Crimean-Congo hemorrhagic fever | China| PDF | PPT| Case Reports | Symptoms | Treatment

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Crimean-Congo Hemorrhagic Fever

  • Crimean-Congo hemorrhagic fever

    Crimean–Congo hemorrhagic fever (CCHF) is a widespread tick-borne viral disease. The virus is a member of the Bunyaviridae family of RNA viruses. It is a zoonotic disease carried by several domestic and wild animals. While clinical disease is rare in infected animals, it is severe in infected humans, with a mortality rate of 10-40%. Outbreaks of illness are usually attributable to Hyalomma tick bites or contact with infected animals or people. The virus is primarily transmitted to people from ticks and livestock animals. Human-to-human transmission can occur resulting from close contact with the blood, secretions, organs or other bodily fluids of infected persons. The symptoms include mood instability, agitation, mental confusion and throat petechiae, then soon nosebleeds, rainbow 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 show signs of recovery after 9–10 days from when the symptoms appear, however 30% of the cases result in death on the second week of the illness.
    The average prevalence of CCHFV antibody in serum samples of humans and livestock was 1.7% and 12.7%, respectively. The CCHFV antibodies in human sera were at low levels (0.4 to 5.8%), with low range variations among different regions. A relatively high prevalence of the CCHFV antibody, ranging from 19.1 to 23.4%, was found in the livestock sera from the northwest, southwest, and northeast parts of the Tarim Basin (China). In contrast, a relatively low prevalence of the CCHFV antibody, ranging from 3.5 to 6.9%, was found in the livestock sera from the southeast part of the Tarim Basin, the Junggar Basin, and the Turpan-Hami Basin.

  • Crimean-Congo hemorrhagic fever

    General supportive care with treatment of symptoms is the main approach to managing CCHF in people. The antiviral drug ribavirin has been used to treat CCHF infection with apparent benefit. Both oral and intravenous formulations seem to be effective.
    The ongoing researches in China on Crimean–Congo hemorrhagic fever include: Crimean-Congo hemorrhagic fever: history, epidemiology, pathogenesis, clinical syndrome and genetic diversity, Mini-genome rescue of Crimean-Congo hemorrhagic fever virus and research into the evolutionary patterns of its untranslated regions.

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