PARIS — French medical authorities announced Thursday that the Shamonda virus has been identified in a human for the first time on record, following the death of an immunocompromised patient earlier this month.
The insect-borne pathogen typically infects livestock and had never previously been documented in people. French officials stressed that based on current scientific knowledge, the general public faces no health danger from the development, The Independent and The Jerusalem Post reported.
Infection Linked to Animal Outbreaks
The patient died in October while undergoing care for a severe illness at Hospices Civils de Lyon, according to the French Ministry of Agriculture. Officials noted that the individual had a heavily compromised immune system prior to contracting the infection.
Health investigators believe the patient likely contracted the virus in eastern France, an area where the pathogen had spread among farm herds during the spring and summer of 2026. Agriculture officials indicated that neurological complications observed in the patient were “very likely” connected to the infection, according to The Independent.
Authorities described the incident as an exceptional case tied directly to the patient’s vulnerable health status. “Despite decades of circulation of the Shamonda virus in Africa and Asia, no human cases had been documented until now,” the agriculture ministry said in a statement quoted by The Independent.
A History in Livestock
Shamonda belongs to the Orthobunyavirus genus within the Simbu serogroup and shares genetic similarities with the Schmallenberg virus. Biting midges spread the pathogen, which predominantly impacts cattle. Researchers first discovered it in Nigeria during the mid-1960s, and sporadic occurrences were subsequently registered across parts of Africa and Japan.
The virus had not been observed in Europe until earlier this year, when it surfaced on cattle operations across multiple countries. The U.K. Animal and Plant Health Agency confirmed in September that the virus had been found in cows on the island of Jersey over the summer months.
When livestock contract the infection, adult cattle frequently develop sudden fever, loose stool and abdominal distress, according to British veterinary officials. Agricultural records show that while the virus is not generally fatal in mature cows, it can trigger miscarriages and congenital deformities in newborn calves. Veterinary specialists have also confirmed infections in sheep, goats, horses and alpacas.
Ongoing Inquiries
British agricultural agencies have advised farmers observing symptoms similar to Shamonda in their herds to reach out to local veterinary centers for diagnostic support and guidance.
In France, medical and epidemiological researchers are continuing clinical and laboratory inquiries into the circumstances surrounding the Lyon patient’s exposure and subsequent decline. Officials have not reported any other suspected or confirmed human infections, and surveillance across European livestock populations remains underway.
