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Drivers of Crimean-Congo Hemorrhagic Fever in Natural Host and Effects of Control Measures, Bulgaria
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Drivers of Crimean-Congo Hemorrhagic Fever in Natural Host and Effects of Control Measures, Bulgaria
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Journal Article
Drivers of Crimean-Congo Hemorrhagic Fever in Natural Host and Effects of Control Measures, Bulgaria
2025
Overview
Crimean-Congo hemorrhagic fever (CCHF) is an emerging tickborne disease and a World Health Organization priority. Although humans are accidental hosts, infection can lead to hemorrhagic fever with a high fatality rate. Domestic animals play a critical role in disease transmission, but infected animals do not show clinical signs and viremia is short; thus, CCHF virus (CCHFV) infections can remain unobserved. During 2017-2019, we conducted 2 sequential observational studies followed by a multisite randomized controlled trial to determine spatial-temporal patterns and quantify drivers for CCHFV exposure in a natural host (sheep) in a CCHF-endemic area of Bulgaria. We found high-risk areas embedded in endemic regions. Animal characteristics were not correlated with seropositivity; however, a seasonality effect was observed, suggesting sampling time was a potential confounder. Force of infection varied across farms and over time. CCHFV transmission heterogeneity among farms is driven by preventive measures used to reduce exposure to ticks.
Publisher
U.S. National Center for Infectious Diseases,Centers for Disease Control and Prevention
Subject
/ Analysis
/ Animals
/ CCHFV
/ Control
/ Crimean-Congo hemorrhagic fever
/ Crimean-Congo hemorrhagic fever virus
/ Farms
/ Hemorrhagic Fever Virus, Crimean-Congo
/ Hemorrhagic Fever, Crimean - epidemiology
/ Hemorrhagic Fever, Crimean - prevention & control
/ Hemorrhagic Fever, Crimean - transmission
/ Hemorrhagic Fever, Crimean - veterinary
/ Hemorrhagic Fever, Crimean - virology
/ Humans
/ Serology
/ Sheep
/ Vaccines
/ viruses
/ zoonoses
