Independent surveillance · Editorially reviewed Data last verified: 21 May 2026 · 09:00 UTC
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● MV Hondius cluster · Day 20 · Status: stable, no new activity
Report date: 21 May 2026 Status: Archived snapshot Risk: ECDC VERY LOW
Dashboard/ Daily Reports/21 May 2026

No new cluster activity reported; disinfection concludes; outbreak enters monitoring-only phase

A consolidated 24-hour summary covering events reported between 20 May 06:00 UTC and 21 May 06:00 UTC.

Compiled from primary sources Editor: Hristo Stanchev Sources cited: 3 Events logged: 3
Confirmed / probable (cumulative)
11
±0 (no new activity)
Under investigation
0
none active
Deaths (cumulative)
3
±0 in past 24h
Countries involved
12
monitoring continues

What happened on 21 May

No new cluster cases or deaths were reported by any IHR Focal Point in the 24-hour reporting window. The cumulative total remains at 11 cases comprising 9 confirmed and 2 probable, with 3 deaths. The MV Hondius disinfection at Rotterdam concluded on schedule, with the vessel transitioning to readiness checks ahead of the planned 13 June return-to-service date. The 18 Americans at Nebraska National Quarantine Unit and the smaller cohorts in Australia, Canada, France, Germany, the Netherlands, Spain, Switzerland, Turkey, and the United Kingdom remain in their respective monitoring or quarantine arrangements without new symptomatic presentations.

The cluster has effectively entered a monitoring-only phase. Significant new case identification depends on the trailing edge of the Andes virus incubation window, which can extend to six weeks from exposure; the last known onboard exposure event was approximately 11 May during the final phase of Tenerife disembarkation. The earliest realistic point at which the cluster can be considered closed is therefore approximately 22 June. Routine ECDC and WHO surveillance updates will continue at reduced cadence.

24-hour event log (21 May 06:00 → next day 06:00 UTC)

21 May
update

No new cluster cases or deaths in past 24h

Cluster total stable at 11 cases (9 confirmed + 2 probable) and 3 deaths. No IHR Focal Point reported new activity in the reporting window. Monitoring continues across 12 affected countries.

Source: ECDC / WHO / national health ministries
21 May
update

Rotterdam disinfection concludes; vessel readiness checks begin

MV Hondius disinfection at Rotterdam port concluded on schedule. Vessel begins readiness checks ahead of planned 13 June return-to-service. Crew quarantine continues in dedicated port facility (17 Filipino + 3 Ukrainian crew in 6-week separate-cabin isolation).

Source: Port of Rotterdam / Oceanwide Expeditions
21 May
update

Cluster enters monitoring-only phase; earliest closure ~22 June

With no new symptomatic presentations and the vessel quarantined, the cluster has effectively entered a monitoring-only phase. Last known onboard exposure approximately 11 May; the up-to-six-week Andes virus incubation window means the cluster cannot be considered closed before approximately 22 June.

Source: Editorial assessment based on ECDC case definitions and incubation window

Sources cited in this report

  1. ECDC outbreak surveillance page. www.ecdc.europa.eu
  2. WHO Disease Outbreak News 601. www.who.int
  3. Port of Rotterdam Authority / Oceanwide Expeditions.

See methodology for the source-tiering framework and corrections log for any future amendments to this report.