Hantavirus Tracker

A multinational Andes virus cluster tied to the cruise ship MV Hondius — 11 confirmed passenger infections with three reported deaths (nine typed as Andes; one Canadian with a presumptive positive) — exposes cross-border transmission risks and immediate gaps in laboratory confirmation and healthcare biosafety.

PAHO/WHO alerts (Argentina 134 cases, Chile 62 in 2024) and CDC's U. S.

baseline (883 cumulative HPS cases since 1993) underline a high case-fatality burden (PAHO/WHO 30–40%; CDC ~36%) and no specific treatment; watch for final confirmatory test results, outcomes of contact monitoring and quarantines, and whether surveillance, diagnostic capacity, and cleaning/biocontainment measures are rapidly strengthened.

Tracking: hantavirus

Geography: United States (notably Four Corners / rural western states), Canada, Mexico, Argentina, Chile, Bolivia, Peru, Brazil, Paraguay, China, South Korea, Russia, Northern and Eastern Europe (areas with HFRS cases), rural and peri-urban settings where rodent reservoirs are present

1. Andes hantavirus linked to MV Hondius: 11 cases, three deaths reported

A hantavirus outbreak tied to the cruise ship MV Hondius has produced 11 confirmed infections among passengers and three passenger deaths; nine of the 11 cases have been identified as Andes virus and a Canadian passenger has a presumptive positive test and is hospitalized and isolated.

National laboratories are running confirmatory testing — Canada sent samples to its National Microbiology Laboratory in Winnipeg — while WHO and national authorities evacuated, quarantined, and are monitoring contacts across multiple countries.

Sources disagree on death confirmations: some reports state two deaths were laboratory-confirmed, while WHO reports three deaths among passengers.

Public-health measures include isolation of at least 36 people in Canada, investigation of six potential Washington state cases linked to a shared flight, and quarantine of 12 Dutch hospital staff after mishandling patient fluids.

The Hondius sailed back to the Netherlands for cleaning and disinfection, and WHO has advised up to 42 days' isolation given the virus' incubation and severity.

The event underscores cross-border exposure, diagnostic confirmation needs, and healthcare biosafety gaps.

Key facts:

- 11 confirmed hantavirus infections among MV Hondius passengers

- Three passengers have died during the MV Hondius outbreak

- Nine of the 11 cases identified as Andes virus (WHO report)

- Canadian passenger tested presumptive positive and is hospitalized

- Canada sent samples to its National Microbiology Laboratory in Winnipeg

Why it matters: Andes virus can transmit person-to-person in rare cases and has a long incubation, so delayed secondary cases remain plausible, expanding contact-tracing and laboratory-confirmation workloads.

Cross-border travel and reported hospital biosafety lapses increase exposure networks and operational burdens for public-health, clinical, and laboratory teams, requiring reinforced infection-control, sustained isolation policies, and prioritized confirmatory testing.

NbcnewsHantavirusreportsBBC

2. PAHO, WHO alert after hantavirus cluster linked to cruise ship

PAHO and WHO issued alerts after rising hantavirus activity across the Americas and a multinational cluster tied to cruise ship travel.

PAHO reported Argentina had 134 confirmed HPS cases in 2024 and Chile 62; Andes virus is the primary South American agent and can transmit person-to-person.

The WHO account describes a cluster linked to vessels visiting Argentina and Chile: 11 confirmed cases including three deaths, nine confirmed as Andes virus, and about 147 passengers and crew from more than 20 countries under monitoring as evacuees return to Tenerife.

Both agencies recommend strengthening surveillance, laboratory diagnostic capacity, risk communication, and targeted travel or cleaning precautions for operators and visitors to endemic areas.

HPS is primarily transmitted via inhalation of aerosolized rodent excreta, typically increases in late spring–summer, and carries an estimated case fatality rate of 30–40%, underscoring urgency for early recognition and coordinated response.

Key facts:

- PAHO: Argentina reported 134 confirmed HPS cases in 2024.

- PAHO: Chile documented 62 HPS cases in 2024.

- Andes virus is primary South American hantavirus and can transmit person-to-person.

- MV Hondius cluster: 11 confirmed cases, including three deaths.

- WHO confirmed nine MV Hondius cases are Andes virus strain.

Why it matters: This cluster connects endemic Southern Cone transmission with international travel, creating a "global health coordination challenge" and increasing demands on national public health laboratories, surveillance, and contact tracing.

Clinicians, port authorities, and cruise operators should prioritize rapid diagnosis, monitoring, and risk communication given the 30–40% case fatality rate and Andes virus's person-to-person potential; watch for additional case confirmations, any secondary transmissions, and regional surveillance updates.

Hantavirusreports

3. CDC Reports 883 Cumulative HPS Cases in United States Since 1993

The Centers for Disease Control and Prevention updated hantavirus pulmonary syndrome (HPS) surveillance, reporting 883 cumulative cases across 36 states since the first recognized Four Corners cases in 1993.

The Sin Nombre virus remains the primary cause of HPS in North America, with most infections occurring in rural areas of the western United States; New Mexico, Colorado, Arizona, and California report the highest numbers.

The reported case fatality rate is approximately 36 percent, and there is no specific treatment or vaccine for hantavirus infection, making prevention the most critical intervention.

Early recognition of symptoms and prompt supportive care in intensive care settings can improve outcomes, and the CDC recommends sealing holes to prevent rodent entry, using traps to reduce populations, and safely cleaning rodent droppings with proper respiratory protection.

Key facts:

- 883 cumulative HPS cases in the United States since 1993

- Cases reported across 36 U.S. states

- First recognized outbreak in the Four Corners region in 1993

- Sin Nombre virus is the primary North American HPS cause

- Most cases occur in rural western U.S. communities

Why it matters: A sustained cumulative caseload with a high (~36%) fatality rate underscores persistent risk in rural western states and ongoing public-health burden.

Public health departments, clinicians, and One Health partners must prioritize rodent-control, targeted risk communication, and clinician awareness to reduce exposures and speed diagnosis.

Because no specific antiviral or vaccine exists, investments in prevention, community outreach, and clinical readiness (early recognition and intensive supportive care) offer the clearest pathways to lower mortality and limit future cases.

Hantavirusreports