May 2026 drew global attention to hantavirus after reports linked to a cruise ship. One thing helps right away: WHO, CDC, ECDC, and PAHO do not always show the same case count on the same day, because labs and line lists keep moving. Here we only restate what each agency actually published and link out so you can read the originals.
What WHO published first (4 May 2026, with a 5 May note)
WHO’s Disease Outbreak News dated 4 May 2026 described notification on 2 May 2026 of a cluster of severe respiratory illness aboard a Dutch-flagged cruise ship. As of 4 May 2026, WHO listed seven cases (two laboratory confirmed for hantavirus and five suspected), including three deaths, one critically ill patient, and three people with mild symptoms. WHO also stated the ship carried 147 people from 23 nationalities, departed Ushuaia, Argentina, on 1 April 2026, and as of 4 May was moored off Cabo Verde. WHO assessed global risk from the event as low while investigations continued. WHO noted a corrigendum on 5 May 2026 to clarify infection prevention and control wording. For the full narrative and case summaries, use WHO’s page directly.
What WHO said on 7 May 2026 (briefing update)
In a separate WHO news item dated 7 May 2026, WHO reported that eight cases had been reported so far, including three deaths, and that five of the eight cases had been confirmed as hantavirus. WHO identified the virus involved as Andes virus and quoted the Director-General that WHO assesses public health risk as low while noting that more cases could still appear given incubation periods.
What CDC published for the United States (8 May 2026)
CDC’s “Hantavirus: Current Situation” page dated 8 May 2026 states that CDC is responding to a deadly outbreak of Andes virus among passengers and crew of a cruise ship in the Atlantic Ocean, reported on 2 May 2026. CDC states that, to date, no cases of Andes virus have been reported in the United States as a result of this outbreak, and that overall risk to travelers and the American public remains extremely low. CDC also summarizes how Andes virus can spread person-to-person in limited circumstances compared with typical rodent-associated exposure.
What ECDC published for Europe and the ship (updated daily)
ECDC maintains a dedicated outbreak page titled “Andes Hantavirus outbreak in cruise ship, May 2026” that ECDC states is updated once daily. As of 9 May 2026 at 14:00 on that publication cycle, ECDC reported a total of eight cases: six confirmed and two probable, with three deaths. ECDC states the virus has been identified as Andes hantavirus, describes case definitions for suspected, probable, and confirmed cases, and assesses risk to the EU and EEA general population as very low. ECDC’s page also links to formal assessments and rapid scientific advice for passenger management.
What PAHO added for the Region of the Americas (7 May 2026)
On 7 May 2026 PAHO posted a news article about coordination and technical help on laboratory work, clinical care, and infection prevention and control. PAHO repeated that person-to-person spread with Andes hantavirus is rare and usually needs close, prolonged contact.
The same piece points back to PAHO’s December 2025 regional alert and gives regional context through epidemiological week 47 of 2025: eight countries reported 229 confirmed HPS cases and 59 deaths in that window, according to PAHO’s wording. It also points readers to WHO for the evolving ship cluster and WHO’s low risk read for the general public.
Why the numbers do not always match
Public health agencies revise counts when laboratory results change, suspected cases are reclassified, or denominators on manifests are reconciled. WHO’s 4 May Disease Outbreak News, WHO’s 7 May briefing figures, and ECDC’s 9 May outbreak page therefore serve different moments in the same investigation. Treat any single number without a date and agency as unreliable.
Timeline on this site
This roundup stays high level. For a chronological summary aligned to WHO and ECDC documents through the site’s research date, open May 2026 outbreak. For prevention steps that still apply outside cruise settings, open How to stay safe.
Research note
Agency pages change after publication. This article was drafted from the sources below on 9 May 2026. Always read the live page for the latest wording, figures, and guidance.