# Explained: Shamonda, a midge-borne livestock virus, infects a human for the first time

URL: https://upsc.help/current-affairs/2026-10-24/shamonda-virus-first-human-case/
Date: 24 October 2026 (2026-10-24)
Source: Indian Express, Explained
UPSC papers: GS3, GS2
Publisher: upsc.help (Pratidin), free and open-source UPSC Civil Services current affairs. Not affiliated with UPSC. Every fact was checked against the source reports by a separate review before publishing.

**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.

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:

(a) Aedes mosquitoes
(b) Culicoides biting midges
(c) Ixodid ticks
(d) Sand flies of the genus Phlebotomus

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.

## UPSC previous-year questions this connects to

- UPSC Mains 2020, GS2: Critically examine the role of WHO in providing global health security during the COVID-19 Pandemic. (https://upsc.help/pyq/q336-role-who-providing-global-health-security-during/)
  How to use this story in the answer: Use the Shamonda case as a recent example of prompt notification to the WHO and of WHO engagement on a newly emerging human infection.
- UPSC Mains 2015, GS3: Livestock rearing has a big potential for providing non-farm employment and income in rural areas. Discuss suggesting suitable measures to promote this sector in India. (https://upsc.help/pyq/q315-livestock-rearing-has-big-potential-providing-non-farm/)

## 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.

## 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.

## 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.

## 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.

## Sources

- https://www.santepubliquefrance.fr/index.php/les-actualites/virus-shamonda-un-premier-cas-humain-detecte-en-france-que-sait
- https://ny1.com/nyc/all-boroughs/ap-top-news/2026/10/22/france-reports-first-human-case-of-livestock-virus-shamonda-in-patient-who-later-died
- https://aljazeera.com/news/2026/10/22/france-reports-first-human-shamonda-virus-case-says-no-health-risk
- https://www.nfuonline.com/news/new-shamonda-virus-strain-essential-information/
- https://wwwnc.cdc.gov/eid/article/18/10/12-0835_article.htm
- https://superkalam.com/current-affairs/24-10-2026/the-signs-and-science-of-the-shamonda-virus-pg17-72af206f-97bd-428a-a2be-49d8af5c4896