Where is the risk of exposure to Hantavirus greatest?

• A. In closed spaces where rodents are actively living
• B. In open fields far from buildings
• C. In urban centers with no rodents
• D. In sunny exterior areas

Answer: (A)

Hantavirus exposure risk is highest when you inhale dust that contains rodent urine, droppings, or nesting material. Closed spaces where rodents are actively living fit this scenario best because contaminated dust can accumulate and become aerosolized, especially during sweeping, cleaning, or disturbing debris. In open fields far from buildings, or in urban areas with no rodents, there’s little of that contaminated dust to inhale, and sunny exterior areas typically have better ventilation and fewer dense rodent accumulations. So the greatest risk comes from enclosed spaces with active rodent activity, where contaminated dust can be inhaled more readily. If you must enter such spaces, use proper precautions to minimize inhalation of dust.