Surveillance data from ECDC’s European Respiratory Virus Surveillance Summary (ERVISS) platform and PAHO indicate continued co-circulation of influenza viruses, respiratory syncytial virus (RSV) and SARS-CoV-2 at the start of the 2025–26 Northern Hemisphere winter. In Europe, influenza A predominates with increasing hospitalizations among older adults, while RSV circulation is rising in several countries. SARS-CoV-2 activity persists at lower but stable levels. In the Americas, early-season increases in influenza and RSV activity have been reported following a severe 2025 Southern Hemisphere season.

CDC’s Vessel Sanitation Program reports an outbreak of acute gastroenteritis due to norovirus aboard the AIDAdiva during a journey from 10 November to 16 December 2025. The number of ill passengers exceeded the reporting threshold, prompting investigation and enhanced control measures.

ECDC reports at least 193 Shigella sonnei infections in travelers returning from Cabo Verde in 2025, with most cases linked to all-inclusive resorts in Sal and Boa Vista. The outbreak strain shows resistance to trimethoprim with limited additional resistance markers.

Shigellosis outbreaks in Cape Verde have been reported in recent years, including among travelers.

Ticino health authorities reported the first locally acquired human West Nile virus (WNF) infection in Switzerland on 4 December 2025, in a resident who developed meningoencephalitis after mosquito exposure during summer. Previous detections of WNV in mosquitoes in Ticino suggested an established seasonal risk.

Marburg virus outbreak in Ethiopia spreads from Jinka (southern Omo region, South Ethiopia Regional State) to Hawassa, Sidama Region, located over 300 km from Jinka.

Case update:

• 12 confirmed cases including 7 confirmed deaths.
• Further 78 suspected cases are under investigation. 

On 1 December 2025, the DRC Ministry of Health declared the end of the Ebola outbreak that began on 4 September 2025. The declaration followed two consecutive incubation periods (42 days) since the last confirmed patient tested negative and was discharged on 19 October.

The outbreak affected six health areas in Bulape Health Zone, Kasai Province, with 64 cases (53 confirmed, 11 probable) and 45 deaths (CFR 70.3%). This marks the DRC’s 16th Ebola outbreak.

Increased cases of rabies have been reported in animals and humans in Haiti. A case of rabies has been reported in the U.S. in a traveller from Haiti.

As of 24 November 2025:

• 10 cases of Marburg virus disease (MVD), including five deaths, have been confirmed in Jinka town, South Ethiopia Regional State. Five cases are currently receiving treatment (including one critically ill).
  
• Three additional MVD deaths are classified as probable cases (deaths before testing was available).
  
• More suspected MVD cases are still under investigations.
  
• More than 200 contacts have been identified.
  
• The source of the infection has not yet been identified. 
  

No international transmission has been confirmed, but the risk remains. Jinka, though far from Ethiopia’s capital and major airports, is connected by roads to neighbouring Kenya and South Sudan and is considered as a touristic destination, especially for travelers interested in culture and anthropology. For details on MVD, see Marburg virus disease factsheet.