Hantavirus Map Live, Global Outbreak Tracker

Generally, no. Most hantavirus species — including Sin Nombre virus, Puumala, Hantaan, and Seoul — are transmitted only through contact with infected rodents or their droppings, urine, and saliva. The single documented exception is the Andes virus (ANDV), found primarily in Argentina and Chile. Andes virus has been linked to limited person-to-person transmission, but only in cases of close, prolonged contact (e.g., household members or healthcare workers without protection). The MV Hondius cluster involves Andes virus, which is why contact tracing is being conducted internationally despite the rarity of human-to-human spread.

Hantavirus incubation typically ranges from 1 to 8 weeks after exposure, with most cases presenting symptoms 2-4 weeks after contact (CDC). This long incubation is one reason WHO continues active monitoring of MV Hondius passengers and contacts: passengers who disembarked at Saint Helena on 24 April 2026 returned home to multiple countries, so new cases linked to the cluster could emerge as late as mid-June 2026. The live country list and contact tracing scope are shown on the homepage.

Mortality varies sharply by virus species. Andes virus and Sin Nombre virus, which cause hantavirus pulmonary syndrome (HPS), have a historical case fatality rate (CFR) of 30-40%. The Eurasian variants causing hemorrhagic fever with renal syndrome (HFRS) — Puumala, Hantaan, Seoul — have lower CFR: Puumala 0.1-1%, Seoul ~1-2%, Hantaan 5-15%. The MV Hondius cluster involves Andes virus, the most lethal strain. The current CFR for this cluster is shown on the homepage Deaths KPI (deaths divided by confirmed cases) and updates hourly as new data is reported. There is no specific antiviral treatment; supportive intensive care (oxygen, ventilation, ECMO) is the standard of care and improves outcomes when initiated early.

The MV Hondius cluster is the active hantavirus outbreak as of 2026. Live counts (confirmed cases, suspected cases, deaths, affected countries, and people under contact tracing) are shown on the homepage KPI bar and refresh hourly from D1. Patients are hospitalized in the Netherlands, Germany, Switzerland, South Africa, and Saint Helena; contact tracing remains active in the United States, Singapore, Canada, France, the United Kingdom, and Spain. WHO, CDC, ECDC, PAHO, and Africa CDC have each issued situational updates. Prediction markets on Polymarket are tracking the probability of WHO declaring a pandemic in 2026 and additional country-specific case confirmations — see the Markets section for live odds. All numbers update hourly from 50+ sources; this FAQ deliberately avoids hardcoded figures so it never goes stale.

The two viruses differ on nearly every dimension that matters epidemiologically. Transmission: COVID-19 (SARS-CoV-2) spreads efficiently via airborne respiratory droplets and aerosols between humans; hantavirus is primarily zoonotic (rodent-to-human), with Andes virus the only species showing rare limited human-to-human spread in close prolonged contact. R0 (basic reproduction number): COVID-19 original 2-3, current variants up to 8-15; Andes virus R0 in human-to-human transmission <1, meaning sustained outbreaks are unlikely. Mortality: COVID-19 case fatality rate 0.5-2% population-wide; Andes hantavirus 30-40%. Pandemic potential: COVID-19 caused millions of deaths globally; hantavirus has never caused a pandemic and WHO assesses current risk as low. The current MV Hondius cluster illustrates a contained zoonotic event traced to a single source, not the start of a pandemic — current Polymarket pandemic odds are tracked live on this site.