Emergence of Shamonda Orthobunyavirus, Central Europe, 2026.

Since mid-June 2026, an acute, nonfatal syndrome characterized by high herd illness rate, reduced milk yield, diarrhea, fever, and lethargy has affected dairy cattle in southern Germany and Switzerland. After major viral pathogens were excluded, pan-Simbuvirus reverse transcription PCR detected an orthobunyavirus, confirmed by metagenomic sequencing, enabling recovery of a complete Shamonda virus genome.