Hantavirus Updates: What’s Happening, How It Spreads, and What to Know
Last updated: May 7, 2026
Status: Living article — this page will be updated as new verified information becomes available.
Medical note: This article is for public information only and is not medical advice. If you may have been exposed to rodents or have symptoms, contact a medical professional or your local public-health authority.
Latest update
A recent hantavirus cluster has been linked to travel aboard the MV Hondius, a Dutch-flagged expedition cruise ship. The World Health Organization reported a multi-country cluster involving seven cases as of May 4, 2026: two laboratory-confirmed cases and five suspected cases, including three deaths. The investigation involves possible exposure during travel in southern South America and follow-up of passengers and contacts in multiple countries. (World Health Organization)
The strain under investigation is the Andes virus, a type of hantavirus found in parts of South America. Most hantaviruses spread from infected rodents to people, but Andes virus is unusual because rare person-to-person transmission has been documented, usually through close or prolonged contact. Public-health officials are treating the current cluster seriously while continuing to investigate how transmission occurred. (Pan American Health Organization)
This does not currently appear to be a broad public-health emergency for the general public. Hantavirus infections remain relatively uncommon, and the main prevention message is still the same: avoid contact with rodent urine, droppings, saliva, and nesting materials, and clean rodent-contaminated spaces safely. (CDC)
What is hantavirus?
Hantaviruses are a family of viruses carried by certain rodents. People can become infected when they breathe in particles contaminated by urine, droppings, saliva, or nesting material from infected rodents. Infection can lead to serious illness, including Hantavirus Pulmonary Syndrome, a rare but potentially severe disease that affects the lungs. (CDC)
In the Americas, the Pan American Health Organization reported increased hantavirus activity in 2025, especially in parts of the Southern Cone. Through epidemiological week 47 of 2025, eight countries in the Americas reported 229 confirmed cases and 59 deaths, a regional case-fatality rate of 25.7%. (Pan American Health Organization)
How hantavirus spreads
Most hantavirus infections happen through rodent exposure, not casual contact with other people. Higher-risk situations can include:
- Cleaning cabins, sheds, garages, barns, storage rooms, or other enclosed spaces with rodent droppings
- Sweeping or vacuuming dry rodent droppings, which can stir particles into the air
- Camping, hiking, field work, farming, or other activities near rodent habitats
- Handling contaminated nesting material, food storage areas, or traps without proper precautions
The current cruise-linked investigation is notable because Andes virus can rarely spread between people through close contact. That is different from most hantaviruses and is one reason public-health officials are tracing contacts carefully. (World Health Organization)
Symptoms to watch for
Symptoms often begin 1 to 8 weeks after exposure to infected rodents. Early symptoms may include:
- Fever
- Fatigue
- Muscle aches
- Headache
- Dizziness or chills
- Nausea, vomiting, diarrhea, or abdominal pain
Later symptoms can include:
- Coughing
- Shortness of breath
- Difficulty breathing
Anyone who develops flu-like symptoms after possible rodent exposure, especially if breathing symptoms appear, should seek medical care promptly and mention the possible exposure. (CDC)
How to reduce risk
The best prevention is rodent control and safe cleanup. CDC guidance emphasizes avoiding contact with rodent urine, droppings, saliva, and nesting materials. (CDC)
Basic prevention steps:
- Seal holes and gaps where rodents can enter homes, cabins, garages, or sheds.
- Store food, pet food, and trash in sealed containers.
- Avoid stirring up dust in areas with rodent droppings.
- Do not dry sweep or vacuum rodent droppings.
- Ventilate enclosed spaces before cleaning.
- Wet contaminated areas with disinfectant before cleanup.
- Wear gloves when handling contaminated materials.
- Clean traps and dead rodents safely using public-health guidance.
What is still unknown
Several important questions remain under investigation:
- Where the initial exposure occurred
- Whether all cases were infected from the same environmental source
- Whether any person-to-person transmission occurred
- Whether additional cases will appear because the incubation period can be several weeks
- Whether genetic testing shows anything unusual about the virus in this cluster
I will update this page when reliable public-health sources publish new information.
Update log
May 7, 2026 — Created this living hub page. Added WHO details on the MV Hondius cluster, CDC prevention guidance, symptom information, and PAHO/WHO regional context.
Sources being monitored
This page prioritizes information from:
- World Health Organization disease outbreak notices
- U.S. Centers for Disease Control and Prevention
- European Centre for Disease Prevention and Control
Hantavirus is rare, but it can be serious. For most people, the practical takeaway is not panic — it is prevention: avoid rodent exposure, clean contaminated areas safely, and seek medical care quickly if symptoms develop after possible exposure.
