Analysis
Hantavirus exposure in the U.S. is overwhelmingly about breathing aerosolized dust from rodent urine, droppings, and nesting material. Pathway-by-pathway thinking — what people actually do that produces virus in the air — is the most useful frame for prevention.
Key facts
Breathing in particles from contaminated dust is the dominant route. The risk is not the rodent itself — it is the dust that gets stirred up when contaminated material is disturbed.
Aerosol dominates, but other routes are recognized.
U.S. hantaviruses (such as Sin Nombre) are not known to spread person-to-person. They are not associated with mosquito or tick transmission. Andes virus in South America is the one exception, with documented but rare person-to-person spread.
Cases repeatedly cluster around specific physical environments.
The activity is the trigger, not the location alone. Cleaning out a cabin without ventilation, vacuuming droppings, or disturbing nests are the activities that turn baseline rodent presence into measurable exposure.
Every cleanup recommendation on the prevention page is engineered to keep contaminated material out of the air: wet methods, soak times, paper towels, sealed bags, ventilation before entry, and PPE during the work itself.
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Primary Sources