As of 13 May 2026, the MV Hondius Andes virus outbreak remains the focus of global health surveillance. Here is a consolidated update on where every active thread stands — and what to watch for in the coming days.
The MV Hondius Outbreak: Current Status
Total confirmed cases: 10 Deaths: 3 Countries affected: 8
| Country | Cases | Status |
|---|---|---|
| Netherlands | 2 | 1 stable, 1 ICU |
| France | 2 | Both stable |
| United Kingdom | 1 | Recovered, discharged |
| Germany | 1 | Stable |
| Canada | 1 | Stable |
| Argentina (crew) | 1 | Stable |
| USA | 1 | Monitoring |
| New Zealand | 1 | ICU (Auckland City Hospital) |
The New Zealand case — confirmed 12 May — is the country’s first-ever hantavirus diagnosis. The patient is a MV Hondius passenger who returned to Auckland and developed symptoms approximately 30 days after the cruise. The 30-day incubation is at the long end of the expected range; a Lancet correspondence published last week documented one Hondius case with a 38-day incubation, suggesting the window for new cases has not closed.
WHO Genomic Sequencing Results: What They Actually Mean
WHO released its full genomic analysis of Hondius Andes virus samples on 12 May. The headline: all 10 isolates are highly similar — but investigators cannot definitively rule out a single environmental source.
What this means in plain language:
The virus sequences found in patients from the Netherlands, France, UK, Germany, Canada, Argentina, USA, and New Zealand are genetically nearly identical. This is consistent with two scenarios:
- Single environmental exposure — all passengers were exposed to rodent excreta from the same source (a specific location on the ship, or a shared shore excursion site in Antarctica), and then spread across 8 countries as they returned home
- Person-to-person transmission — an index case or cases infected other passengers through close contact during the voyage
WHO cannot currently distinguish between these two scenarios from the genomic data alone. Epidemiological investigation continues, focused on passenger-to-passenger contact patterns, cabin locations, shared excursion groups, and dining arrangements.
The official WHO position as of 13 May: person-to-person transmission is “possible but unproven.”
ECDC Risk Assessment: What It Means for Europe
The European Centre for Disease Prevention and Control has upgraded its assessment of the MV Hondius cluster to “moderate” risk for the EU/EEA population.
Key ECDC recommendations:
- All EU member states should actively contact-trace returning Hondius passengers who have not yet been identified
- Healthcare facilities should be briefed on HPS presentation and hantavirus testing pathways
- Standard contact and droplet precautions for confirmed or suspected cases
- No restrictions on travel
The “moderate” designation does not mean community spread. It reflects the unusual nature of multi-country Andes virus cases and the uncertainty around transmission mode.
CDC: 45-Day Monitoring Window Extended
The US Centers for Disease Control extended its contact monitoring recommendation from 21 to 45 days on 12 May, following the 38-day incubation documented in one Hondius case.
This means: any US resident who was aboard MV Hondius should monitor for fever, fatigue, and muscle aches until at least 45 days after their last possible exposure on the vessel. For passengers on the final cruise segment, that monitoring window extends into late June.
Anyone developing symptoms should contact their healthcare provider and mention the Hondius exposure immediately — do not wait for symptoms to worsen.
Germany: RKI Reports 3 More Under Enhanced Observation
The Robert Koch Institute confirmed on 12 May that 3 additional German nationals who were aboard MV Hondius are now under enhanced medical observation after developing mild prodromal symptoms. None has been confirmed positive as of this report. Testing is underway.
Germany’s one confirmed case remains in stable condition in Hamburg.
Argentina: Seasonal Outbreak Reaches 106 Cases
Argentina’s endemic hantavirus season — separate from the Hondius cluster — has reached 106 confirmed cases as of 12 May 2026, with 34 deaths. This is above the 5-year average for this point in the year, attributed to elevated rodent populations following La Niña-influenced wet seasons in Patagonia.
The Argentine case in the Hondius cluster was a crew member who had boarded the ship after the southern season — not a case of ship-to-land community spread.
What’s Not Yet Known
Several critical questions remain unanswered as of 13 May:
1. Source of ship contamination: Where on the MV Hondius did rodent activity occur? Was it the cargo hold, galley storage, a specific cabin deck? Investigators have not yet released findings from the vessel inspection.
2. Additional unidentified cases: Not all 700+ passengers have been contacted and tested. WHO estimates the contact-tracing process is approximately 70% complete. Additional cases may still be identified.
3. Person-to-person vs. environmental: This is the central epidemiological question. Answering it requires detailed analysis of contact networks among the 10 confirmed cases — who shared a cabin, a shore excursion group, a dinner table with whom.
4. Long-term outcomes for survivors: Seven of 10 patients are alive; three remain in ICU. Full recovery from Andes virus HPS takes weeks to months. Long-term lung function monitoring is underway at each treating institution.
Key Dates to Watch
| Date | Event |
|---|---|
| Week of May 13–17 | WHO contact-tracing completion expected (70%→100%) |
| Late May 2026 | RKI enhanced-observation results (Germany) |
| Late June 2026 | End of 45-day monitoring window for last Hondius passengers |
| July 2026 | WHO full epidemiological report expected |
How to Stay Updated
We update this site daily when outbreak data changes. Check our live case map → for the current numbers by country, and our news feed → for breaking developments.
Last updated: 13 May 2026. Sources: WHO Disease Outbreak News, ECDC Rapid Risk Assessment, CDC Health Advisory, RKI, Ministry of Health New Zealand.
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