Shamonda Virus: First Case in France Prompts Morocco Watch
France announced its first human case of Shamonda virus, transmitted by biting midges, after a patient died in Lyon. A Moroccan doctor recommends preventive surveillance.
France announced on Thursday, October 22, 2026, the detection of its first human case of Shamonda virus, after the death of a severely immunocompromised patient treated in Lyon, who died in early October. Health authorities said the brain complications he suffered were "very likely" linked to the infection, while the investigation into how the infection occurred continues.
What is Shamonda virus?
First described in Nigeria in the 1960s, Shamonda virus belongs to the orthobunyavirus family and is transmitted through the bite of Culicoides biting midges. It mainly circulated among animals, especially cattle, before being recently detected in Europe, according to Dr. Tayeb Hamdi, a physician and health-policy researcher.
According to Hamdi, the French case was detected due to three factors: the patient's fragile immune state, modern genetic sequencing techniques capable of identifying rare or unexpected pathogens, and climate change, which may expand the range of vector insects and alter their activity periods.
No increased risk for the general population
French authorities said they had not recorded any increase in health risk for the general population, describing the case as "exceptional," specific to a particularly immune-vulnerable patient. Dr. Hamdi explains that normally low-virulence viruses can "multiply uncontrollably" in severely immunocompromised patients. No direct human-to-human transmission has been established so far, and human symptoms remain poorly documented since only one case exists, while in animals, infection can cause fever, lethargy and reduced milk production.
What experts recommend for Morocco
Dr. Hamdi calls for adopting a "One Health" approach, combining surveillance of human, animal and environmental health: veterinary surveillance of cattle and sheep farms to detect unusual fever, reproductive issues or atypical birth defects; mapping and trapping of vector insects; and alerting hospitals and infectious-disease departments to atypical infections, especially fever or neurological symptoms of unknown origin in immunocompromised patients.
He stresses that these recommendations "do not mean" that Shamonda virus is already circulating among humans in Morocco, but are preventive measures, in the absence of any official data on its presence in the Kingdom.