Explained: Shamonda, a midge-borne livestock virus, infects a human for the first time
In one line: A severely immunocompromised patient in Lyon became the first known human infected with Shamonda, a livestock virus carried by biting midges, and died in early October 2026.
Published 24 October 2026. Written by Pratidin from the reports linked at the end; every fact checked by a separate review before publishing. How we work
French health authorities reported on Thursday, 22 October 2026, the first known human infection with Shamonda virus, a pathogen of livestock spread by biting midges. The patient, severely immunocompromised and treated at the Hospices Civils de Lyon for a serious neurological condition, died in early October. Authorities were informed of the infection on 7 October. Laboratory tests found the virus in several biological samples, and full genome sequencing is under way to compare it with animal strains in the area. The leading hypothesis is a bite from an infected midge in eastern France, where the virus had circulated among animals in spring and summer. Until now, Shamonda was considered unable to infect humans.
The French Health Ministry called it an "exceptional case involving a severely immunocompromised patient" and said it had identified no risk to the general population; Santé publique France said no human-to-human transmission has been found. WHO Director-General Tedros Adhanom Ghebreyesus said the patient "was in an area where the Shamonda virus was circulating in animals." France notified the WHO and the European Centre for Disease Prevention and Control. Investigations follow a One Health approach, which links human, animal and environmental health.
Shamonda is an orthobunyavirus, an RNA virus, first detected in Nigeria in the 1960s and later reported sporadically in Africa and Japan. A new lineage, called Shamonda-Europe, was first confirmed in Europe in late July 2026 in sick cattle in southern Germany, Switzerland and eastern France, and has since been detected in several other European countries. In France, as of 20 October, it had been found in cattle in 52 departments, in sheep in two and in one horse. In ruminants it causes fever, diarrhoea, a fall in milk yield, abortions and birth defects. There is no vaccine. The case matters beyond Europe because it shows how an animal virus carried by insects can spill over into people, especially those with weak immunity.
Prelims facts
- France reported the first known human Shamonda virus infection on 22 October 2026; the severely immunocompromised patient died in Lyon in early October.
- Shamonda is an orthobunyavirus spread to animals by Culicoides biting midges; it was first detected in Nigeria in the 1960s.
- A new Shamonda-Europe lineage was first confirmed in European cattle in late July 2026; by 20 October it was in cattle in 52 French departments.
- French authorities found no risk to the general population and no human-to-human transmission; there is no vaccine for animals.
- Shamonda belongs to the Simbu serogroup, the same group as Schmallenberg virus, which emerged in Europe in 2011.
Quick recall
- When did France report the first human Shamonda case?
- Thursday, 22 October 2026.
- Which insect spreads Shamonda virus?
- Biting midges of the genus Culicoides.
- Where was Shamonda first detected?
- Nigeria, in the 1960s.
- To which virus group does Shamonda belong?
- Orthobunyavirus, Simbu serogroup.
- Name a close relative of Shamonda that emerged in Europe in 2011.
- Schmallenberg virus.
- What is the new European lineage called?
- Shamonda-Europe.
- In how many French departments had cattle tested positive by 20 October 2026?
- 52.
- Is there a vaccine for Shamonda?
- No; control rests on surveillance and limiting midge exposure.
Prelims practice question
Shamonda virus, recently in the news after its first reported human case, is transmitted mainly by:
- Aedes mosquitoes
- Culicoides biting midges
- Ixodid ticks
- Sand flies of the genus Phlebotomus
Show answer
Answer: (b) Culicoides biting midges. Shamonda virus spreads among animals, mainly cattle, through the bites of midges of the genus Culicoides. The French patient is believed to have been infected by a midge bite in eastern France.
Use this in UPSC Mains: previous-year questions
Recurring theme: Emerging zoonotic and vector-borne diseases and global health security
Critically examine the role of WHO in providing global health security during the COVID-19 Pandemic.
How to use thisUse the Shamonda case as a recent example of prompt notification to the WHO and of WHO engagement on a newly emerging human infection.
- France reported the first human Shamonda case on 22 October 2026 and notified the WHO and the ECDC.
- The WHO chief publicly linked the case to the virus circulating in animals, supporting a One Health response.
Shamonda's effects on cattle, including lower milk yield, abortions and birth defects, show why animal disease control is part of promoting livestock rearing.
Mains practice question
The first human case of Shamonda virus shows how animal pathogens can cross into people. Explain the factors behind such spillovers and how a One Health approach helps manage them. (150 words)
Model answer
Shamonda, a midge-borne livestock virus long thought unable to infect people, was found in a severely immunocompromised patient who died in Lyon in October 2026, France's first known human case.
Factors behind spillover
- Vector spread: Culicoides midges carry the virus between animals; a new Shamonda-Europe lineage spread rapidly across Europe from July 2026.
- High exposure: the patient lived where the virus circulated in animals and midges were present.
- Host vulnerability: severe immunosuppression made infection and severe disease more likely.
- Wide animal reservoir: cattle in 52 French departments, plus sheep and a horse.
One Health response
- France's investigation combines human, animal and environmental health expertise.
- Joint surveillance: animal health bulletins plus human testing by national reference centres.
- Vector control and herd monitoring, since no vaccine exists.
- Early notification to WHO and the ECDC.
Integrating veterinary and human surveillance is the most practical defence against the next spillover.
The basics
Why this matters
Most new human infections come from animals. The Shamonda case is a small, clear example of how that happens: a virus of cattle, carried by a tiny insect, finds a person whose immune system cannot fight back. UPSC asks about emerging diseases, vector-borne infections, global health bodies and the One Health idea, and this case touches all of them.
What kind of virus is Shamonda?
Shamonda is an Orthobunyavirus: an RNA virus whose genome comes in three segments. It belongs to the Simbu serogroup, the same group as Schmallenberg virus, which was discovered in Europe in October 2011 and also caused birth defects in livestock.
- 1GenomeNegative-sense RNA in three segments: large (L), medium (M) and small (S)
- 2GroupOrthobunyavirus of the Simbu serogroup, related to Schmallenberg virus
- 3VectorCulicoides biting midges
- 4Main hostsCattle, also sheep, goats, horses and alpacas
How it reaches animals, and rarely people
The virus does not spread directly from cow to cow; there is currently no evidence of that. It moves through Culicoides biting midges, which feed on an infected animal and then bite another. The French patient most likely met an infected midge in eastern France.
- 1Virus circulates in the blood of cattle or sheep
- 2A Culicoides midge takes up the virus with a blood meal
- 3The virus replicates inside the insect
- 4The midge infects another animal, or rarely a person
From Nigeria to Lyon
Shamonda was first detected in Nigeria in the 1960s and later reported sporadically in Africa and Japan. A new lineage, Shamonda-Europe, appeared in European cattle in summer 2026.
- 1960sFirst detected in Nigeria
- October 2011Related Schmallenberg virus discovered in Europe
- Late July 2026Shamonda first confirmed in Europe in cattle in Germany, Switzerland and France
- 7 October 2026French authorities informed of a human infection in Lyon
- 22 October 2026France reports the first known human case
What it does in animals
In ruminants it causes fever, diarrhoea, a drop in milk yield, abortions and birth defects. It has also been found in the nervous system of horses with neurological signs. There is no vaccine and no specific antiviral, so control rests on watching herds and limiting midge exposure.
Should people worry?
French authorities found no risk to the general population and no human-to-human spread. The patient's severe immunosuppression was central. But the case shows why Zoonoses and One Health thinking matters: human, animal and environmental surveillance work best together, an approach that bodies like the World Organisation for Animal Health promote.
Go deeper
Why it matters for UPSC
GS3 science and GS2 health questions often turn on emerging infections, vectors and global health governance. Prelims likes to ask which vector spreads which disease.
The core idea
Shamonda is an Orthobunyavirus that circulates in cattle and other ruminants. It moves between animals through Culicoides biting midges. A new European lineage spread fast in 2026, and one bite appears to have infected a person whose immune system was very weak. The case is a textbook illustration of Zoonoses and One Health: an animal disease, an insect vector and a vulnerable human host, investigated jointly by human, animal and environmental health experts, with standards on animal disease set by the World Organisation for Animal Health.
Numbers and dates to remember
- 1960s: first detected in Nigeria.
- Late July 2026: first confirmed in Europe.
- 7 October 2026: French authorities informed; 22 October: first human case reported.
- 52: French departments with infected cattle as of 20 October 2026.
- 0: vaccines available.
Where to go next
- Orthobunyavirus: what kind of virus this is.
- Culicoides biting midges: the insect that carries it.
- Zoonoses and One Health: why animal diseases are a human concern.
- World Organisation for Animal Health: the global body for animal disease.
Go deeper: one case, three lessons
Lesson one: 'not transmissible to humans' is provisional. Before October 2026, Shamonda was considered unable to infect people. A single case in a severely immunocompromised patient has changed that. Experts stress that this does not mean healthy people are at risk: the French Health Ministry called it an exceptional case. But it shows that statements about which species a virus can infect rest on what has been observed so far.
Lesson two: vectors move with climate and trade. Culicoides biting midges are found widely, and the viruses they carry can spread quickly through livestock. Schmallenberg virus, a close relative in the same serogroup, emerged in Europe in 2011 and caused birth defects in livestock. Shamonda's European lineage was confirmed in July 2026 and had spread across many countries by October.
Lesson three: One Health is practical, not abstract. France's investigation pairs clinical work in hospitals with animal surveillance bulletins and environmental expertise. That is the essence of Zoonoses and One Health. Animal surveillance pointed to the likely source: the patient was in an area where the virus circulated in animals. The World Organisation for Animal Health sets global standards on animal disease.
The other side. Some argue that a single fatal case in a very vulnerable patient attracts more attention than it deserves. Authorities have been careful to say there is no wider public risk and no human-to-human spread. The balanced view is to keep surveillance high without alarm.
The science still open. Genome sequencing of the virus from the patient is under way to compare it with animal strains. Knowing the Orthobunyavirus family helps: their three-segment genomes can swap segments when two viruses infect the same host, which is one way new variants arise.
Orthobunyavirus
Understand the family of viruses Shamonda belongs to.
In one line: Orthobunyaviruses are RNA viruses with a three-segment genome, most of them spread by insects such as mosquitoes and midges.
The basics
Their genome is negative-sense RNA split into a large (L), medium (M) and small (S) segment. The L segment codes for the enzyme that copies the genome, the M segment for surface proteins, and the S segment for the protein that wraps the RNA. Because the genome is segmented, two related viruses infecting the same host can exchange segments, producing a reassortant virus.
The Simbu serogroup
Shamonda and Schmallenberg viruses belong to the Simbu serogroup of orthobunyaviruses. Schmallenberg was discovered in Europe in October 2011. A 2012 study proposed Schmallenberg as a possible ancestor of Shamonda.
Why it is in the news
Shamonda is the orthobunyavirus that caused the first human case in France in October 2026.
Where to go next
Culicoides biting midges
Meet the tiny insect that carries Shamonda between animals.
In one line: Culicoides are tiny biting midges that feed on the blood of animals and can carry viruses from one host to the next.
How they spread disease
A midge feeding on an infected animal takes up the virus, which multiplies inside it. When the midge bites again, it can pass the virus on. Outbreaks of midge-borne livestock viruses tend to follow the seasons when midges are active.
Shamonda and midges
Shamonda virus spreads to animals, mainly cattle, through Culicoides midges. There is currently no evidence of direct animal-to-animal spread. The WHO chief noted that the French patient was in an area where the virus circulated in animals.
Control
With no vaccine, control rests on reducing exposure to midges and monitoring herds.
Where to go next
Zoonoses and One Health
See why an animal virus is a human health issue.
In one line: Zoonoses are diseases that pass from animals to humans, and One Health is the approach of tackling human, animal and environmental health together.
Why animals matter for human health
Many emerging infections in people begin in animals. They may jump directly, through contact or food, or through vectors such as mosquitoes, ticks or midges. Whether a jump succeeds depends on the pathogen, the level of exposure and the health of the person exposed.
One Health in action
France's investigation into the Shamonda case follows a One Health approach linking human, animal and environmental health. Animal surveillance identified where the virus was circulating, which pointed to the likely source of the human infection.
Why it is in the news
Shamonda was considered non-transmissible to humans until October 2026, which shows why animal disease surveillance is also a public health tool.
Where to go next
World Organisation for Animal Health
Know the global body that sets standards on animal disease.
In one line: The World Organisation for Animal Health (WOAH) is the intergovernmental body, founded in 1924, that coordinates the control of animal diseases worldwide.
What it does
WOAH sets international standards for animal health, collects reports of animal disease outbreaks from member countries, and advises on prevention and control. It was founded as the Office International des Epizooties (OIE) and is headquartered in Paris.
Its place in One Health
Many animal diseases also threaten people, so animal disease reporting and control are a first line of defence for human health as well.
Why it is in the news
For midge-borne viruses such as Shamonda, where no commercial vaccine exists, guidance focuses on vector control and surveillance.
Where to go next
Take the 24 October 2026 quiz: 30 Prelims-style questions with answers