French health authorities confirmed the first documented human infection with the Shamonda virus in October 2026, involving a severely immunocompromised patient in Lyon who died earlier that month. Officials stress that no risk to the general public has been identified, while international health bodies monitor the situation.
French health officials announced the finding after investigating the death of a patient who was already receiving treatment for a serious illness at a hospice in Lyon. The Shamonda virus, an insect-borne pathogen historically known to affect livestock, has crossed into a human for the first documented time.
Although the virus has circulated among animals in parts of Africa and Asia for decades, no human cases had ever been documented anywhere in the world until now.
Clinical Findings In Lyon
The patient was admitted to the Hospices Civils de Lyon hospital group with severe immunodeficiency. Medical teams noted that the individual died in early October. Preliminary examinations point to neurological complications as a primary factor in the outcome.
The neurological complications observed in the immunocompromised patient prior to his death are very likely linked to infection with the Shamonda virus.
French authorities, via Agence France-Presse and Rte
The French Agriculture Ministry and health authorities emphasized in a joint statement that clinical, biological and epidemiological investigations are still ongoing
to determine the exact extent to which the virus contributed to the patient’s death.
Spread Across Europe
Shamonda belongs to the Orthobunyavirus group, which includes related animal pathogens such as the Schmallenberg virus and Akabane virus. It is transmitted primarily by tiny biting insects known as Culicoides biting midges.
The virus was first identified in Nigeria in the mid-1960s and later reported across parts of Africa and Japan. It did not appear in Europe until the summer of 2026. Veterinarians and researchers subsequently tracked infections across multiple European countries, including dairy herds in France, Germany, and Switzerland.
In animals, particularly cattle, the infection typically causes fever, acute diarrhea, lethargy, and a substantial reduction in milk production. Smaller ruminants, horses, and alpacas have also exhibited sporadic infections during the seasonal spread.
Public Health Assurances
Officials stated that there is no health risk to the general public identified at this time. Following the confirmation of the human case, French ministries issued categorical assurances to calm public anxiety, noting that the infection appears to be an isolated occurrence driven by the patient’s severely compromised immune system.
Epidemiologists believe the patient likely contracted the pathogen via a midge bite while in eastern France, where animal outbreaks occurred during the spring and summer months.
European monitoring networks have tracked the virus across 14 western European countries.
Agricultural departments in other jurisdictions—such as Ireland, where cattle samples tested positive in County Cork—have begun tracking the emergent strain.
Both the World Health Organization and the European Centre for Disease Prevention and Control have been formally informed of the incident as laboratory teams continue their biological analysis.