France has confirmed the world’s first documented human infection with the Shamonda virus after a patient died at a hospital in Lyon earlier this month.
French authorities announced the finding on Thursday, October 22, but stressed that there is currently no identified health risk to the general population.
According to Reuters, the virus was previously considered unable to infect humans. Its detection in a patient has prompted further investigations by French health officials and the World Health Organization (WHO).
The patient had a weakened immune system, which may have increased their vulnerability to infection and severe illness.
What is the Shamonda virus?
The Shamonda virus belongs to a group of viruses known as orthobunyaviruses.
It mainly affects animals, particularly cattle, and spreads through the bites of small insects called Culicoides midges.
Scientists first identified the virus in Nigeria during the 1960s.
Since then, researchers have occasionally detected it in eastern and southern Africa, as well as Japan.
Until the French case, health authorities had not documented a human infection.
The discovery has therefore raised new scientific questions about how the virus behaves and whether it can infect other people.
However, officials have not identified evidence of a wider public health threat.
Patient dies after infection in France
The patient died at a hospital in Lyon earlier in October.
French authorities believe the infection may have occurred in eastern France, where the virus circulated among animals during the spring and summer.
However, investigators have not yet established the exact source of the infection.
WHO Director-General Tedros Adhanom Ghebreyesus said the patient was immunocompromised.
This means their immune system was less able to fight infections.
Tedros also noted that the patient had been in an area where infected animals and Culicoides midges were present.
French officials described the death as an exceptional event that may have been influenced by the patient’s underlying health condition.
However, investigations are continuing to determine the virus’s role in the illness and death.
WHO investigates possible transmission
The WHO is working with French authorities to understand how the patient became infected.
Investigators are examining possible transmission routes and whether the virus presents any broader risk to humans.
The investigation involves specialists in human health, veterinary medicine and environmental science.
This approach reflects the close relationship between animal diseases, insect populations and human health.
However, health officials have not established that the Shamonda virus can spread between people.
They are also assessing whether the infection resulted from exposure to infected insects or another source.
For now, the WHO has not announced any evidence of sustained human transmission.
Shamonda virus detected across Europe
The virus was first confirmed in Europe in late July 2026.
Genetic testing identified it in sick cattle in southern Germany, Switzerland and eastern France.
Since then, animal health surveillance has detected the virus in several other European locations.
These include Austria, Belgium, Ireland, Italy, Liechtenstein, Luxembourg, the Netherlands, Portugal, Slovenia, Spain and Jersey.
The findings suggest that the virus has circulated more widely among European animals than previously recognised.
However, animal infections do not necessarily mean that humans face a significant risk.
Health authorities are continuing to monitor the situation.
France says there is no health crisis
Despite the first documented human infection, French officials have urged the public not to panic.
The Ministry of Agriculture said there was no identifiable risk to the general population at this stage.
Meanwhile, the Health Ministry said the case did not justify describing the situation as a public health crisis.
Officials stressed that the patient’s weakened immune system may have contributed to the unusual outcome.
However, they acknowledged that further research is needed.
The investigation will examine how the virus crossed from its usual animal hosts into a human patient.
It will also assess whether similar infections could occur under other circumstances.
For now, French and international health authorities are continuing surveillance while maintaining that there is no evidence of a wider outbreak.