Shamonda virus reported in France as patient dies: Why is it deadly, what are its symptoms, treatment and prevention methods?

Shamonda virus: France has reported the first known human case of the Shamonda virus, a disease previously identified mainly in livestock such as cattle, sheep, goats and horses, news agency Reuters reported. The patient, who had a serious underlying illness and a weakened immune system, died in early October. However, health authorities are still investigating whether the Shamonda virus directly caused or contributed to the death. They have also said that no risk to the general population has been identified so far. The case of Shamonda virus being reported in France comes at a time when the country is seeing massive protests by students against staff shortages in schools.

The Shamonda virus is transmitted by biting midges, tiny flying insects that can spread infections between animals. Authorities are investigating how the human infection occurred and what it could mean for public health. Here is what to know about the Shamonda virus, its symptoms, why it may be dangerous, available treatment options and prevention methods.

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What is the Shamonda virus and why is it dangerous?

The Shamonda virus belongs to the Orthobunyavirus group and the Simbu serogroup, reports Reuters. The virus was first identified in Nigeria in the 1960s and has been detected in animals in parts of Africa and Asia. In 2026, infections were identified in livestock in Europe, including Germany, Switzerland and France.

The main concern following the French case is that the virus has now been detected in a human for the first time. Initial investigations suggest that the patient experienced neurological or cerebral complications that were likely linked to the infection. The patient was severely immunocompromised, making it difficult to determine how the virus might affect someone with a stronger immune system.

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Does this mean the Shamonda virus is deadly?

Not necessarily. One reported human case is not enough to establish how dangerous the virus is to people or whether it can cause severe illness in otherwise healthy individuals. The patient was already seriously ill, and authorities have not confirmed that the virus caused the death. Health officials currently assess the risk to the general population as low.

In livestock, the Shamonda virus can cause illness across affected herds, although the 2026 European cattle outbreak described in a CDC journal report was nonfatal. Its effects can include reduced milk production, fever and diarrhoea.

What are the symptoms of the Shamonda virus?

The symptoms of the Shamonda virus in humans are not yet fully understood because this is the first documented human infection. Researchers need more evidence to establish how the infection develops and which symptoms it can cause in people.

In animals, particularly cattle, reported Shamonda virus symptoms include:

- Fever: An increase in body temperature during infection.

- Diarrhoea: Sometimes acute, potentially affecting the animal’s condition.

- Lethargy: Reduced activity and unusual tiredness.

- Reduced milk production: Dairy cattle may experience a significant drop in milk yield.

- Reproductive complications: Abortions and congenital abnormalities have been reported in livestock affected by related Shamonda-like viruses.

Is there a treatment or vaccine for the Shamonda virus?

There is currently no commercially available vaccine for the Shamonda virus, according to the World Organisation for Animal Health. There is also no established, virus-specific antiviral treatment available for human infection.

How can the Shamonda virus be prevented?

The Shamonda virus is transmitted by biting midges, so reducing exposure to these insects is an important precaution. However, prevention measures have not been specifically tested against human Shamonda virus infection. Practical precautions include:

- Avoid insect bites: Use suitable insect repellents according to their labels and wear long-sleeved clothing when exposure to biting insects is likely.

- Reduce insect exposure: Use well-maintained window screens and appropriate protective measures around homes and livestock facilities.

- Monitor livestock: Farmers should contact a veterinarian if cattle or other animals develop fever, diarrhoea, lethargy or an unexplained drop in milk production.

- Follow official guidance: People living in or travelling to affected areas should follow advice from local public health and veterinary authorities.