Shamonda virus belongs to the orthobunyavirus family. It is transmitted by small biting insects, notably midges of the genus Culicoides. First identified in Nigeria in the mid-1960s, it has been circulating among livestock, mainly cattle, for several decades. Its presence had so far been reported in several regions of Africa as well as in Japan. It was not considered transmissible to humans.
In cattle, infection can cause fever, acute diarrhea, significant fatigue and reduced milk production. Some consequences remain poorly understood, notably the possible long-term effects on animal fertility. The disease is not currently subject to specific health regulations.
The virus was first detected on the European continent at the end of July 2026. Since then, its spread has been rapid. According to data from the French animal health epidemiological surveillance platform (ESA), 14 Western European countries are now concerned, including Luxembourg. In France, the virus has been identified in cattle in 52 departments. Infections were also reported in sheep in two departments and in horses in another.
According to the French Research Institute for Agriculture, Food and the Environment (Inrae), weather conditions favorable to the proliferation of insect vectors could explain this rapid spread.
The first documented human case concerns a severely immunocompromised patient who died after being treated in Lyon. The French authorities favor the hypothesis of transmission by the bite of an infected midge in eastern France, where the virus was already circulating among animals in the spring and summer of 2026.
This is the first officially reported human infection with Shamonda virus. Authorities have not released details about the patient’s occupation or the exact circumstances of his exposure.
At this stage, French health authorities have not identified any particular risk for the general population. They underline the exceptional nature of this first case, which occurred in a person whose immune defenses were greatly weakened. But scientific knowledge remains limited.
Professor Tom Solomon, specialist in emerging infections at the University of Liverpool, recalls that several questions remain unanswered. In particular, it is unknown whether healthy people can contract the virus without showing symptoms, what clinical manifestations it could cause and to what extent it can lead to serious complications.
French authorities informed international health organizations of this first human infection. Medical, biological and epidemiological investigations are continuing to better understand the circumstances of the contamination and the possible risks. For Tom Solomon, there is no reason to panic. This case, however, serves as a reminder of the need to monitor emerging infectious diseases, particularly those likely to affect the nervous system.
The main challenge now is to determine whether this human contamination constitutes an isolated event or reveals a hitherto unknown transmission capacity of the virus.
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