Symptoms & Severity
Hantavirus symptoms develop in three distinct phases after exposure.
The incubation period ranges from 1 to 5 weeks. Early recognition dramatically improves survival odds. The fatality rate for Hantavirus Pulmonary Syndrome is approximately 36%.
Days 1 to 5
Early Phase
Initial symptoms resemble a common flu: persistent fatigue, fever between 101 to 104°F, deep muscle aches particularly in the thighs, hips, and back. Headaches and dizziness are common. Most patients don't seek medical attention at this stage.
Days 4 to 10
Progressive Phase
The illness shifts from systemic to respiratory. A dry cough develops and worsens rapidly. Shortness of breath begins, first during activity, then at rest. Gastrointestinal symptoms appear: nausea, vomiting, and abdominal pain. This is the critical window for medical intervention.
Day 10+
Severe Phase
Fluid fills the lungs rapidly, causing acute respiratory distress. Without intensive care, specifically mechanical ventilation and careful fluid management, organ failure follows. The kidneys and cardiovascular system are most affected. Mortality in this phase is high.
How deadly is hantavirus?
36%
HPS fatality rate
1-5%
HFRS fatality rate
1-5 wk
Incubation period
Hantavirus Pulmonary Syndrome (HPS), found primarily in the Americas, is the more lethal form. Hemorrhagic Fever with Renal Syndrome (HFRS), predominant in Asia and Europe, is milder but still requires medical care. Early intervention with intensive respiratory support significantly improves survival outcomes.
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