crimean congo hemorrhagic fever
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Science ◽  
2022 ◽  
Vol 375 (6576) ◽  
pp. 104-109
Author(s):  
Akaash K. Mishra ◽  
Jan Hellert ◽  
Natalia Freitas ◽  
Pablo Guardado-Calvo ◽  
Ahmed Haouz ◽  
...  

2022 ◽  
pp. 105244
Author(s):  
Sergio E. Rodriguez ◽  
David W. Hawman ◽  
Teresa E. Sorvillo ◽  
T. Justin O'Neal ◽  
Brian H. Bird ◽  
...  

Cells ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 8
Author(s):  
Sara Lado ◽  
Jan Futas ◽  
Martin Plasil ◽  
Tom Loney ◽  
Pia Weidinger ◽  
...  

Dromedaries are an important livestock, used as beasts of burden and for meat and milk production. However, they can act as an intermediate source or vector for transmitting zoonotic viruses to humans, such as the Middle East respiratory syndrome coronavirus (MERS-CoV) or Crimean–Congo hemorrhagic fever virus (CCHFV). After several outbreaks of CCHFV in the Arabian Peninsula, recent studies have demonstrated that CCHFV is endemic in dromedaries and camel ticks in the United Arab Emirates (UAE). There is no apparent disease in dromedaries after the bite of infected ticks; in contrast, fever, myalgia, lymphadenopathy, and petechial hemorrhaging are common symptoms in humans, with a case fatality ratio of up to 40%. We used the in-solution hybridization capture of 100 annotated immune genes to genotype 121 dromedaries from the UAE tested for seropositivity to CCHFV. Through univariate linear regression analysis, we identified two candidate genes belonging to the innate immune system: FCAR and CLEC2B. These genes have important functions in the host defense against viral infections and in stimulating natural killer cells, respectively. This study opens doors for future research into immune defense mechanisms in an enzootic host against an important zoonotic disease.


Vaccines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1491
Author(s):  
Thomas Tipih ◽  
Mark Heise ◽  
Felicity Jane Burt

Crimean–Congo hemorrhagic fever virus (CCHFV) infrequently causes hemorrhagic fever in humans with a case fatality rate of 30%. Currently, there is neither an internationally approved antiviral drug nor a vaccine against the virus. A replicon based on the Sindbis virus vector encoding the complete open reading frame of a CCHFV nucleoprotein from a South African isolate was prepared and investigated as a possible candidate vaccine. The transcription of CCHFV RNA and recombinant protein production by the replicon were characterized in transfected baby hamster kidney cells. A replicon encoding CCHFV nucleoprotein inserted in plasmid DNA, pSinCCHF-52S, directed transcription of CCHFV RNA in the transfected cells. NIH-III heterozygous mice immunized with pSinCCHF-52S generated CCHFV IgG specific antibodies with notably higher levels of IgG2a compared to IgG1. Splenocytes from mice immunized with pSinCCHF-52S secreted IFN-γ and IL-2, low levels of IL-6 or IL-10, and no IL-4. No specific cytokine production was registered in splenocytes of mock-immunized mice (p < 0.05). Thus, our study demonstrated the expression of CCHFV nucleoprotein by a Sindbis virus vector and its immunogenicity in mice. The spectrum of cytokine production and antibody profile indicated predominantly Th1-type of an anti-CCHFV immune response. Further studies in CCHFV-susceptible animals are necessary to determine whether the induced immune response is protective.


Vestnik ◽  
2021 ◽  
pp. 319-322
Author(s):  
Г.Н. Абуова ◽  
Т.В. Полукчи ◽  
Ф.А. Бердалиева ◽  
Д.С. Алиев ◽  
Э.Ю. Алиев

Проведен анализ литературных данных о применении плазменной терапии при лечении Конго-Крымской геморрагической лихорадки в мире. Данный обзор проведен для оценки эффективности плазменной терапии у пациентов с Конго-Крымской геморрагической лихорадкой на основе научных данных, опубликованных до настоящего времени. В последние годы отмечается определенный интерес к изучению плазменной терапии при лечении пациентов с Конго-Крымской геморрагической лихорадкой, хотя в литературе имеются лишь ограниченные данные по эффективности иммунотерапии и применения рибавирина при Конго-Крымской геморрагической лихорадке, при этом действенность рибавирина остается еще не доказанной. Однако можно предположить, что помимо противовирусных препаратов, применение плазменной терапии у больных с Конго-Крымской геморрагической лихорадкой может быть эффективным способом лечения, улучшающим клинические симптомы у пациентов, прогноз и снижающим смертность. The analysis of the literature data on the using of plasma therapy in the treatment of Congo-Crimean hemorrhagic fever was carried out. This review was conducted to evaluate the effectiveness of plasma therapy in patients with Congo-Crimean hemorrhagic fever on the basis of publications published so far. In recent years, there has been some interest in studying plasma therapy in the treatment of patients with Congo-Crimean hemorrhagic fever, although there are only limited data in the literature on the effectiveness of immunotherapy and the use of ribavirin in therapy, while the effectiveness of ribavirin remains not yet proven. However, it can be assumed that in addition to antiviral and antibacterial drugs, the use of plasma therapy in patients with Congo-Crimean hemorrhagic fever can be an effective treatment method that improves clinical symptoms in patients and reduces mortality.


Vestnik ◽  
2021 ◽  
pp. 323-329
Author(s):  
Г.Н. Абуова ◽  
Т.В. Полукчи ◽  
Ф.А. Бердалиева ◽  
Д.С. Алиев ◽  
Л.Л. Сарыпбекова ◽  
...  

Вирус Конго-Крымской геморрагической лихорадки является возбудителем тяжелой клещевой, часто смертельной, Конго-Крымской геморрагической лихорадки, которая широко распространена во всем мире. Передача вируса Конго-Крымской геморрагической лихорадки к человеку происходит через укус клеща, раздавливание зараженных клещей или контакт с инфицированной кровью человека. Миграция вируса способна через клещей с животными и перелетных птиц, в связи с чем имеется возможность исследования географического распространения посредством генетического анализа. В этом обзоре мы стремимся обобщить самые последние данные о генетическом разнообразии вирусов Конго-Крымской геморрагической лихорадки, циркулирующих в мире. Временной и пространственный анализ многообразия штаммов вируса может послужить ключевым фактором для лучшего понимания связи серопозитивности и уровня летальности. The Crimean-Congo hemorrhagic fever virus is the causative agent of severe tick-borne, often fatal, zoonotic Crimean-Congo hemorrhagic fever, which is widespread throughout the world. Transmission of the Crimean-Congo hemorrhagic fever virus to humans occurs through a tick bite, crushing of infected ticks or contact with infected host blood. The migration of the virus is possible through ticks with animals and migratory birds, and therefore it is possible to study the geographical distribution through genetic analysis. In this review, we aim to summarize the latest data on the genetic diversity of the Crimean-Congo hemorrhagic fever viruses circulating in the world. The temporal and spatial analysis of the diversity of virus strains can serve as a key factor for a better understanding of the relationship between seropositivity and the mortality rate.


Pathogens ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1613
Author(s):  
Marvin Collen Phonera ◽  
Martin Chitolongo Simuunza ◽  
Henson Kainga ◽  
Joseph Ndebe ◽  
Mwelwa Chembensofu ◽  
...  

Crimean-Congo hemorrhagic fever virus (CCHFV) is endemic in Africa, Asia, and Eastern Europe where it circulates among animals and ticks causing sporadic outbreaks in humans. Although CCHF is endemic in sub-Saharan Africa, epidemiological information is lacking in many countries, including Malawi. To assess the risk of CCHF in Malawi, we conducted an epidemiological study in cattle reared by smallholder livestock farmers in central Malawi. A cross-sectional study was conducted in April 2020 involving seven districts, four from Kasungu and three from Lilongwe Agriculture Development Divisions. A structured questionnaire was administered to farmers to obtain demographic, animal management, and ecological risk factors data. Sera were collected from randomly selected cattle and screened for CCHF virus (CCHFV) specific antibodies using a commercial ELISA kit. Ticks were collected from cattle and classified morphologically to species level. An overall CCHFV seropositivity rate of 46.9% (n = 416; 95% CI: 42.0–51.8%) was observed. The seropositivity was significantly associated with the age of cattle (p < 0.001), sex (p < 0.001), presence of ticks in herds (p = 0.01), district (p = 0.025), and type of grazing lands (p = 0.013). Five species of ticks were identified, including Hyalomma truncatum, a known vector of CCHFV. Ticks of the species Hyalomma truncatum were not detected in two districts with the highest seroprevalence for CCHF and vector competency must be further explored in the study area. To our knowledge, this is the first report of serologic evidence of the presence of CCHV among smallholder cattle in central Malawi. This study emphasizes the need for continued monitoring of CCHFV infection among livestock, ticks, and humans for the development of data-based risk mitigation strategies.


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