French health authorities have reported the first documented human infection with the Shamonda virus, a pathogen previously known to circulate primarily among animals. The patient, who was receiving treatment for a serious underlying illness, died in Lyon in early October.

Authorities have stressed that no health risk to the general population has been identified so far. Investigations are underway to determine how the infection occurred and whether the virus contributed to the patient’s death.

Patient Had a Severely Weakened Immune System

According to French authorities, the patient had severe immunodeficiency and was undergoing treatment for another serious medical condition.

The case is considered exceptional because no human infections had previously been documented, despite the virus circulating among animals for decades. Medical, laboratory and epidemiological investigations are continuing.

How Could the Virus Have Spread?

The initial hypothesis is that the patient may have contracted the virus through the bite of an infected *Culicoides* midge in eastern France, where the virus had been detected in animals earlier this year.

However, the exact route of infection has not yet been confirmed. Health authorities are continuing their investigation into the circumstances surrounding the case.

What Is the Shamonda Virus?

Shamonda is an orthobunyavirus first identified in Nigeria in the 1960s. It is primarily associated with livestock, particularly cattle, and is transmitted by tiny biting midges.

In infected cattle, symptoms may include fever, diarrhoea, weakness and reduced milk production. The virus was detected in livestock in parts of Europe, including France, Germany and Switzerland, during 2026.

Authorities Say Public Risk Remains Low

French authorities have emphasised that the reported infection is an exceptional case and that no risk to the general population has been identified at this stage.

The discovery has prompted further investigations into the virus’s ability to infect humans, the possible route of transmission and its potential health effects. Authorities are coordinating with relevant public health bodies as investigations continue.

The case has drawn international attention because it represents the first documented detection of Shamonda virus in a human. Scientists will need further evidence to establish the significance of this finding and assess any potential implications for public health.