboration on Venezuelan hemorrhagic fever

Bandolier on Venezuelan hemorrhagic fever

TRIP on Venezuelan hemorrhagic fever

Clinical Trials

Ongoing Trials on Venezuelan hemorrhagic fever at Clinical Trials.gov

Trial results on Venezuelan hemorrhagic fever

Clinical Trials on Venezuelan hemorrhagic fever at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Venezuelan hemorrhagic fever

NICE Guidance on Venezuelan hemorrhagic fever

NHS PRODIGY Guidance

FDA on Venezuelan hemorrhagic fever

CDC on Venezuelan hemorrhagic fever

Books

Books on Venezuelan hemorrhagic fever

News

Venezuelan hemorrhagic fever in the news

Be alerted to news on Venezuelan hemorrhagic fever

News trends on Venezuelan hemorrhagic fever

Commentary

Blogs on Venezuelan hemorrhagic fever

Definitions

Definitions of Venezuelan hemorrhagic fever

Patient Resources / Community

Patient resources on Venezuelan hemorrhagic fever

Discussion groups on Venezuelan hemorrhagic fever

Patient Handouts on Venezuelan hemorrhagic fever

Directions to Hospitals Treating Venezuelan hemorrhagic fever

Risk calculators and risk factors for Venezuelan hemorrhagic fever

Healthcare Provider Resources

Symptoms of Venezuelan hemorrhagic fever

Causes & Risk Factors for Venezuelan hemorrhagic fever

Diagnostic studies for Venezuelan hemorrhagic fever

Treatment of Venezuelan hemorrhagic fever

Continuing Medical Education (CME)

CME Programs on Venezuelan hemorrhagic fever

International

Venezuelan hemorrhagic fever en Espanol

Venezuelan hemorrhagic fever en Francais

Business

Venezuelan hemorrhagic fever in the Marketplace

Patents on Venezuelan hemorrhagic fever

Experimental / Informatics

List of terms related to Venezuelan hemorrhagic fever

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Venezuelan hemorrhagic fever (VHF) is a zoonotic human illness first identified in 1989. The disease is most prevalent in several rural areas of central Venezuela and is caused by the Guanarito virus (GTOV) which belongs to the Arenaviridae family. The short-tailed cane mouse (Zygodontomys brevicauda) is the main host for GTOV [1] which is spread mostly by inhalation of aerosolized droplets of saliva, respiratory secretions, urine, or blood from infected rodents.[2] Person-to-person spread is possible, but uncommon.

History

From September 1989 through December 2006, the State of Portuguesa recorded 618 cases of VHF. Nearly all of the cases were individuals who worked or lived in Guanarito during the time they became infected. The case fatality rate was 23.1%.[3]

Because the virus is contracted by aerosol dissemination, concern arose shortly after the first cases emerged in 1989 due to fear of biological warfare. Potential biological terrorism agents were identified and categorized in 1999 by the Centers for Disease Control and Prevention (CDC) as part of the Congressional initiative to further response capabilities to biological weapons [4] . Arenaviruses causing hemorrhagic fevers, along with a genus of virus called filoviruses, were categorized in Category A; these are pathogens with the highest potential impact on public health safety.

A notable event in the timeline of this virus' scientific knowledge was the unexplained disappearance of a vial of the virus at the University of Texas Medical Branch Galveston National Laboratory, announced 2013 March 24.[5]

Virus

Arenaviruses are enveloped, single-stranded, bisegmented RNA viruses with ambisense genomes.[6] Based on their antigenic properties, arenaviruses have been classified into two major groups: the Old World arena viruses, and the New World arenaviruses. Old World arena viruses include lymphocytic choriomeningitis virus, and Lassa virus. New world arena viruses are further broken down into three clades, A, B, and C. The Guanarito arena virus belongs to clade B and is the cause of VHF. On the biosafety level scale of one to four, with four causing the most risk, the viruses causing hemorrhagic fevers have been assigned a four by the CDC.[7]

Host

The short-tailed cane mouse, the main host of GTOV, is native to western Venezuela and resides in large numbers in tall grass, cultivated agricultural fields, human homes, and outbuildings.[3] It is speculated that demographic and ecological changes in the rural areas increased the frequency of contact between humans and infected rodents such that VHF emerged.[3]

Presentation

VHF has many similarities to Lassa fever and to the arenavirus hemorrhagic fevers that occur in Argentina and Bolivia.[6] It causes fever and malaise followed by hemorrhagic manifestations and convulsions.[8] Some presentations of the virus are also characterized by vascular damage, bleeding diathesis, fever, and multiple organ involvement. Clinical diagnosis of VHF has proven to be difficult based on the nonspecific symptoms.[4] The disease is fatal in 30% of cases and is endemic to Portuguesa state and Barinas state in Venezuela.

Treatment and prevention for the VHF virus are limited and there are currently no licensed vaccines available that can act to prevent the disease [4] . However, once infected, Ribavirin, an anti-viral drug given intravenously, is one way to treat VHF.

References

  1. Salas, R., and De Manzione, N.. "Venezuelan haemorrhagic fever." Lancet. 8774.338 (1991): 1033-1037. Print.
  2. Milazzo, Mary L., Narua N.B. Caimat, Gloria Duno, Freddy Duno, Antonio Utera, and Charles F. Fulhorst."Transmission of Guanarito and Pirital Viruses among Wild Rodents, Venezuela."Emerging Infectious Diseases. 17.12 (2011): 2209-2215. Web. 26 Apr. 2012. <www.cdc.gov/eid>.
  3. 3.0 3.1 3.2 Fulhorst, Charles F., Maria N.B. Cajimat, Mary Louise Milazzo, Hector Paredes, Nuris M.C. deManzione, Rose A. Sala, Pierre E. Rollin, and Thomas G. Ksiazek. "Genetic diversity between and within the arenavirus species indigenous to western Venezuela." Virology. 378.2 (2008): 205-213. Print. <http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2583173/>.
  4. 4.0 4.1 4.2 Hruby, D.E., Bolken, T.C., & Dai, D. (2011). U.S. Patent No. 7,872,037. Corvallis, OR: Siga Technologies, Inc.
  5. http://www.kltv.com/story/21779393/virus-vial-missing-from-galveston-lab
  6. 6.0 6.1 Radoshitzky, Sheli R., Jens H. Kuhn't, Christina F. Spiropoulout, Cesar G. Albarifiod, Dan P. Nguyen, Jorge Salazar-Bravo, Tatyana Dorfman, Amy S. Lee, Enxiu Wang, Susan R. Rossll, Hyeryun Choe, and Michael Farzan. "Receptor determinants of zoonotic transmission of New World hemorrhagic fever arenaviruses." Proceedings of the National Academy of Sciences of the United States of America. 105.7 (2008): 2664-2669. Print.
  7. (May 19, 2011).Special Pathogens Branch. Centers for Disease Control and Prevention. http://www.cdc.gov/ncidod/dvrd/spb/mnpages/disinfo.htm
  8. de Manzione N, Salas RA, Paredes H; et al. (1998). "Venezuelan hemorrhagic fever: clinical and epidemiological studies of 165 cases". Clin. Infect. Dis. 26 (2): 308–13. doi:10.1086/516299. PMID 9502447.

Template:Zoonotic viral diseases


Linked-in.jpg