Independent surveillance · Editorially reviewed Data last verified: 21 May 2026 · 09:00 UTC
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● MV Hondius cluster · Day 19 · ECDC revises count to 11; quarantine details emerge
Report date: 20 May 2026 Status: Archived snapshot Risk: ECDC VERY LOW
Dashboard/ Daily Reports/20 May 2026

ECDC 20 May revises total to 11 (9 confirmed + 2 probable); inconclusive case removed from tally

A consolidated 24-hour summary covering events reported between 19 May 06:00 UTC and 20 May 06:00 UTC.

Compiled from primary sources Editor: Hristo Stanchev Sources cited: 3 Events logged: 3
Confirmed / probable (cumulative)
11
-1 (inconclusive entry removed)
Under investigation
0
none active
Deaths (cumulative)
3
±0 in past 24h
Countries involved
12
monitoring continues

What happened on 20 May

ECDC issued its 20 May surveillance update revising the cluster total downward from 12 to 11 cases, comprising 9 confirmed and 2 probable. The previously listed inconclusive entry was removed from the tally, reflecting a methodological standardization with WHO DON601's case definitions. No new cases or deaths since the previous update. ECDC reiterated that additional case identification remains expected throughout the up-to-six-week Andes virus incubation window.

Additional vessel quarantine details emerged: of the 25 crew members originally aboard at Rotterdam arrival, 5 including the captain will remain on board during disinfection. The remaining 20 non-Dutch crew comprising 17 Philippine nationals and 3 Ukrainian nationals entered six-week quarantine in separate cabins at the dedicated port facility. The 2 Dutch medical workers returned home for self-quarantine. The body of the deceased German woman was removed for cremation in the Netherlands. Oceanwide announced the vessel is targeting return to service on 13 June.

24-hour event log (20 May 06:00 → next day 06:00 UTC)

20 May · 09:00
update

ECDC 20 May: total revised to 11 (9 confirmed + 2 probable)

ECDC removes inconclusive entry from cluster tally, harmonizing case definitions with WHO. Total now 11: 9 confirmed + 2 probable. No new cases or deaths. EU/EEA risk remains very low. Additional cases expected during incubation window.

Source: ECDC outbreak surveillance, 20 May 2026
20 May
update

Crew quarantine: 17 Filipino + 3 Ukrainian in 6-week separate-cabin isolation

Vessel quarantine details: 5 crew including captain remain on board during disinfection. 20 non-Dutch crew (17 Philippines + 3 Ukraine) enter 6-week quarantine in separate cabins at dedicated Rotterdam port facility. 2 Dutch medical workers returned home for self-quarantine.

Source: Dutch RIVM / Wikipedia consolidation
20 May
update

Vessel return to service planned for 13 June

Oceanwide Expeditions confirms MV Hondius is targeting return to service on 13 June, with disinfection on track for 21 May completion. Body of deceased German woman removed for cremation in the Netherlands.

Source: Oceanwide Expeditions / Wikipedia consolidation

Sources cited in this report

  1. ECDC outbreak surveillance, 20 May 2026. www.ecdc.europa.eu
  2. MV Hondius hantavirus outbreak, Wikipedia. en.wikipedia.org
  3. Dutch RIVM hantavirus information. www.rivm.nl

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