Symptom triage.
Hantavirus is on no clinician's first-line differential. If you have flu-like symptoms after possible rodent exposure or recent travel to an endemic region — or you were on the MV Hondius — tell your clinician explicitly so they can consider hantavirus.
Red flags — go to the emergency department now
If you have any one of these symptoms and possible hantavirus exposure, go now. Don't wait. Survival in HPS depends on getting to a tertiary ICU before respiratory failure.
- !Shortness of breath or feeling like you can't get enough air
- !Chest tightness or rapid heart rate at rest
- !Persistent vomiting + can't keep fluids down
- !Decreased urine output, dark urine, or sudden severe flank pain
- !Confusion, disorientation, or altered mental state
- !Coughing up blood or pink frothy sputum
- !Bleeding from the gums or unexplained bruising (HFRS form)
Watch list — contact your clinician same-day
- ·Fever above 38.5 °C (101.3 °F)
- ·Deep muscle aches especially in thighs, hips, and lower back
- ·Severe headache, fatigue
- ·Nausea, vomiting, abdominal pain (GI prodrome)
- ·Recent contact with rodent excreta or rural travel in an endemic region
What to tell the clinician
- Possible hantavirus exposure — be explicit; it's not on a routine differential.
- Exposure history: rodent contact, rural travel, MV Hondius / cruise contact, dates.
- Symptom onset date and progression.
- Ask them to consider hantavirus PCR/serology — routine respiratory panels do not include hantavirus.
FAQ
When should I go to the ER right now?
If you have any of: shortness of breath, chest tightness, rapid heart rate, persistent vomiting, decreased urine output, severe abdominal pain, or you feel like you can't get enough air — go now. Tell the ER team about possible hantavirus exposure (rodents, rural travel, recent MV Hondius contact) explicitly so they can include hantavirus in the differential.
What if I have flu-like symptoms but no respiratory distress yet?
Contact your primary care clinician same-day, especially if you had recent rodent exposure or rural travel. Hantavirus prodrome (fever, deep muscle aches, headache, GI symptoms) can look like influenza for 3–5 days before the cardiopulmonary phase. Early ICU referral dramatically improves survival.
Should I get tested if I was on the MV Hondius?
Yes — contact your national public health authority for follow-up surveillance. They will guide testing based on your symptoms and the time since potential exposure. Routine respiratory PCR panels do NOT include hantavirus; testing must be requested specifically.
Related
- Hantavirus symptoms by stage
- Treatment and prognosis
- MV Hondius outbreak — live
- Prevention and safe cleanup