The world's most widespread tick-borne viral disease is expanding its reach

Health · Published 20 October 2026 Swipe more like this →

In short: Crimean-Congo hemorrhagic fever (CCHF) is a severe viral disease with a case fatality rate of up to 40%. While it is endemic across Africa, the Middle East, and Asia, it is now moving into Western Europe, posing a growing risk to livestock workers and healthcare systems.

CCHF is caused by a Nairovirus that cycles between ticks and a wide range of animals, including cattle, sheep, and goats. The primary vector is the Hyalomma tick, which can transmit the virus sexually and to its offspring. Once infected, these ticks carry the virus for life. In contrast, domestic ruminants act as 'amplifiers'—they carry the virus in their bloodstream for about one week without showing symptoms, allowing the tick-animal-tick cycle to continue unnoticed. Transmission to humans occurs primarily through tick bites or direct contact with infected blood and tissues, particularly during the slaughter of livestock. This makes agricultural workers, veterinarians, and slaughterhouse employees the highest-risk groups. Human-to-human transmission is also possible through close contact with bodily fluids or in healthcare settings where improper sterilization of medical equipment occurs. The virus is known for its sudden onset, often presenting with high fever, muscle aches, and severe symptoms like liver failure or rapid kidney deterioration after the fifth day of illness. While CCHF was first described in Crimea in 1944, its geographical footprint is expanding. It is now found in at least 55 countries. Notably, the virus reached the Iberian Peninsula in the 21st century, with Spain reporting its first autochthonous human case in 2016. By late 2023, officials detected the virus in ticks in France. Despite its severity, there is currently no specific approved treatment or widely available vaccine, though the antiviral ribavirin is sometimes used off-label with uncertain efficacy.

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