Clinical
Hantavirus pulmonary syndrome (HPS) typically begins with a flu-like prodrome one to eight weeks after rodent exposure, then can escalate rapidly to respiratory failure. The window between 'I feel off' and 'this is an emergency' can be short.
Key facts
Symptoms most often appear one to eight weeks after exposure, with many cases clustering around the second to third week. Onset is not always remembered relative to a single exposure event — cabin cleanup, sweeping a shed, or sleeping in a closed-up rural structure are common triggers, and the patient may not connect them at first.
The first phase looks like a non-specific viral illness. The clue is the rodent-exposure history, not the symptom list itself.
After roughly four to ten days of early symptoms, HPS can progress to the cardiopulmonary phase. This phase is a medical emergency.
Any respiratory symptom that appears within eight weeks of known rodent exposure — especially in a rural Western U.S. setting or after cabin, shed, or cleanup activity — should be evaluated by a clinician immediately. Mention the exposure history out loud; that history is what unlocks the right testing.
There is no symptom checklist on this site that can diagnose hantavirus disease. Symptoms here are context for clinicians and exposed individuals — the diagnostic decision lives with a clinician and a public-health laboratory.
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