Shamonda Virus: Should We Worry?

The Shamonda virus, an insect-borne pathogen primarily affecting livestock, has drawn attention after France reported the first known human infection. Although the case has raised questions about its potential risks to people, health authorities have identified no wider public health threat.

What Is the Shamonda Virus?

Historically reported in parts of Africa and Asia, the virus was detected in European livestock in 2026, prompting increased surveillance of its spread and impact on animal health.

Shamonda belongs to the Orthobunyavirus group, alongside Schmallenberg virus, which causes reproductive disorders in livestock.

First identified in cattle in Nigeria in 1965, it primarily affects cattle but has also been detected in sheep, goats, horses and alpacas.

Previously reported in parts of Africa and Asia, the virus was detected in Europe for the first time in late July 2026. 

By October 20, cases had been reported in more than a dozen European countries, including major cattle producers France, Germany, Spain and Ireland. French authorities said the virus had likely been circulating in the country since spring, prompting increased surveillance of its spread and impact on livestock.

How Does It Spread?

The virus is transmitted by biting midges, particularly those belonging to the Culicoides genus, which can carry it between animals.

An infected midge bite is suspected in France's first reported human case, although the transmission route remains under investigation. There is currently no established evidence of human-to-human transmission.

The Toll on Livestock

Infected animals may develop fever, diarrhoea and reduced appetite, while cattle can experience lower milk production. 

More serious complications include abortions and severe foetal malformations, while neurological disorders have been reported in some horses. 

The World Organisation for Animal Health (WOAH) says the long-term impact of the virus’s European variants remains uncertain.

The Science Isn't Settled

The patient, who was severely immunocompromised, died in October, but investigations are ongoing to determine whether the infection contributed to the death.

With human infections previously undocumented, the virus’s effects on people and potential risk factors remain poorly understood.

Health authorities have identified no wider public health risk following France’s first reported human case of the Shamonda virus. However, the discovery highlights gaps in scientific knowledge about the virus's ability to infect humans and the severity of any resulting illness.

Shamonda is not a disease listed by the WOAH and countries are therefore not required to notify WOAH of cases under its disease-specific reporting ⁠obligations.

Researchers are investigating whether such infections are exceptionally rare or may have gone undetected, while surveillance focuses on livestock and the biting midges that transmit the virus.

What Comes Next?

Scientists and animal-health authorities will continue monitoring outbreaks, insect populations and potential changes in the virus's geographic spread.

For now, available evidence does not suggest an immediate public health threat. Further research will be essential to establish the risks to humans and improve understanding of the virus's impact on animals.