Argentine hemorrhagic fever

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Argentine hemorrhagic fever
Infectious disease

Argentine hemorrhagic fever (AHF) or O'Higgins disease, also known in Argentina as mal de los rastrojos (stubble disease) is a

Machupo virus, causative agent of Bolivian hemorrhagic fever). Its reservoir of infection is the drylands vesper mouse, a rodent
found in Argentina and Paraguay.

Epidemiology

The disease was first reported in the town of

Weil's disease, leptospirosis, chemical pollution.[2]
It was associated with fields containing stubble after the harvest, giving it another of its names.

The endemic area of AHF covers approximately 150,000 km2, compromising the

Córdoba, Santa Fe and La Pampa, with an estimated risk population of 5 million.[citation needed
]

The

asymptomatic infection, and spreads the virus through its saliva and urine. Infection is produced through contact of skin or mucous membranes, or through inhalation of infected particles. It is found mostly in people who reside or work in rural areas; 80% of those infected are males between 15 and 60 years of age.[citation needed
]

Clinical aspects

AHF is a grave acute disease which may progress to recovery or death in 1 to 2 weeks. The incubation time of the disease is between 10 and 12 days, after which the first symptoms appear: fever, headaches, weakness, loss of appetite and will. These intensify less than a week later, forcing the infected to lie down, and producing stronger symptoms such as vascular, renal, hematological and neurological alterations. This stage lasts about 3 weeks.[citation needed]

If untreated, the mortality of AHF reaches 15–30%. The specific treatment includes plasma of recovered patients, which, if started early, is extremely effective and reduces mortality to 1%.[3]

Ribavirin also has shown some promise in treating arenaviral diseases.

The disease was first detected in the 1950s in the Junín Partido in Buenos Aires, after which its agent, the Junín virus, was named upon its identification in 1958. In the early years, about 1,000 cases per year were recorded, with a high mortality rate (more than 30%). The initial introduction of treatment serums in the 1970s reduced this lethality.

Vaccine

The Candid #1

Machupo virus in Rhesus macaques, and thus Candid #1 been considered for prophylactic use against Bolivian hemorrhagic fever.[4]

Candid #1 has been applied to adult high-risk population and is 95.5% effective.[5] Between 1991 and 2005 more than 240,000 people were vaccinated, achieving a great decrease in the numbers of reported cases (94 suspect and 19 confirmed in 2005).

On 29 August 2006 the Maiztegui Institute obtained certification for the production of the vaccine in Argentina. The vaccine produced in Argentina was found to be of similar effectiveness to the US vaccine.[6] Details of the vaccine were published in 2011,[5] and a protocol for production of the vaccine was published in 2018.[7] Demand for the vaccine is insufficient to be commercially appealing due to the small target population, and it is considered an orphan drug; the Argentine government committed itself to manufacture and sponsor Candid #1 vaccine.[5]

Weaponization

Argentine hemorrhagic fever was one of three hemorrhagic fevers and one of more than a dozen agents that the United States researched as potential

biological weapons before the nation suspended its biological weapons program.[8] The Soviet Union also conducted research and developing programs on the potential of the hemorragic fever as a biological weapon.[9]

References

  1. PMID 23202466
    . Junín virus, the etiological agent of Argentine hemorrhagic fever, causes significant morbidity and mortality.
  2. ^ a b Agnese G (July 2007). "Una rara enfermedad alarma a la modesta población de O'Higgins. Análisis del discurso de la prensa escrita sobre la epidemia de Fiebre Hemorrágica Argentina de 1958" [A rare disease alarms the modest population of O'Higgins. Analysis of the discourse of the written press on the Argentine Hemorrhagic Fever epidemic of 1958] (PDF). Revista de Historia & Humanidades Médicas [Journal of Medical History and Humanities] (in Spanish). 3 (1). Archived from the original (PDF) on 12 January 2014.
  3. PMID 26261205
    .
  4. PMID 24068704
    .
  5. ^
    S2CID 42889001
    .
  6. ^ Enria DA, Ambrosio AM, Briggiler AM, Feuillade MR, Crivelli E (2010). "Vacuna contra la fiebre hemorrágica argentina Candid#1 producida en la Argentina. Inmunogenicidad y seguridad" [Candid#1 vaccine against Argentine hemorrhagic fever produced in Argentina. Immunogenicity and safety]. MEDICINA (Buenos Aires). 70: 215–222. Article in Spanish with abstract in English.
  7. PMID 28986845
    .
  8. ^ ""Chemical and Biological Weapons: Possession and Programs Past and Present". James Martin Center for Nonproliferation Studies. Middlebury College. 9 April 2002. Archived from the original on 2001-10-02. Retrieved 14 November 2008.
  9. ISBN 0-674-01699-8
    .

Further reading

External links

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