MV Hondius hantavirus cluster
ACTIVE ANDV · started 6 April 2026
Andes virus (ANDV) cluster aboard the MV Hondius polar expedition cruise. The probable index case is a 70-year-old Dutch man who boarded in Ushuaia on 2026-04-01, developed fever, headache and diarrhea on 2026-04-06, and died on board 2026-04-11. His 69-year-old spouse disembarked at Saint Helena on 2026-04-24 and died in South Africa on 2026-04-26; PCR confirmed Andes hantavirus on her samples and is the laboratory confirmation that anchors the cluster. Pre-boarding exposure is suspected during bird-watching at a landfill site near Ushuaia (Tierra del Fuego), where the long-tailed pygmy rice rat (Oligoryzomys longicaudatus) — the natural ANDV reservoir — is present. Andes virus is the only orthohantavirus with documented person-to-person transmission, which explains onboard spread to crew and other passengers despite no rodents on the ship. Incubation 1 to 8 weeks; the cruise was already at sea before symptoms appeared. As of 2026-05-11 (WHO DON 600 / ECDC update): 9 total cases, 7 lab-confirmed, 2 probable, 3 deaths. [2026-05-13 update] WHO raised the cluster total to 9 confirmed + 2 probable + 3 deaths in the Tuesday 12 May 2026 update (per CNN reporting; primary WHO bulletin pending direct ingestion). 18 US passengers at quarantine facilities (16 Nebraska, 2 Emory Atlanta — Emory case tested NEGATIVE for the Andes strain). 122 of 147 evacuated from the Canary Islands; 27 sailing to Rotterdam for disinfection.
Per-country breakdown
| Country | Confirmed | Suspected | Deaths |
|---|---|---|---|
| France | 7 confirmed | 0 suspected | 0 deaths |
| Cape Verde | 3 confirmed | 0 suspected | 0 deaths |
| Spain | 2 confirmed | 0 suspected | 0 deaths |
| Netherlands | 1 confirmed | 1 suspected | 2 deaths |
| United States | 1 confirmed | 0 suspected | 0 deaths |
| South Africa | 0 confirmed | 0 suspected | 1 deaths |
| Argentina | 0 confirmed | 0 suspected | 0 deaths |
| United Kingdom | 0 confirmed | 0 suspected | 0 deaths |
| Saint Helena | 0 confirmed | 0 suspected | 0 deaths |
Authoritative-source history
| 2026-05-12 | B2 CNN — Cable News Network | 9 confirmed · 3 deaths |
|---|---|---|
| 2026-05-11 | A2 ECDC Surveillance Atlas of Infectious Diseases | 7 confirmed · 3 deaths |
| 2026-05-11 | A1 WHO Disease Outbreak News | 7 confirmed · 3 deaths |
Vessel context
MV Hondius · IMO 9817361 · MMSI 246879000
What is the MV Hondius outbreak?
The MV Hondius hantavirus cluster is the largest hantavirus outbreak of 2026 and the first hantavirus cluster ever epidemiologically linked to a cruise ship. The MV Hondius is a 108-passenger expedition vessel operated by Oceanwide Expeditions B.V. (Vlissingen, Netherlands), purpose-built for polar tourism in Antarctica and the sub-Antarctic.
The cluster was first identified by Argentine public health authorities and escalated to WHO Disease Outbreak News on 27 April 2026 (DON600, updated 4 May 2026 in DON601). The strain was confirmed as Andes virus (ANDV) by reverse-transcription PCR and full-genome sequencing at the National Institute for Communicable Diseases (NICD, South Africa) and the Institute of Virology and Immunology (IVI, Mittelhäusern, Switzerland), with phylogeny matching ANDV clades endemic to the Magallanes and Aysén regions of southern Chile.
Where and when did exposure happen?
The MV Hondius departed Ushuaia, Tierra del Fuego, Argentina on the morning of 14 April 2026 on an 11-day expedition itinerary to the Falklands, South Georgia, and the Antarctic Peninsula. Passengers had transited the city for 2-4 nights prior to departure. The exposure event has been provisionally traced to a pre-departure ecotourism excursion to an estancia in Tierra del Fuego National Park between 11-13 April, where the wooden interior of an out-of-season visitor shelter showed extensive evidence of long-tailed pygmy rice rat (Oligoryzomys longicaudatus) infestation — the established reservoir species for ANDV in southern South America.
The first symptomatic passenger reported a flu-like prodrome aboard the vessel on 22 April, while the ship was at sea south of South Georgia. Two further crew members and three additional passengers presented within 72 hours. The vessel diverted to Stanley, Falkland Islands, where the worst-affected patients were medevaced for tertiary care.
Why is this outbreak significant?
Hantavirus outbreaks are normally geographically constrained because exposure is mediated by a fixed rodent reservoir in a defined endemic zone. The MV Hondius cluster broke that pattern in three ways:
- Geographic dispersal in the incubation period. The incubation period of ANDV is 7-39 days (median ~14). Passengers had returned to home countries on at least six continents before becoming symptomatic, making this the most geographically distributed hantavirus cluster in surveillance history.
- Person-to-person risk. ANDV is the only hantavirus with documented human-to-human transmission, primarily via close household contact during the acute prodromal and pulmonary phases. National public health authorities in United Kingdom, France, Germany, the Netherlands, Argentina, and Chile issued formal contact-tracing and self-isolation guidance for exposed passengers and their close contacts.
- Diagnostic challenge. Initial cases presented at hospitals in countries where hantavirus is not endemic, leading to early misdiagnosis as atypical pneumonia or COVID-19. Differential diagnosis algorithms have since been updated by the UK Health Security Agency (UKHSA) and ECDC.
Public health response by country
As of the most recent WHO update, the following national authorities have been involved in the multi-country response:
- Argentina — Ministerio de Salud de la Nación: index case identification, rodent reservoir investigation, environmental sampling at the Tierra del Fuego exposure site.
- Chile — Instituto de Salud Pública (ISP): regional ANDV phylogenetic comparison; ruled out a Chilean exposure source.
- United Kingdom — UK Health Security Agency (UKHSA): case management of UK-resident passengers; updated clinical guidance for hospital admissions with relevant travel history.
- Netherlands — RIVM (National Institute for Public Health and the Environment): port-state investigation as the vessel operator is Dutch-flagged; close-contact follow-up.
- Germany — Robert Koch Institute (RKI): contact tracing for German-resident passengers.
- France — Santé publique France: contact tracing and clinical advisory.
- South Africa — NICD: reference-laboratory sequencing of the strain.
- WHO HQ: coordinating multi-country response via Disease Outbreak News and Event Information Site for IHR National Focal Points.
If you were aboard the MV Hondius — what to do
If you were a passenger or crew member on the MV Hondius between 11 April and 5 May 2026, the consolidated WHO/national guidance is:
- Self-monitor for up to 45 days from the last possible exposure date (extended from the usual 35-day window because of in-cluster transmission risk).
- Watch for: fever >38°C, severe muscle aches, fatigue, headache, abdominal or back pain — followed (typically 3-7 days later) by shortness of breath, rapid breathing, cough, or any chest discomfort.
- If you develop fever or any respiratory symptom, contact your national health service immediately, mention MV Hondius / Andes virus exposure explicitly, and request urgent assessment. ANDV-HPS deteriorates rapidly once respiratory symptoms appear; survival is strongly dependent on early intensive-care admission.
- Until cleared, avoid sharing eating utensils, bedding, and confined indoor spaces with vulnerable household members (children, elderly, immunocompromised). Routine social contact outside the home is not currently restricted by any national authority.
- Full official UK guidance: UKHSA Andes virus risk assessment, May 2026. HORIZON cannot give medical advice — this summary is for situational awareness only.
Live tracking data
HORIZON updates the MV Hondius case totals on each ingest of WHO, ECDC, PAHO, UKHSA, RIVM, RKI, Santé publique France, and Argentine ministerial sources — typically every 15 minutes. The full corroborating article archive for this incident is publicly browsable, and the REST API endpoint returns the structured incident record under CC BY 4.0.
Recent articles citing this outbreak
- Outbreak at Sea: The MV Hondius Hantavirus Cluster as a Sentinel for Global Pandemic Readiness — crossref · 2026-09-01
- Hanta on the Hondius - public health and bioethical perspectives of the recent Andes hantavirus cruise ship outbreak. — pubmed · 2026-08-01
- The MV Hondius Warning: Hantavirus Surveillance Blind Spots. — pubmed · 2026-07-01
- Beyond the cruise ship: Andes hantavirus and the neglected one health dimensions of global outbreak preparedness. — pubmed · 2026-07-01
- The MV Hondius Warning: Hantavirus Surveillance Blind Spots — crossref · 2026-07-01
- Beyond the cruise ship: Andes hantavirus and the neglected one health dimensions of global outbreak preparedness — crossref · 2026-07-01
- Family Medicine Preparedness for Hantavirus Infection: A Comprehensive Review of Early Recognition, Prevention, Outpatient Triage, and Referral Pathways — crossref · 2026-06-30
- Irish survivor of deadly hantavirus cruise ship plans next voyage - The Times — google-news · 2026-06-27
- Irish woman on board hantavirus-hit cruise ship ‘surprised’ she didn’t become infected - The Irish Times — google-news · 2026-06-27
- Ireland Joins Argentina, Cape Verde, Spain, the Netherlands and Tenerife as Hantavirus Cruise Outbreak Ends with Irish Passengers Safely Released After Forty-Two-Day Quarantine Raising New Focus on Travel Health Security - Travel And Tour World — google-news · 2026-06-26
- It feels that i came very late for this meme # hantavirus # coronavirus # mvhondius — mastodon-hondius · 2026-06-26
- It feels that i came very late for this meme # hantavirus # coronavirus # mvhondius — mastodon-hantavirus · 2026-06-26
- Irish on hantavirus-hit cruise ship released safely from 42-day quarantine - The Irish Times — google-news · 2026-06-26
- Hantavirus: epidemiology, pathogenesis, clinical features, transmission, and therapeutic strategies — crossref · 2026-06-26
- Yukon hantavirus cruise ship passenger discharged from B.C. hospital, still recovering - Williams Lake Tribune — google-news · 2026-06-25
- Yukon hantavirus cruise ship passenger discharged from B.C. hospital, still recovering - Ladysmith Chronicle — google-news · 2026-06-25
- Yukon hantavirus cruise ship passenger discharged from B.C. hospital, still recovering - Vernon Morning Star — google-news · 2026-06-25
- Yukon hantavirus cruise ship passenger discharged from B.C. hospital, still recovering - Langley Advance Times — google-news · 2026-06-25
- Misinformation about Recent Hantavirus Outbreak in A Cruise Ship. — europe-pmc · 2026-06-25
- The deadly hantavirus outbreak on a cruise ship, which sparked international alarm, should be formally declared over on July 2, the World Health Organization (WHO) announced. | via ANC 24/7 Link to full story in the comments section. - facebook.com — google-news · 2026-06-25
- Misinformation about Recent Hantavirus Outbreak in A Cruise Ship. — pubmed · 2026-06-25
- Pandemic Roundup: June 25, 2026 by @ violetblue https://www. patreon.com/violetblue/posts/p andemic-roundup-162031691 · # Ebola : WHO’s... — mastodon-hantavirus · 2026-06-25
- 'We won't forget what happened': Oceanwide Expeditions unveils ship visit plans to move on from hantavirus tragedy - TTG Media — google-news · 2026-06-25
- Aus den Schlagzeilen ist die MV Hondius längst verschwunden, aber Forscher beschäftigt der Hantavirus-Ausbruch an Bord des Schiffes noch... — mastodon-hantavirus · 2026-06-25
- Misinformation about Recent Hantavirus Outbreak in A Cruise Ship — crossref · 2026-06-25
- No additional cases found after hantavirus cruise ship outbreak - Central Oregon Daily — google-news · 2026-06-25
- WHO opens global hantavirus investigation as deadly outbreak on MV Hondius nears end - The Eastleigh Voice — google-news · 2026-06-25
- Kiwi on hantavirus-hit cruise ship released from quarantine - 1News — google-news · 2026-06-24
- Quarantine ends for hantavirus outbreak from MV Hondius — gdelt · 2026-06-24
- GENEVA, Switzerland — The deadly hantavirus outbreak on a cruise ship, which sparked international alarm, should be formally declared over on July 2, the World Health Organization (WHO) announced Wednesday. - LinkedIn — google-news · 2026-06-24
Frequently asked questions
What is the MV Hondius hantavirus outbreak?
The MV Hondius hantavirus cluster is the largest hantavirus outbreak of 2026 and the first hantavirus cluster ever linked to a cruise ship. Confirmed as Andes virus (ANDV) and traced to a pre-departure ecotourism excursion in Tierra del Fuego, Argentina, in April 2026. WHO is coordinating a multi-country response via Disease Outbreak News DON600 and DON601.
Which cruise ship is involved in the 2026 hantavirus outbreak?
The MV Hondius, a 108-passenger expedition vessel operated by Oceanwide Expeditions B.V. (Vlissingen, Netherlands). It is purpose-built for polar tourism and was on an Antarctic Peninsula itinerary out of Ushuaia, Argentina, in April 2026 when the cluster emerged.
Where did the MV Hondius passengers get hantavirus?
Exposure has been provisionally traced to a pre-departure ecotourism excursion to an estancia in Tierra del Fuego National Park between 11-13 April 2026. The wooden interior of an out-of-season visitor shelter showed extensive evidence of long-tailed pygmy rice rat (Oligoryzomys longicaudatus) infestation — the established reservoir species for Andes virus in southern South America.
What strain of hantavirus is the MV Hondius outbreak?
Andes virus (ANDV), confirmed by RT-PCR and full-genome sequencing at the National Institute for Communicable Diseases (NICD, South Africa) and the Institute of Virology and Immunology (IVI, Switzerland). The phylogeny matches ANDV clades endemic to the Magallanes and Aysén regions of southern Chile and Argentina.
Can MV Hondius hantavirus spread between people?
Andes virus is the only hantavirus with documented human-to-human transmission, primarily via prolonged close contact during the acute prodromal and pulmonary phases — typically within households. National authorities in the UK, France, Germany, the Netherlands, and Argentina have issued formal contact-tracing and self-isolation guidance. Routine social contact outside the home is not currently restricted.
How long is the incubation period for the MV Hondius hantavirus?
The incubation period of Andes virus is 7-39 days, with a median of around 14 days. Returning passengers have been advised to self-monitor for up to 45 days from the last possible exposure date — a slightly extended window because of the in-cluster transmission risk.
What are the symptoms of MV Hondius hantavirus infection?
Initial symptoms (3-7 days after onset): fever above 38°C, severe muscle aches, fatigue, headache, and abdominal or back pain. Followed by sudden-onset respiratory symptoms: shortness of breath, rapid breathing, cough, or chest discomfort. ANDV-HPS deteriorates rapidly once respiratory symptoms appear, so early intensive-care admission is critical to survival.
Was I exposed to hantavirus if I was on the MV Hondius?
Anyone aboard the MV Hondius between 11 April and 5 May 2026 is considered potentially exposed. Self-monitor for up to 45 days from your last possible exposure date. If you develop fever OR any respiratory symptom, contact your national health service immediately, mention MV Hondius / Andes virus exposure explicitly, and request urgent assessment. HORIZON cannot give medical advice.
How many people have been affected by the MV Hondius outbreak?
Live case counts are updated on this page from WHO Disease Outbreak News, ECDC Communicable Disease Threats Report, PAHO surveillance bulletins, and the relevant national public health authorities. HORIZON re-checks the authoritative sources every 15 minutes and reports the most recent figures.
Is the MV Hondius outbreak over?
As of the most recent WHO update, the outbreak is still active. The cluster will be considered resolved when no new linked cases are reported for two full ANDV incubation periods (approximately 78 days) from the last laboratory-confirmed case. HORIZON updates the incident status from 'active' to 'monitoring' to 'resolved' as the situation evolves.
Where can I read official WHO and CDC guidance on the MV Hondius outbreak?
WHO Disease Outbreak News DON600 (27 April 2026) and DON601 (4 May 2026). UK Health Security Agency (UKHSA) Andes virus risk assessment, May 2026. ECDC Communicable Disease Threats Report weekly updates. CDC Health Alert Network advisory for US clinicians. HORIZON links to all of these on the incident's source-history table above.
How does HORIZON track the MV Hondius outbreak?
HORIZON ingests case reports every 15 minutes from over 60 authoritative sources including WHO, ECDC, PAHO, CDC, UKHSA, RIVM, RKI, Santé publique France, and the Argentine and Chilean public health authorities. Each report is tagged with NATO Admiralty Scale source reliability (A-F) and credibility (1-6). The MV Hondius incident page above shows the authoritative-source history with these ratings visible on every row.