
French health authorities reported the first case of the Chamonda virus in a human on Thursday, after a patient died in early October.
France's Health Ministry said authorities reported an infection with the Chamonda virus in a patient with "severe immunodeficiency" who was receiving treatment for a serious illness at the Hospices Civils de Lyon in the country's third-largest city.
They said the patient passed away in early October and that clinical, biological and epidemiological investigations are ongoing.
"The Shamonda virus was previously considered not transmissible to humans. Therefore, the infection in this patient constitutes the first documented and reported detection of the virus in a human," the ministry said in a statement.
She said no human cases have been documented before, despite several decades of circulation in Africa and Asia.
"Therefore, this is an exceptional case involving a severely immunocompromised patient," the statement added.
She reaffirmed that no health risk to the general population has been identified so far.
The ministry said the virus was first identified in Europe this summer, including France, on cattle farms. Cattle are considered the main hosts among the animal species that can be infected.
"At this stage of the investigation, the hypothesis is that the patient was infected through vector transmission, through the bite of a Culicoides mosquito in eastern France, a region where the virus was circulating among animals in the spring and summer of 2026," she added.