Hantavirus Global Situational Briefing — May 12, 2026
French passenger who developed symptoms during Tenerife-to-Paris repatriation tests positive for hantavirus — the highest-priority open question from May 11, now confirmed. A Georgia couple are both confirmed positive and transferred to Emory University Hospital's biocontainment unit; combined with a Nebraska case, the confirmed US count reaches at least 3. A Spanish passenger at Gómez Ulla military hospital is preliminary PCR-positive. Working cluster total: approximately 11 confirmed + 2 probable. WHO DON-600 sets the operative 42-day quarantine framework. Radboud University Hospital in Nijmegen places 12 staff in six-week preventive quarantine — the first hospital-acquired exposure cohort of the outbreak. MV Hondius departed Tenerife on May 11 evening, ETA Rotterdam May 17. Multinational genomic analysis confirms a single zoonotic spillover followed by human-to-human transmission; the virus is not a new variant. Traws Pharma announces plans for a hantavirus antiviral clinical candidate.
French passenger confirmed positive. US case count reaches at least 3. Spain preliminary positive. WHO DON-600 42-day quarantine in effect. Radboud University Hospital places 12 staff in 6-week quarantine — first hospital-acquired exposure cohort of the outbreak.
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The French passenger result: yesterday's priority watch item, resolved
The highest-priority open question from the May 11 briefing is confirmed: the French female passenger repatriated from MV Hondius has tested positive for hantavirus. 1
She was one of five French nationals repatriated to Paris on May 10. Symptoms developed during the return flight from Tenerife. By May 11, her condition had deteriorated. French Health Minister Stéphanie Rist confirmed she was in serious condition in a specialized infectious diseases unit in Paris: "Unfortunately, her symptoms worsened overnight." 1 The Spanish health ministry noted she had not presented fever when examined onboard before disembarkation in Tenerife — a detail relevant to the ongoing debate about pre-symptomatic infectiousness and the validity of port screening.
French authorities have traced 22 contact cases among French nationals: 8 who shared the April 25 Saint Helena–Johannesburg flight and 14 from a Johannesburg–Amsterdam flight. 1 French Prime Minister Sébastien Lecornu convened a meeting of medical advisers and ministers Monday afternoon. Government spokesperson Maud Bregeon told BFMTV: "We're following the situation with the greatest vigilance, on the basis that it is a virus that we know, that a 42-day isolation period has been decided and the objective remains the same: protecting the French people." 1 Minister Rist cited a decree published May 11 to "strengthen isolation measures for contact cases and to protect the population," and said what mattered was "to act at the start and break the virus transmission chains." 2
The other four French repatriated passengers tested negative but will be re-tested.
US case count: at least 3 confirmed across Nebraska and Atlanta
Nebraska (UNMC): One American MV Hondius passenger, repatriated via US government medical flight to Offutt Air Force Base early Monday morning, tested "mildly PCR positive" for Andes virus. The passenger is asymptomatic and was placed in the Nebraska Biocontainment Unit at the University of Nebraska Medical Center. 3 UNMC spokesperson Kayla Thomas confirmed: "The passenger who is going to the Biocontainment Unit tested positive for the virus but does not have symptoms." 3 A second passenger on the same flight showed mild symptoms; 15 additional asymptomatic passengers are in the National Quarantine Unit for monitoring. Total US medical facility count: 18 people (17 US citizens + 1 British dual national, ages late 20s to early 80s). A further ~11 people are under monitoring across seven states: Arizona, California, Georgia, Texas, Virginia, New Jersey, and Maryland. 4
Atlanta (Emory): A Georgia couple who had disembarked from MV Hondius in late April and had been under voluntary Georgia DPH home-monitoring both tested positive for hantavirus. One is symptomatic, one asymptomatic. Both were transferred from Hartsfield-Jackson Atlanta International Airport via biocontainment ambulance — the same Ebola-era equipment protocol — to Emory University Hospital's Serious Communicable Diseases Unit. 4 Emory spokesperson Jen Phillips: "One symptomatic individual is receiving care in Emory's biocontainment unit, and one asymptomatic individual — identified as a close contact — is undergoing evaluation and monitoring." 4 Georgia Governor Brian Kemp said he was "very confident" in Emory's expertise: "There is nobody better to handle that than the folks at Emory." 4
The Georgia couple's transfer was described as "contingency planning to preserve UNMC Nebraska biocontainment unit space." 4 This brings the confirmed US case count to a minimum of 3 (Nebraska UNMC + Georgia × 2), potentially 4 if the second UNMC passenger with mild symptoms is confirmed positive.
US HHS officials maintained the public risk assessment at "very, very low." 4 Former public health officials took a sharper view. Dr. Deborah Birx told CNN: "We really do need to stop following viruses by symptoms and follow viruses by tests. It's only through seeing the virus through actual testing, rather than waiting for symptoms, that you can really understand what's going on." 4 Dr. Jerome Adams called waiting for symptoms to appear before testing "a bandaid on a hemorrhage." 4
Spain: preliminary positive at Gómez Ulla
One of 14 Spanish passengers in mandatory quarantine at Gómez Ulla military hospital in Madrid tested positive on a preliminary PCR for hantavirus. The patient is a man, asymptomatic, in good health. 5 The other 13 Spanish passengers tested provisionally negative. All 14 remain in 42-day mandatory quarantine. Final reference-laboratory confirmation was expected "in the coming hours" as of May 11. Spain's Health Ministry stated: "All possible measures had been adopted from the start in order to cut possible chains of transmission." 1
If confirmed, this will constitute Spain's first nationally acquired hantavirus case within the MV Hondius cluster.
Case count: what the numbers say
The official figure depends entirely on which agency is counted and at what time:
- WHO DON-600 (May 8, last published DON): 8 cases — 6 confirmed, 2 probable — 3 deaths 6
- ECDC (May 11, 14:00 CEST): 9 cases — 7 confirmed, 2 probable — 3 deaths 7
- BMJ (May 11): "by 10 May this had risen to 10 cases, said US and Spanish officials" 8
- hantavirustracer.com (May 11): 13 total — 11 confirmed, 2 probable 9
The discrepancy reflects different laboratory confirmation cutoffs and the lag between clinical confirmation and official reporting. The working best estimate — incorporating the French confirmed case, the US Nebraska confirmed case, the Georgia couple (both confirmed), and the Spanish preliminary positive — is approximately 11 confirmed + 2 probable. Death count is stable at 3. ECDC Director Dr. Pamela Rendi-Wagner noted: "Because of remaining uncertainties and the long incubation period, it is possible that we may see additional cases in former passengers and crew in the coming weeks." 10
The estimated reproduction number (R0 ≈ 0.7) means each case infects, on average, fewer than one other person. No community transmission outside the ship-derived cluster has been detected.
Radboud University Hospital: first hospital-acquired exposure cohort
Radboud University Hospital (Radboudumc) in Nijmegen, Netherlands, placed 12 staff members in six-week preventive quarantine following procedural errors during the treatment of a confirmed ANDV-positive patient — identified as MVH-006, a 41-year-old Dutch crew member admitted on May 7. 11
The errors occurred in taking blood samples and disposing of the patient's urine. The hospital's statement: "Due to these circumstances, twelve employees are going into preventive quarantine for six weeks as a precaution, even though the risk of infection is low." 11 All 12 are asymptomatic and under monitoring through the full 42-day ANDV incubation window.
This is the first documented hospital-acquired exposure cohort of the MV Hondius outbreak. The incident is likely to prompt protocol reviews at the other receiving facilities — LUMC Leiden, USZ Zurich, UNMC Omaha, Emory Atlanta, and Düsseldorf University Hospital — and reinforces CDC HAN-528 guidance on airborne infection isolation rooms and N95-or-higher respiratory protection for all clinical interactions with suspected Andes patients. 12
MV Hondius: ship departs Tenerife, bound for Rotterdam
MV Hondius departed Granadilla port, Tenerife, on the evening of May 11, bound for Rotterdam. Expected arrival: Sunday, May 17. 11
Twenty-seven people remain aboard: 25 crew members and 2 medical professionals from the Dutch RIVM (National Institute for Public Health and the Environment). Nationalities: Philippines (17), Netherlands (4, including the 2 RIVM staff), Ukraine (4), Russia (1), Poland (1). 5 The body of the German female passenger who died onboard May 2 remains aboard for repatriation to Germany upon Rotterdam arrival. Disinfection procedures will be conducted at the port.
Total repatriated through Tenerife: 122 people — 35 crew and 87 guests — per Oceanwide Expeditions. Six passengers originally scheduled for Australia (4 Australians, 1 UK resident of Australia, 1 New Zealander) were redirected via Netherlands flights after the planned Australian charter encountered timing problems. 5
Captain Jan Dobrogowski, in a video message to passengers: "The past few weeks have been extremely challenging to us all. What touched me the most, what moved me the most, was your patience, your discipline, and also the kindness that you showed to each other throughout. I could not imagine sailing through these circumstances with a better group of people, guests and crew alike." 1
A Spanish police officer involved in the Tenerife repatriation operation died of cardiac arrest during the operation, per Spanish health minister. 5
Genomics: single spillover, then human-to-human transmission
A multinational team led by Gustavo Palacios (USAMRIID), Bas Oude Munnink (Erasmus MC), Michael Huber (UZH), Samuel Cordey (HUG), Moussa Moise Diagne (Institut Pasteur de Dakar), and Jacqueline Weyer (NICD South Africa) published a preliminary genomic analysis on virological.org on May 10. 13
The key finding: across all sequenced cases, the S and M genome segments are completely identical. The L segment shows only two synonymous single-nucleotide polymorphisms — Case 5 (C2139T) and Case 7 (G576A) relative to reference sequence MN258159. The team's conclusion: "The overall high level of genetic similarity — with a maximum of one detected SNP per individual — strongly suggests that the outbreak most likely originated from a single zoonotic spillover event, or a very limited number of closely related spillover events." 13 Their second conclusion: "Taken together, these findings support a scenario of initial zoonotic introduction followed by subsequent human-to-human transmission during the outbreak." 13
Sequence similarity to 1997 and 2018 Argentine human-source ANDV isolates is 98.71–98.76%, consistent with a Patagonian lineage. No genomic recombination was detected.
ECDC independently confirmed: "Genomic information also shows that the virus involved in the outbreak is similar to Andes viruses already known to circulate in South America, and is not a new variant. There is currently no evidence that this variant spreads more easily or causes more severe disease than other Andes viruses." 10
On May 11, Andrew Rambaut (University of Edinburgh) published interactive phylogenetic trees for all three ANDV genome segments on virological.org, incorporating both the GenBank reference set and the cruise ship-linked sequences. Emma Hodcroft announced that Pathoplexus now supports ANDV sequence deposition — both open (immediate INSDC submission) and restricted-use (up to one year hold) modes. 14
WHO DON-600: case definitions and 42-day quarantine
WHO Disease Outbreak News 600, published May 8, defined the operative categories for clinical and public health management of the outbreak. High-risk contacts are recommended for 42-day active monitoring and home or facility quarantine. Low-risk contacts are recommended for passive self-monitoring. 6
Case definitions, per DON-600: a confirmed case requires PCR or serology confirmation of ANDV infection; a probable case is a symptomatic individual with epidemiological linkage to a confirmed or probable case without available testing; a suspected case is symptomatic with exposure history awaiting testing. 6
WHO continues to assess global risk as low and does not recommend travel or trade restrictions. The PAHO expert Q&A session held May 8 and published May 11 emphasized that the outbreak does not represent the beginning of a new pandemic, and that general-population risk — outside direct ship contacts — remains low. 15 PAHO's preliminary 2026 Americas tally through epidemiological week 15 (April 18): 94 confirmed cases and 13 deaths across the region. 15
Americas endemic background
Argentina: 101 cases, 32 deaths — season's highest since 2018
Argentina's 2025–26 HPS season stands at 101 confirmed cases and 32 deaths (CFR 31.7%) through epidemiological week 16 (BEN SE16, published May 5). 16 Buenos Aires province leads with 42 cases; Salta dominates the northwest at 36 cases (incidence 0.60 per 100,000). A case in Río Colorado (Río Negro province) falls outside the historic endemic zone. A three-case intrafamily Andes virus cluster in Cerro Centinela (Chubut) confirmed person-to-person intradomiciliary transmission with 99.99% genomic similarity across all three sequences. 16
No new epidemiological bulletin data was published in the May 11–12 window; BEN SE17/18 remain inaccessible.
Raúl González Ittig (professor of genetics, UNC / CONICET researcher) documented the mechanism: increased precipitation boosts seed availability, driving Oligoryzomys longicaudatus (the long-tailed colilarga mouse, the primary Andes virus reservoir) population growth. If an infected rodent is present, transmission probability rises — and eventually reaches humans. 16 This is the core dynamic that makes WMO's 61–70% El Niño probability for May–July 2026 epidemiologically consequential.
Chile: CFR 33%, nearly double last year
Chile's MINSAL reports 39 cases and 13 deaths in 2026 year-to-date, a CFR of 33%. 17 For comparison: Chile recorded 44 cases and 8 deaths across all of 2025, a CFR of 18%. The 2026 figure — still only through May 6 — already exceeds the prior year's full-season lethality rate. MINSAL stated: "La mayor letalidad podría relacionarse con factores propios de los pacientes y la oportunidad en el diagnóstico" (higher lethality may relate to patient-specific factors and the timeliness of diagnosis). 18 Cases span 9 of Chile's 16 administrative regions. The national health alert, in effect since January 2026, remains active. No new MINSAL data was released in the May 11–12 window.
Chile's last documented person-to-person Andes transmission was in 2019. Chile's MINSAL also confirmed that the MV Hondius index couple transited Chile in a period that does not correspond to their incubation window, clearing Chile as the probable exposure site. 19
Brazil: 7 cases, 1 death — all domestic, no Andes genotype
Brazil's Ministry of Health confirmed 7 national hantavirus cases and 1 death as of May 11. 20 Geographic distribution: Minas Gerais (2 cases, 1 death), Rio Grande do Sul (2), Paraná (2 — newly confirmed Pérola d'Oeste and Ponta Grossa, May 8), Santa Catarina (1).
The Minas Gerais fatality — Brazil's first hantavirus death of 2026 — was a 46-year-old man from Carmo do Paranaíba (Alto Paranaíba region), confirmed by Fundação Ezequiel Dias laboratory. Occupational exposure to wild rodents in agricultural fields was identified as the exposure route. SES-MG stated the case is isolated, with no link to the ship outbreak. 21
Santa Catarina health authorities (SES-SC) clarified that the state's single 2026 case — a rural woman from Seara who fell ill in February, was hospitalized for 16 days, and recovered — represents a sharp decline from 15 cases in 2025. The SC lineage does not transmit between humans. 22
Brazil's Ministry of Health confirmed that none of the nine hantavirus genotypes circulating in Brazil is the Andes genotype; all are animal-to-human only. Since 1993: 2,412 total cases and 926 deaths nationally. The 2025 annual total of 35 cases was Brazil's lowest on record. 20
Indonesia: Seoul virus cluster — 23 cases, no new reports
Indonesia's Kemenkes (Ministry of Health) confirms 23 Seoul virus HFRS cases from 2024 through epidemiological week 16 of 2026, spread across 9 of 34 provinces. Three deaths have been recorded (CFR 13%); 20 patients recovered. 23 Annual progression: 1 case in 2024, 17 cases in 2025, 5 cases through Week 16 of 2026. No new cases were reported in the May 9–12 window.
All confirmed cases involve Seoul virus (a strain carried by Rattus norvegicus and Rattus rattus), which carries no human-to-human transmission capability. This is epidemiologically entirely separate from the MV Hondius Andes virus cluster. The Salatiga Health Research Center has previously detected hantavirus in rats across 29 Indonesian provinces; 23 human cases against that distribution suggests significant underascertainment remains.
Europe — indigenous hantavirus surveillance
ECDC's Communicable Disease Threats Report (CDTR) for Week 20 (covering May 10–16) has not yet been published as of this briefing; it is expected mid-week, approximately May 13–14. 24 The Week 19 CDTR (May 2–8, published May 8) was the last to cover European Puumala/HFRS surveillance alongside the ship outbreak.
Sweden's Public Health Agency (FHM) updated its international hantavirus tracking on May 11, confirming 9 cases (7 laboratory-confirmed, 2 probable) and 3 deaths. 25 FHM confirmed no Swedish citizens were aboard MV Hondius.
Finland's THL reported on May 8 that two residents of Finland were potentially exposed to hantavirus on the Johannesburg–Amsterdam flight that carried Case 2. Both have returned to Finland without symptoms and have been directed through standard infectious disease protocols. More notably, Finland's Ministry of Social Affairs and Health is preparing legislation to classify Andes virus as a "generally dangerous infectious disease" (yleisvaarallinen tartuntatauti) — a reclassification that would enable mandatory quarantine powers. The rationale is precautionary; Finland has no domestic Andes cases. 26
ECDC maintains that Andes virus has no natural rodent reservoir in Europe and that European hantaviruses (Puumala, Dobrava-Belgrade, Tula, Seoul) carry no human-to-human transmission capability. 7
Research and vaccine pipeline
Moderna + Korea University mRNA vaccine. A collaboration between Moderna and Korea University Medical Center's Vaccine Innovation Center (VIC-K), active since September 2023 under Moderna's mRNA Access program, is developing a broad-spectrum mRNA hantavirus vaccine targeting ANDV. In February 2025, mouse-model experiments confirmed the candidate vaccine prevented ANDV infection. The program remains in preclinical stage; human trials are years away, and no Operation Warp Speed-level government acceleration has been announced. 27 The MV Hondius outbreak did not initiate this program — the collaboration predates it by nearly two and a half years — but the cluster has intensified public attention on the gap.
Traws Pharma clinical candidate. Traws Pharma (NASDAQ: TRAW), a clinical-stage biopharma company in Newtown, Pennsylvania, announced on May 8 plans to advance a hantavirus treatment clinical candidate. The company's existing pipeline focuses on small-molecule antivirals targeting negative-sense RNA viruses (influenza, H5N1, SARS-CoV-2). No specific candidate compound, mechanism of action, or development timeline was disclosed. Hantavirus pulmonary syndrome currently has no approved antiviral treatment; management is supportive in intensive care settings with reported CFRs of 30–50%. 28
Pathoplexus ANDV sequence repository. Emma Hodcroft announced on May 11 that Pathoplexus now supports ANDV sequence deposition, with the current dataset incorporating all INSDC (GenBank/ENA/DDBJ) publicly available sequences and community uploads. Andrew Rambaut's interactive phylogenetic trees for all three ANDV gene segments (S, M, L) are embedded on virological.org. 14 The opening of this repository, combined with the Palacios team's preliminary sequence data, gives the research community the infrastructure to track outbreak genomics in near-real time — something that did not exist for the Epuyén 2018 intrafamily cluster.
Monitoring priorities for May 13, 2026
- Spanish preliminary positive: reference laboratory confirmation pending; will determine whether Spain records its first confirmed national case
- French passenger clinical trajectory: condition worsened overnight May 10–11; next status update from French health authorities
- UNMC second passenger (mild symptoms): confirmation testing results pending
- WHO DON-601: expected given ≥5 new confirmed/preliminary positives since DON-600; not yet published as of this briefing
- ECDC CDTR Week 20: expected May 13–14; will provide first consolidated European surveillance update of the week
- MV Hondius Rotterdam approach: ETA May 17; watch for disinfection protocol update and final crew testing results
- Brazil BEN/epidemiological update: next MoH bulletin expected mid-week; Minas Gerais contested second case classification pending correction
- Argentina BEN SE17/18: inaccessible as of May 12; portal rendering issue; next check cycle
Briefing covers the 24-hour delta window 2026-05-11T00:00Z → 2026-05-12T01:00Z. Previous briefing: May 11, 2026 — Hantavirus Global Situational Briefing. Next scheduled publication: May 13, 2026.
References
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- 9hantavirustracer.com: 2026 MV Hondius Hantavirus Outbreak Live Tracker
hantavirustracer.com
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- 14Virological.org: Experimental embedded trees for ANDV
virological.org
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- 21Agência Brasil / EBC: Minas Gerais confirma primeira morte por hantavírus em 2026
agenciabrasil.ebc.com.br
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- 24ECDC: Weekly Communicable Disease Threats Reports
ecdc.europa.eu
- 25Folkhälsomyndigheten: Hantavirus internationellt, maj 2026
folkhalsomyndigheten.se
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