News|Articles|October 27, 2026

FAQ: Shamonda Virus

As France confirms the first documented human Shamonda virus infection, a fatal encephalitis in a stem cell transplant recipient, this FAQ explains what the virus is, where it has spread, how the case was diagnosed, how the patient was likely infected and what clinicians should watch for.

On October 22, 2026, French health authorities announced the first documented human infection with Shamonda virus (SHAV), a midge-borne orthobunyavirus previously known to infect only animals.¹ The patient, who was severely immunocompromised and under care at the Hospices Civils de Lyon, died in early October.² A rapid communication in Eurosurveillance identified the strain as Shamonda virus Europe 1 (SHAV-EU1) and attributed the patient's fatal encephalitis to the infection.³

Related to this article

ID Week Highlights Part 1
In this first IDWeek 2026 roundup, oral olorofim matched AmBisome in invasive aspergillosis, aztreonam-avibactam held activity as MBL-producing CRE rose, pritelivir cut hospitalizations in refractory HSV, and zelicapavir shortened RSV symptoms in high-risk adults.
Pfizer 25-Valent Pneumococcal Vaccine Boosts Serotype 3 Response in Infants
Alejandra Gurtman, MD, discussed the phase 2 data at IDWeek 2026 which showed the investigational 25-valent pneumococcal conjugate vaccine 25vPnC produced serotype 3 antibody levels about 15-fold higher than Prevnar 20 after the booster dose, targeting a serotype still behind 10.6% of invasive pneumococcal disease in US children younger than five years.