First Human Case of Shamonda Virus Reported in France

First Human Shamonda Virus Death Recorded in Lyon

Francia informó sobre el primer caso documentado de infección humana por el virus Shamonda después de que un paciente inmunodeprimido falleciera tras ser hospitalizado. The patient had been receiving treatment for a severe underlying illness that rendered them significantly more susceptible to infections than the general population. French health and agriculture ministries classified the event as exceptional. While the autopsy identified the presence of the pathogen in the patient’s system, officials stated that investigations are ongoing to determine whether the virus directly caused or merely contributed to the fatality, as well as how the infection occurred.

Shamonda Virus Spreads to European Livestock

The Shamonda virus belongs to the genus Orthobunyavirus and the Simbu serogroup, which also includes the Schmallenberg and Akabane viruses. Initially identified in cattle in Nigeria in 1965, the virus has historically circulated among ruminants including sheep, goats, horses, and alpacas. In animals, infections typically manifest as fever, diarrhea, reduced milk production, and congenital malformations in newborns. Until recently, the pathogen was largely confined to regions of Africa and Japan. However, it emerged in European livestock during the summer, spreading across countries such as Germany, Switzerland, Austria, Belgium, and Spain.

Culicoides Midges Transmit the Virus

The virus spreads primarily through the bites of midges belonging to the Culicoides genus. While animal-to-animal transmission is not known to occur outside of vertical transmission from an infected mother to a fetus, experts are examining how the human patient encountered an infected vector. Researchers note that changing climatic conditions and warming temperatures have altered ecological dynamics, expanding the geographic range and activity periods of vector insects across Europe. Despite this wider animal spread, public health agencies maintain that human susceptibility remains extremely low under normal conditions.

Health Authorities Monitor Isolated Human Case

The European Centre for Disease Prevention and Control is in direct communication with French authorities to monitor public health implications and evaluate laboratory biosafety requirements. At present, no commercial vaccines or specific antiviral treatments exist for the Shamonda virus. Health authorities reiterate that the public faces no generalized health threat, and the incident is viewed strictly as an isolated occurrence affecting a highly vulnerable individual. Further clinical, biological, and epidemiological evaluations remain underway to clarify the precise vector species and mechanism of transmission involved in the Lyon case.

Global Spread and Scientific Assessment

The virus was detected for the first time in Europe last summer in France, and has since been identified in livestock farms across Austria, Belgium, France, Germany, Ireland, Italy, Liechtenstein, Luxembourg, the Netherlands, Portugal, Spain, Switzerland, and Jersey. In Spain, the Ministry of Agriculture, Fisheries and Food confirmed its detection in cattle across seven farms in Córdoba and Toledo. Although expert virologists previously anticipated no human risk from this virus, bunyaviruses feature segmented RNA genomes and possess a very high mutagenic potential, as noted by José Francisco Ruiz Fons, a senior scientist at CSIC and member of the Health and Biotechnology Research Group (SaBio).

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