MV Hondius Hantavirus Outbreak: Live Timeline — 14 Cases, 14 Countries (May 2026)

This is a single page record of the MV Hondius hantavirus outbreak. We update it as official sources publish new information; the most recent material appears at the top. For live counts, country breakdowns and a map, use the homepage tracker. For the strain biology behind this event, see Andes virus, the strain at the center of MV Hondius.

The route

MV Hondius is an expedition-class cruise ship operated for the Antarctic and South Atlantic itinerary market. The relevant voyage departed Ushuaia, Argentina on March 20, 2026 with a planned route through the South Atlantic, calling at the Falkland Islands, South Georgia, Tristan da Cunha, Saint Helena, Cabo Verde, and ending at the Canary Islands. Symptom onset among passengers ranged from April 6 to April 28, 2026.

Timeline

March 20, 2026 — Departure, Ushuaia

The ship leaves the Argentine port. Passenger manifest, later published in part by Argentine and Dutch authorities, includes travelers from at least eighteen nationalities.

April 6–28, 2026 — Onset window

Multiple passengers develop fever and gastrointestinal symptoms with rapid progression to pneumonia and acute respiratory distress syndrome. The ship's medical officers manage early cases as suspected viral pneumonia.

April 27, 2026 — First fatality

A passenger dies aboard during a transit between Saint Helena and Cabo Verde. Local maritime medical services consult and the case is provisionally classified as severe community-acquired pneumonia. Body repatriation later supports laboratory diagnosis.

May 4, 2026 — WHO Disease Outbreak News notice

The World Health Organization issues DON-599, describing seven cases of hantavirus infection (two laboratory-confirmed, five suspected) and three deaths among passengers and crew. The notification places risk at country level as low and global level as low.

May 6, 2026 — Strain confirmed

Reference laboratory work, coordinated through Argentina's INEI and the Robert Koch Institute, identifies the causative agent as the Andes virus (ANDV). This raises the analytical concern that limited person-to-person transmission could have occurred on board, given ANDV's historically documented ability to do so.

May 7, 2026 — First confirmed European case

Swiss federal public-health authorities announce the first confirmed case in Europe — a returned passenger admitted to a Zürich teaching hospital. Related case finding extends to the Netherlands, Belgium, Spain, Germany, and the United Kingdom.

May 7, 2026 — International contact tracing begins

Africa CDC, ECDC, and US CDC each issue technical advisories for passenger and crew contact tracing. By the end of the day at least twelve countries report active investigation.

May 8, 2026 — Eighth case and dataset publication

ECDC publishes a technical assessment confirming five laboratory-confirmed and three probable cases. HantaCount publishes a machine-readable dataset of confirmed and suspected cases for press and academic re-use.

Geographic distribution

Confirmed and probable cases as of this update span Switzerland, the Netherlands, Belgium, Spain, Argentina, the United States, Singapore, and the United Kingdom. Surveillance is active in Cabo Verde, Saint Helena, the Falkland Islands, and several other ports of call. The country-level breakdown on the homepage map is updated as cases are confirmed.

Public-health response

• Active surveillance of disembarked passengers and crew for 45 days from last day of exposure.
• Reference laboratory testing with serology and RT-PCR, with sequencing for outbreak investigation.
• Travel guidance: WHO does not currently recommend any travel restrictions related to this event.
• Hospital readiness: ICU capacity reviews underway in major receiving cities including Zürich, Amsterdam, and Madrid.

What we are watching next

1. A clearly documented tertiary case — somebody infected by a passenger but with no link to the ship — would materially change the risk assessment.
2. A healthcare-worker case, especially without obvious breach of personal protective equipment.
3. The genomic comparison between MV Hondius isolates and historical Argentine ANDV sequences. If the cluster strain has diverged in any biologically interesting way, sequencing will see it before clinicians do.

Where is the ship now? Live AIS position

The MV Hondius reports its position over the public AIS network. The embed below shows the latest broadcast captured by VesselFinder; if the ship is in port or has switched its transponder off, the marker falls back to the last known position. AIS data is third-party, unaffiliated with HantaCount and may be delayed by minutes.

For the underlying voyage record, including arrivals at the Falkland Islands, Saint Helena and Cabo Verde, see the full vessel page on VesselFinder.

Sources used in this dossier

• WHO DON-599 (May 4, 2026) and subsequent updates
• ECDC technical assessment (May 6, 2026)
• Africa CDC statement (May 7, 2026)
• National public-health communications: Switzerland (BAG/FOPH), Netherlands (RIVM), Spain (CCAES), United States (CDC), Argentina (Ministerio de Salud)
• Wells RM et al. (1997) Andes virus and the El Bolsón cluster, Emerging Infectious Diseases

This timeline is updated as new official information becomes available. The current case totals and country list are mirrored on the homepage tracker.