French health officials on Thursday confirmed that they had detected the Shamonda virus in a human — who died early this month — in what they say was the first-ever case of a human contracting the livestock disease.
"Despite circulating in Africa and Asia for several decades, the Shamonda virus has never previously been detected in humans," said France's Ministries of Health and of Agriculture in a joint statement.
"No health risk to the general public identified at this time," they said, adding that the human infection appeared to be, "an exceptional case involving a severely immunocompromised patient."
The World Health Organization (WHO) said the virus was unlikely to spread.
"Based on current information and knowledge of the transmission of closely related viruses, this is an isolated human case and it is unlikely to lead to wider spread at this time," WHO told Reuters in a statement.
How is Shamonda virus transmitted?
First identified in Nigeria in the mid-1960s, the insect-borne Shamonda virus is a variant of the Orthobunyavirus, a genus that contains 138 species, and primarily affects livestock, particularly cattle.
It is transmitted by culicoides, or biting midges.
The virus has been detected in animals in Africa and Japan for years and has been spreading across Europe this year.
Until now, it was not thought to be transmissible to humans.
According to a press statement on the Ministry of Agriculture's webpage, "At this stage of the investigation, the hypothesis is that the case resulted from vector-borne transmission via the bite of a culicoid midge in eastern France, a region where the virus was reported to be circulating among animals in the spring and summer of 2026."
The ministry said biological, clinical and epidemiological investigations are being carried out by experts in human, animal and environmental health, adding that authorities at the WHO and European Center for Disease Control had been notified of the incident.
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Edited by: Sean Sinico