We report an adenovirus outbreak with unusually severe clinical presentation, particularly in military conscripts and their close contacts. During 1 February-30 June 2024, 129 patients with adenovirus infection were hospitalised, 30 were admitted to ICU, 10 required ECMO treatment and six died. Cases consisted of 75 conscripts (58.1%) and 54 civilians (41.9%). Most samples were type 7 (97/108
89.8%)
all 24 sequenced samples were subtype 7d. During 1 August-30 November 2024, 274 additional hospitalised cases were identified from registries.