With only one human Shamonda virus case reported, health agencies have little evidence to define its effects, while France says it has found no sign of spread between people.
Santé publique France said it received notice Oct. 7 after tests found Shamonda in several samples from the patient. The patient was treated at Hospices Civils de Lyon for a serious neurological condition and was severely immunocompromised, the agency said. The patient died in early October. The French health ministry announced the country's first documented human detection of Shamonda on Oct. 22.
The World Health Organization (WHO) said the patient had been seriously ill before the infection, while additional brain symptoms were considered linked to Shamonda. “As only one human case has been reported so far, information on the disease in humans remains limited,” the WHO said in its Q&A.
The French health ministry said the patient's cerebral complications were very likely linked to the infection. The European Centre for Disease Prevention and Control (ECDC) says investigators have not established whether the virus caused or contributed to the death.
Santé publique France said it has found no evidence of human-to-human transmission or a wider risk to the population. French investigators are examining a possible bite by an infected Culicoides midge in eastern France as the leading explanation. They are also reviewing the patient's travel and surroundings, including possible contact with animals and insect vectors. The midge species has not been identified.
Santé publique France's Oct. 20 tally included cattle across 52 mainland departments, sheep in two departments and one horse. WHO says the virus was first isolated from cattle in Nigeria in 1965 and detected in European cattle in June 2026. Reported animal signs include fever, diarrhea, reduced milk production, abortions and congenital malformations; these do not establish a symptom profile in people. No treatments or vaccines are available, WHO says.
