Why this tier
- Permanent ANDV reservoir in the long-tailed pygmy rice rat across Patagonia (Argentina) and southern Chile (regions VIII-XII).
- Documented person-to-person ANDV transmission in El Bolsón (1996) and recurring household clusters since.
- Argentinian INEI lists the country as the suspected pre-cruise exposure source for the 2026 MV Hondius cluster.
- Active autumn-winter case ramp during the southern hemisphere season most travellers visit.
Precautions
- ·Treat the back-country itinerary like a CDC HPS-prevention page: assume any rodent-frequented enclosed space is a possible exposure.
- ·Carry a P2 / N95-equivalent respirator for opening sheds, refugios, or any unaired hut.
- ·Avoid sleeping on the ground in disused cabins; pitch a tent away from grain stores and woodpiles.
- ·Do not sweep, vacuum, or stir dust in cabins. Wet-clean (10% bleach or commercial disinfectant) and ventilate ≥30 minutes before sleeping.
- ·If exposed to a known rodent infestation, log the date — the 1-6 week incubation window decides what symptoms to act on.
Cabins, refugios & rural shelter
- ·Refugios and seasonal cabins (Bariloche, El Bolsón, Aysén, Magallanes): ventilate, disinfect, sleep on raised bunks if possible.
- ·Estancias and rural homestays: ask whether outbuildings are baited and inspected; sleep in the main occupied house, not the storeroom.
- ·Camping near rivers and grain stores carries higher reservoir density than alpine zones above the rodent line.
Symptom watch — when to seek care
- ·Fever ≥38°C with muscle aches and headache 1-6 weeks after possible exposure.
- ·Rapid progression to shortness of breath, dry cough, dizziness — go to ER the same day; ANDV pulmonary syndrome can deteriorate within hours.
- ·Disclose the trip and any rodent-contact details to the clinician on arrival; this changes the differential.
Vaccine: There is no licensed vaccine for hantavirus (Andes virus or any other species). Prevention is environmental: avoid rodent contact, ventilate enclosed spaces before entry, and do not sweep dust in cabins or sheds.
Why this tier
- Passengers and crew disembarked at Falkland Islands, South Georgia, Saint Helena, Cabo Verde and the Canary Islands during the index voyage.
- ECDC has classified the European public risk as very low, but assigns moderate alertness to the route while contact-tracing continues.
- South America at large carries endemic ANDV (and other New World hantaviruses) in rural rodent populations — risk is exposure-driven, not territory-wide.
- Tertiary-case surveillance in port communities runs 45 days from the last known exposure date.
Precautions
- ·If you visited or worked at a Hondius port of call after April 1, 2026: register with the local public-health unit if asked, and self-monitor for 6 weeks from the last possible exposure.
- ·On expedition cruises generally: avoid handling crew quarters, galley stores, and lower-deck dry stores without staff supervision.
- ·Birdwatchers and field guides — wear gloves and a respirator when entering long-disused huts or shore stations.
- ·Follow standard CDC traveller advice: hand hygiene, food safety, and avoid contact with wildlife including rodents.
Cabins, refugios & rural shelter
- ·Cruise cabins on the MV Hondius and similar expedition vessels: rodent control follows IHR / IMO sanitation rules — there is no passenger action item beyond reporting any sighting to the bridge.
- ·Shore-side guesthouses on Saint Helena, Cabo Verde, Falklands: ventilate before sleeping and avoid storing food open in the room.
Symptom watch — when to seek care
- ·Any fever, body aches, or unexplained shortness of breath within 6 weeks of a port visit.
- ·Tell the clinician about the trip dates and that the 2026 MV Hondius outbreak is on the differential.
- ·If you are a returned passenger or crew member, follow the surveillance plan issued by your home authority before going to walk-in care.
Vaccine: There is no licensed vaccine for hantavirus (Andes virus or any other species). Prevention is environmental: avoid rodent contact, ventilate enclosed spaces before entry, and do not sweep dust in cabins or sheds.
Why this tier
- ECDC and CDC classify general-population risk in receiving countries as very low; cases there are travel-imported.
- ANDV is the only hantavirus with documented person-to-person transmission, and contacts of returning passengers are explicitly traced — household contacts only.
- Local rodent species in most receiving countries are not ANDV reservoirs (deer mice in the western US carry Sin Nombre virus, a separate clinical entity).
- No travel advisory restricts movement to these countries on hantavirus grounds.
Precautions
- ·Standard hand hygiene; no special hantavirus-specific traveller measures required.
- ·Western US travellers (deer-mouse country): avoid sweeping rodent droppings in remote cabins — Sin Nombre virus exists year-round, independent of the Hondius event.
- ·Healthcare workers attending a known Hondius contact: follow national droplet/contact PPE guidance even though aerosol P2P spread of ANDV has not been demonstrated.
Symptom watch — when to seek care
- ·If you live with or care for a returning Hondius passenger and develop fever within 6 weeks, contact your physician and disclose the contact.
- ·Routine flu-like illness in someone with no Hondius link is not a hantavirus alert — proportionate care only.
Vaccine: There is no licensed vaccine for hantavirus (Andes virus or any other species). Prevention is environmental: avoid rodent contact, ventilate enclosed spaces before entry, and do not sweep dust in cabins or sheds.