Hantavirus Global Situational Briefing — May 18, 2026

MV Hondius docked at Rotterdam this morning, ending a nine-day transit from Tenerife. Canada confirmed its first Hondius-linked case on May 17 — a Yukon passenger in their 70s, hospitalized in Victoria, BC with mild symptoms. ECDC revised the global count to 12 (9 confirmed, 2 probable, 1 inconclusive), 3 deaths. Spain's patient has largely recovered; France's ECMO patient remains critical. This briefing covers the delta window May 17 00:00 UTC → May 18 08:00 UTC.

MV Hondius docks at Rotterdam; biosafety response begins

MV Hondius reached Calandsteiger 7, Europoort, Port of Rotterdam on the morning of Monday May 18, arriving within its forecast window of 10:00–12:00 CET. 1 The dock had been prepared in advance: 23 prefabricated quarantine cabins erected on the quayside over the preceding days, supplemented by a row of shipping containers converted into isolation rooms. 2

The 27 people aboard — 25 crew members plus 2 RIVM (Netherlands Institute for Public Health and the Environment) medical staff — showed no hantavirus symptoms as of the final shipboard update at 13:40 CET on May 17. 1 Disembarkation will proceed in a staggered sequence coordinated with the decontamination timetable. EWS Group, a Werkendam-based specialist contractor, is responsible for cleaning and disinfection under protocols developed in close consultation with RIVM. 1

Media were invited to observe from a dedicated press boat boarding at Hoek van Holland at 09:00–09:30 CET; no journalists boarded the ship itself. 1 Oceanwide spokesperson Kiki Hirschfeldt told NBC News that once cleaning and consultation with authorities were concluded, the company would "communicate accordingly" — and noted the ship is already accepting bookings for Antarctic expeditions in November and December 2026. 3

The one still-unresolved operational question is the May 29 Northwest Iceland Explorer departure. Oceanwide had told PBS NewsHour on May 13 that it would decide on future sailings by the end of that week — a deadline that passed Sunday May 17 without any public announcement. 1 The voyage remains listed on the company's website with "limited spaces remain."

MV Hondius in polar ice with orange life rafts on davits

Image from: NL Times — Canadian Hondius passenger hospitalized at home with suspected hantavirus

Canada confirms first case; Yukon passenger stable in Victoria

The Public Health Agency of Canada (PHAC) confirmed on May 17 that Canada's National Microbiology Laboratory (NML) in Winnipeg had verified a positive Andes hantavirus result for one MV Hondius passenger. 4 The patient — in their 70s, from Yukon territory — developed mild symptoms (fever and headache) in the days before the presumptive positive was reported on May 16. 5 The patient is hospitalized in Victoria, British Columbia, in stable condition. 5

The patient's traveling companion, also from Yukon, reported very minor symptoms but tested negative at NML. A third Canadian was transferred from secure isolation lodging to hospital "out of an abundance of caution" for assessment and testing. 4 Six Canadians were aboard MV Hondius in total: the confirmed case and their partner isolating on Vancouver Island; one couple from British Columbia; and two individuals self-isolating in Ontario. PHAC is tracking 36 people in Canada with no further confirmed cases. 6

British Columbia Provincial Health Officer Dr. Bonnie Henry framed the confirmation soberly: "Clearly, this is not what we hoped for, but it is what we planned for." 5 She added that hantavirus is "a very different virus than the other respiratory viruses that we've been dealing with — like Covid, like influenza, like measles — and it remains one that we do not consider to have pandemic potential." 5

PHAC shared the confirmed case with WHO under the International Health Regulations. 4 The agency's overall risk assessment is unchanged: "The overall risk to the general population in Canada from the Andes hantavirus outbreak linked to the MV Hondius cruise ship remains low at this time." 4

ECDC count revised to 12; Spain improves, France unchanged

ECDC updated its Andes outbreak tracker on May 17 to 12 cases: 9 confirmed, 2 probable, 1 inconclusive, with 3 deaths and no new fatalities. 7 The agency noted that "the identification of additional cases after former passengers and crew have returned to their home country is expected given the long incubation period of Andes hantavirus." 7 Risk to the EU/EEA general population remains "very low." 7 Genomic sequencing of virus from Hondius passengers matches known South American strains with no evidence of altered transmissibility or a more dangerous variant. 8

The only US passenger who had returned a positive result — Dr. Stephen Kornfeld, a retired oncologist who provided on-board medical care — has now tested negative three consecutive times, reducing confirmed active US-linked ANDV cases to zero. 9 CDC epidemiologist Dr. David Fitter stated: "This is not a novel virus. This is a known virus. We've seen this in the United States before and we know how to respond to it." 8

The French patient — a 65-year-old woman — remains on ECMO (extracorporeal membrane oxygenation) at Hôpital Bichat in Paris in a state described as "grave et stable" (critical but stable), with no clinical change since the May 14 update. 10 All 26 French contact cases tested PCR-negative as of May 14–15; French Health Minister Stéphanie Rist confirmed no further public updates are planned unless a contact tests positive. 10 Separately, Argentina's Instituto Malbrán arrived in Ushuaia on May 18 to begin source-tracing fieldwork at the municipal dump, the first operational investigation into the outbreak's zoonotic origin. 11

In Spain, the 70-year-old male patient at the Unidad de Aislamiento y Tratamiento de Alto Nivel (UATAN) of Hospital Gómez Ulla in Madrid has dramatically improved, with EFE reporting he "mejora y apenas tiene síntomas" (is improving and barely has symptoms) as of May 17. 12 The 13 contacts housed at Gómez Ulla were scheduled for a new PCR test on Monday May 18; if negative, they would be permitted to access common areas and receive visitors under PPE protocols. 13 Two female contacts in Barcelona and Alicante — who shared a Johannesburg-Netherlands flight with the deceased Dutch passenger — received their fourth consecutive negative PCR result on Saturday; if the pattern holds, they may transition to home quarantine by May 23, 28 days after exposure. 13

WHO's last published Disease Outbreak News remains DON-601 (May 13, 11 cases); DON-602 is pending, likely to follow the Rotterdam arrival and Canadian case confirmation. 14 ECDC's Communicable Disease Threats Report for Week 21 (May 16–22) had not been published as of this writing; the CDTR Week 20 published May 13 covered the previous surveillance period. 15

Americas endemic surveillance

Argentina's Boletín Epidemiológico Nacional SE17 holds the 2025–26 season at 102 confirmed hantavirus cases through May 2, 2026, with only one new case in the most recent two-week period (a Buenos Aires Province resident). 16 Genomic work at ANLIS Malbrán has placed the MV Hondius virus cluster at high genetic similarity to strains detected in Neuquén in 2018, though the index case's exposure source remains unconfirmed. 16 The SE18 bulletin is expected around May 19.

Chile's MINSAL epidemiological week 18 data (through May 9) shows 41 confirmed cases and 14 deaths in 2026, a case fatality rate of 34%. 17 That 30-year national tally now stands at 1,461 confirmed cases and 458 deaths (31.4% CFR) since surveillance began in 1996, all caused by Andes virus carried by the long-tailed mouse Oligoryzomys longicaudatus. 18 Two Chilean Hondius passengers remain under home quarantine in Chile; both have tested negative. 17

Brazil's 2026 national count stands at 7 confirmed cases and 1 death, none linked to the cruise cluster (Brazil does not have Andes virus in circulation). 19 The Secretaria de Saúde do Distrito Federal continues to investigate three suspect cases from the Brasília metropolitan area, all with April symptom onset, pending laboratory confirmation. 20

Korea's KDCA (Korea Disease Control and Prevention Agency) website has returned HTTP 400 errors for more than eight consecutive days, and no domestic hemorrhagic fever with renal syndrome (HFRS) case data has been obtained through any accessible alternative source — including Yonhap News and Korea Times — in the current monitoring window. 21

Research pipeline and treatment gap

Traws Pharma (NASDAQ: TRAW) held its Q1 2026 investor call on May 18, with results pre-filed on May 15. 22 The company posted a net loss of $7.1 million (−$0.53 per share) for Q1 against zero revenue, with R&D expenses doubling year-over-year to $4.9 million. 22 A $60 million PIPE financing closed April 15 provides cash runway into Q1 2027. 22 CEO Iain Dukes said the company's pipeline now includes "a potential antiviral therapy for hantavirus," calling the recent outbreak a reminder of a disease with no approved treatments — but no compound name, mechanism, or trial timeline has been disclosed. 22

No transcript or additional SEC filing was available at the time of this briefing's research window.

A May 12 bioRxiv preprint by Tomczak and Weglarz-Tomczak (Nature Innovation Laboratory) identified host endoplasmic reticulum proteases — specifically Signal Peptidase (SP) and Signal Peptide Peptidase (SPP) — as viable drug targets for orthohantaviruses. 23 Through database mining and molecular docking, the authors identified six candidate inhibitors, with "Compound E" achieving the highest binding score against SPP (−0.28). 23 The work remains unreviewed and provides a framework for experimental validation rather than clinical candidates. The Pathoplexus ANDV sequence database now holds 509 sequences, up from 505 as of May 13: Canada contributed two sequences (collected May 15, released May 17 by PHAC's NML), and France contributed two sequences (collected May 10, released May 17 by Institut Pasteur). 24

NOAA's Climate Prediction Center maintains its El Niño Watch at an 82% probability of onset by May–July 2026, rising to 96% through December 2026–February 2027. 25 El Niño conditions correlate historically with elevated rodent population cycles across the Southern Cone, a recognized precursor to higher HPS incidence in Argentina and Chile — relevant as both countries head into their autumn–winter transmission season. The next NOAA ENSO update is June 11.

Watchlist: May 18–22

MV Hondius crew PCR results and decontamination: RIVM arrival testing outcomes for the 27 crew and medical staff; EWS Group decontamination schedule; quarantine placement for the 17 Filipino crew members.
WHO DON-602: Expected following the Rotterdam docking and Canada's confirmed case; would be the fourth Disease Outbreak News on the cluster.
ECDC CDTR Week 21: Typical publication window is Tuesday–Thursday; will reflect the full May 16–22 period including the Hondius arrival.
Oceanwide May 29 decision: Still overdue; the Northwest Iceland Explorer voyage remains open for bookings. A cancellation or confirmation is the key commercial signal for the industry.
France ECMO patient trajectory: No clinical update since May 14; the French Health Ministry has said it will only communicate if a contact tests positive.
Argentina BEN SE18: Expected approximately May 19.
Illinois Winnebago County CDC confirmatory result: Expected approximately May 22.

Briefing covers May 17 00:00 UTC → May 18 08:00 UTC. Previous edition: Hantavirus Global Situational Briefing — May 17, 2026. Next scheduled publication: May 19, 2026.

Cover image: AI-generated.