Crimean Congo hemorrhagic fever (CCHF) is a widespread tick-borne viral disease, a zoonosis of domestic animals and wild animals, that may affect humans. The pathogenic virus, especially common in East and West Africa, is a member of the Bunyaviridae family of RNA viruses. Clinical disease is rare in infectedmammals, but commonly severe in infected humans, with a 30% mortality rate.Outbreaks of illness are usually attributable to handling infected animals or people.
Typically, after a 1–3 day incubation period following a tick bite (5–6 days after exposure to infected blood or tissues), flu-like symptoms appear, which may resolve after one week. In up to 75% of cases, however, signs of hemorrhage appear within 3–5 days of the onset ofillness in case of bad containment of the first symptoms: first mood instability, agitation, mental confusion and throat petechiae, then soonnosebleeds, bloody urine and vomiting, and black stools. The liver becomes swollen and painful. Disseminated intravascular coagulation may occur as well as acute kidney failure and shock, and sometimes acute respiratory distress syndrome.
Patients usually begin to recover after 9–10 days from symptom onset, but 30% die in the second week of illness.
Where mammal and tick infection is common agricultural regulations require de-ticking farm animals before transportation or delivery forslaughter. Personal tick avoidance measures are recommended, such as use of insect repellents, adequate clothing and body inspection for adherent ticks.
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When feverish patients with evidence of bleeding require resuscitation or intensive care, body substance isolation precautions should be taken.
The United States armed forces maintain special stocks of ribavirin to protect personnel deployed to Afghanistan and Iraq from CCHF.
Treatment is primarily symptomatic and supportive, as there is no established specific treatment. Ribavirin is effective in vitro and has been used during outbreaks, but there is no trial evidence to support its use.
Sporadic infection of people is usually caused by Hyalomma tick bite. Clusters of illness typically appear after people treat, butcher or eat infected livestock, particularly ruminants and ostriches. Outbreaks have occurred in clinical facilities where health workers have been exposed to infected. blood and fomites.
The causative organism is found in Asia, Eastern Europe, the Middle East, a belt across central Africa and South Africa and Madagascar (see map ) The main environmental reservoir for the virus is small mammals (particularlyEuropean hare, Middle-African hedgehogs and multimammate rats).
Ticks carry the virus to domestic animal stock.Sheep, goats and cattle develop high titers of virus in blood, but tend not to fall ill. Birds are generally resistant with the exception of ostriches.
Isolated male patient diagnosed with Crimean-Congo hemorrhagic fever
During the summers of 1944 and 1945 over 200 cases of an acute, hemorrhagic, febrile illness occurred in Soviet troops rescuing the harvest following the ethnic cleansing of the Crimean Tatars.
On July 28, 2005 authorities reported 41 cases of CCHF in Turkey’s Yozgat Province, with one death. As of August 2008, a total of 50 people were reported to have lost their lives in various cities in Turkey due to CCHF. 3128 Crimean–Congo hemorrhagic fever cases with 5% of case-fatality rate have been reported by the Ministry of Health of Turkey between 2002-2008.
On May 27, 2010 Hospitals reported 70 cases of CCHF in Kosovo ‘s Kosovo Polje, with 4 deaths reported so far. The Authorities are not able to deal with the disease because of the lack of advanced medication.
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In September, 2010 an outbreak has been reported in Pakistan ‘s Khyber Pakhtunkhwa province. Poor diagnosis and record keeping has caused the extent of the outbreak to be uncertain, though some reports indicate over 100 cases, with a case-fatality rate above 10%.
In January 2011The disease was also reported in Gujarat, India, with 3 reported deaths.
Soviet scientists first identified the disease they called Crimean hemorrhagic fever in 1944 and established its viral etiology by passage of the virus through human “volunteers” (fatality rate unreported), but were unable to isolate the agent at that time. In June 1967, Soviet virologistMikhail Chumakov registered an isolate from a fatal case that occurred in Samarkand (on the ancient Silk Road in Central Asia, not the Crimea) in the Catalogue of Arthropod-borne Viruses. Four months earlier, virologists Jack Woodall, D Simpson and others had published initial reports on a virus they called the Congo virus, first isolated in 1956 by physician Ghislaine Courtois, head of the Provincial Medical Laboratory, Stanleyville, Belgian Congo. Strain V3010, isolated by Courtois, was sent to the Rockefeller Foundation Virus Laboratory (RFVL) in New York City and found to be identical to another strain from Uganda, but to no other named virus at that time. Chumakov later sent his strain to the RFVL, where it was found to be identical to the Congo virus. The International Committee on Taxonomy of Viruses proposed the name Congo-Crimean hemorrhagic fever virus, but the Soviets insisted on Crimean–Congo hemorrhagic fever virus. Against all principles of scientific nomenclature based on priority of publication, it was adopted as the official name in 1973 in possibly the first instance of a virus losing its name to politics and the Cold War. However, since then Congo-Crimean or just Congo virus has been used in many reports, which would be missed in searches of medical databases using the official name. These reports include records of the occurrence of the virus or antibodies to the virus from Greece, Portugal, South Africa, Madagascar (the first isolation from there), the Maghreb, Dubai, Saudi Arabia, Kuwait and Iraq.