Same virus family, two different medical dramas
In the Americas, the headline syndrome is HPS, where damaged lung vessels leak fluid into air spaces. Across much of Europe and Asia, related viruses more often drive HFRS, where kidneys, blood pressure, and bleeding risk move to center stage. Seoul virus is the reminder that HFRS-type illness is not locked to one continent; CDC notes it occurs worldwide, including in the United States.
If you are still weighing exposure risk, read the prevention guide next so the symptom timeline below has context.
HPS: the week-long disguise, then the sprint
CDC’s public overview states that HPS symptoms usually begin one to eight weeks after contact with an infected rodent. That long runway is why people shrug off the first wave; it feels like a bad flu or a tough workout until it is not.
WHO’s general fact sheet lines up with that timetable, noting symptoms often start between one and eight weeks after exposure depending on the virus, and that early illness frequently stacks fever, headache, muscle aches, and gastrointestinal upset before the regional syndrome shows its full hand.
Early phase symptoms CDC lists include fatigue, fever, and muscle aches that favor large groups such as the thighs, hips, back, and sometimes shoulders.
Roughly half of patients also report headaches, dizziness, chills, and abdominal trouble such as nausea, vomiting, diarrhea, or abdominal pain.
When breathing becomes the emergency
Four to ten days after that first phase, CDC describes a second wave: cough, shortness of breath, and chest tightness as the lungs fill with fluid. That transition is the signal to treat breathing changes as an emergency, not as something to sleep off.
CDC’s same public summary cautions that about 38% of people who develop those respiratory symptoms may die from the disease. The blunt statistic exists to underscore speed of decline, not to predict any individual outcome.
HFRS: kidneys, pressure, and bleeding risk
CDC states HFRS symptoms usually appear within one to two weeks of exposure, though in rare cases the wait can stretch toward eight weeks. The illness often announces itself suddenly.
- Intense headaches, back and abdominal pain, fever or chills, nausea, and blurred vision during the opening phase.
- Possible flushed face, red or inflamed eyes, or rash, per CDC’s public description.
- Later features can include low blood pressure, shock from poor perfusion, internal bleeding from leaky vessels, and acute kidney failure with dangerous fluid overload.
Severity tracks the virus. CDC contrasts infections such as Hantaan or Dobrava, where a published range of roughly 5 to 15% of cases may be fatal, with Seoul, Saaremaa, or Puumala infections that are usually milder, with under 1% mortality in CDC’s summary. Full recovery can still take weeks to months.
Why clinicians ask about rodents, not just symptoms
CDC notes that within the first 72 hours of symptoms, laboratory confirmation can be elusive, so repeat testing after symptom day three is common if suspicion stays high. Early fever, headache, muscle aches, nausea, and fatigue overlap heavily with influenza, which is exactly why mentioning rodent exposure, travel, or unusual cleaning tasks can change the triage path.
Transmission detail that changes household advice
CDC’s key-points list still singles out Andes virus as the hantavirus type with documented person-to-person spread, usually among people in very close contact with a sick patient. That fact does not erase rodent precautions; it adds a layer for caregivers during South American outbreaks.
Treatment reality checks expectations
CDC states plainly that there is no specific antiviral cure; care is supportive, ranging from hydration and symptom control to intensive breathing support for HPS or dialysis when HFRS crushes kidney function. WHO’s fact sheet echoes the absence of a licensed vaccine or targeted antiviral for these infections, which keeps prevention and early recognition central.
If you think this illness could apply to you or someone you are caring for, seek a clinician immediately, say where rodent contact may have happened, and rely on the CDC and WHO pages linked in Sources for the exact wording agencies want clinicians to use.