Hantavirus Tracker

An Andes hantavirus cluster tied to the Dutch‑flagged MV Hondius has triggered international contact tracing after passengers dispersed globally; public reports attribute the outbreak to the Andes virus and, as of late May, counts vary between reports (one citing 13 confirmed cases and three deaths, another citing three deaths and five additional infections), and authorities—including South Africa’s NICD—have confirmed cases while cautioning that current evidence does not support a new global pandemic.

Manitoba health officials stress local risk remains low: the province carries Sin Nombre (no cases since 2016), which is ecologically distinct from Andes (the latter can rarely spread person‑to‑person), so responses should prioritize international tracing and source investigation for the cruise cluster while keeping provincial messaging focused on rodent control and targeted surveillance.

Tracking: hantavirus

Geography: Global, United States (Four Corners region, New Mexico, Colorado, Arizona, Utah), Canada, Mexico, Argentina, Chile, Bolivia, Paraguay, Brazil, Uruguay, Finland, Sweden, Norway, Germany, China, South Korea, Russia, Japan, rural/remote areas (farming, cabins, field sites)

1. Deadly Andes virus outbreak on cruise ship reported; 13 cases, three deaths

The CDC is responding to a deadly hantavirus outbreak aboard a cruise ship in the Atlantic Ocean first reported May 2, 2026.

Public reporting links the cluster to Andes virus, which can cause hantavirus pulmonary syndrome (HPS), a severe and potentially deadly lung disease. As of late May the cruise-associated cluster had produced 13 confirmed cases and three deaths.

The vessel named in news coverage is the MV Hondius, a Dutch-flagged cruise ship that carried passengers and crew from 23 countries, prompting international attention.

Manitoba Health, Seniors and Long-Term Care clarified that the hantavirus circulating in the province is Sin Nombre, a distinct strain from the Andes virus tied to the cruise ship cluster.

Manitoba officials emphasized the difference to prevent misattribution of the local Sin Nombre cases to the cruise outbreak.

Key facts:

- CDC responding to Andes virus outbreak on cruise ship, reported May 2, 2026

- Outbreak strain identified as Andes virus, which can cause hantavirus pulmonary syndrome

- HPS described as a severe, potentially deadly lung disease

- As of late May, cruise-associated cluster produced 13 confirmed cases

- As of late May, cruise-associated cluster produced three deaths

Why it matters: A cruise-linked Andes virus cluster with international passengers and multiple deaths elevates cross-border public health coordination needs and public communication urgency.

Manitoba’s clear distinction between local Sin Nombre circulation and the cruise-associated Andes strain highlights the risk of public confusion and underscores the importance of precise strain identification in surveillance reports.

Watch for CDC and local health updates on case counts, laboratory confirmations, and guidance to passengers, crews, and jurisdictions that received disembarked travelers.

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2. Andes hantavirus cluster on MV Hondius kills three, infects five

A cluster of Andes hantavirus infections tied to the MV Hondius cruise ship has caused three deaths and five additional infections, prompting international contact tracing.

A passenger was medically evacuated to South Africa in late April; testing at the National Institute for Communicable Diseases confirmed hantavirus after negative tests for Covid-19, influenza and Legionnaires' disease.

Passengers dispersed globally after disembarkation in St. Helena, complicating containment efforts.

Jacqueline Weyer of South Africa’s NICD said she repeated analyses to confirm the diagnosis, and public-health teams are prioritizing tracing and source investigation; a medical expert said current evidence does not support fears of a new global pandemic.

Key facts:

- MV Hondius cruise linked to hantavirus cluster

- Three deaths and five other infections reported to date

- Patient medically evacuated to South Africa in late April

- Jacqueline Weyer confirmed hantavirus via repeated testing

- Passengers disembarked in St. Helena nearly two weeks later

Why it matters: Rapid, international contact tracing and laboratory confirmation will determine whether cases remain limited or seed additional infections; dispersed passengers increase monitoring burdens for national public-health agencies.

If investigations identify onboard rodent exposure or evidence of onward transmission, port-health measures, cruise operations, and cross-border surveillance priorities will likely change, while diagnostic and genomic sequencing capacity will become central to response planning.

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3. Manitoba says local hantavirus risk remains low; no cases since 2016

Manitoba Health, Seniors and Long-Term Care says the province's hantavirus risk remains low and that the locally present strain is Sin Nombre, with no reported Manitoba cases since 2016.

Sin Nombre transmits primarily via inhalation of airborne particles when dried rodent droppings, urine, or saliva are disturbed and is not known to spread person-to-person; the recent Dutch-flagged cruise ship outbreak involved the Andes virus, which is found in Argentina and Chile and can rarely spread between people, but Manitoba rodents do not carry Andes and no related cases or contacts have been identified in the province.

Officials advise preventing rodent infestations and following provincial guidance on rodent-proofing and safe cleanup (gov.mb. ca/health/publichealth/diseases/hantavirus.

html).

The clear distinction between local Sin Nombre ecology and the cruise-ship Andes exposure should shape public messaging, keeping response focused on environmental control and targeted surveillance rather than concerns about sustained human transmission in Manitoba.

Key facts:

- No reported Sin Nombre virus cases in Manitoba since 2016

- Manitoba's present hantavirus strain is Sin Nombre

- Sin Nombre spreads via inhalation of airborne particles from disturbed rodent droppings, urine, or saliva

- Sin Nombre is not known to spread person-to-person

- Andes virus linked to the Dutch-flagged cruise ship outbreak in early May

Why it matters: The advisory narrows local concern by differentiating a low-risk, rodent-associated Sin Nombre ecology from the cruise-ship Andes exposure that involved rare person-to-person transmission.

That distinction allows public health efforts to prioritize rodent control, safe-cleanup outreach, and focused surveillance rather than broad measures for human-to-human transmission; watch for any future identification of Andes-linked cases or contacts in the province.

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