French authorities have detected the first known human case of Shamonda virus in a patient who died in early October, a finding that turns a virus long seen only in animals into a documented human infection for the first time. Health officials described it as an exceptional case in a severely immunocompromised patient.
The case is being watched closely because Shamonda virus had previously been identified in cattle and other animals, not people. French officials said there was currently no risk to the public, and the World Health Organization and the European Centre for Disease Prevention and Control said they were monitoring the situation.
The patient was being treated for a serious illness in a Lyon hospital and later experienced neurological complications thought to have been very likely linked to the virus based on initial findings. Officials said the patient’s immune system was weakened, leaving them more vulnerable to getting ill. The World Health Organization confirmed this was the first documented human case of the disease and said current information suggested the case was isolated and unlikely to lead to wider spread at this time.
French officials are still investigating how the virus spread to a human. It was thought the patient contracted Shamonda virus through a midge bite in eastern France, where cases were first identified in animals in the spring. On Thursday, French health and agriculture ministries said the patient probably contracted the virus through a midge bite in eastern France, but that remains a theory rather than a settled answer.
That uncertainty matters because the virus was long considered non-transmissible to humans despite decades of circulation in Africa and Asia. By late July, the first cases in Europe had already been identified, and the virus has since been detected in farm animals in Ireland, Germany, Italy and Spain, as well as in Jersey. In animals, the infection can cause fever, diarrhoea and poor milk production in dairy herds.
For now, officials say the case remains isolated and the public risk is low, but the unanswered question is how a virus that had only been identified in animals crossed into a human patient at all. The answer to that will shape whether this stays a one-off event or becomes the first warning sign of something broader.
