25. What is the most common way humans become infected with hantaviruses?
From Quiz Hantaviruses
Answer:
Breathing in dust from rodent waste
Hantaviruses have some nasty habits, none nastier than hanging around rodent excreta. (We all have that one cousin or in-law, though, who's not quite right.) They hitch rides on rodents, particularly mice and rats, and exit the animal joyfully clinging to its urine, droppings, and saliva.
The most common way humans get infected is by breathing in tiny airborne particles contaminated with this waste. Rodent excreta dry out. When you're just minding your own business sweeping a floor, opening an old shed, or rummaging around under the sink, it disturbs the dried-out waste, and that can send microscopic virus particles drifting into the air, a very unwelcome cloud of fecal matter and harmful viruses.
This is why hantavirus infections very often pop up around places that have been closed up for a while. I'm talking about barns, storage sheds, hunting cabins, or that mysterious garage corner where the stuff your wife just can't bear to throw away goes to live out the rest of its life. If rodents have been using the place as a long-term bathroom, stirring up that dust can create a cloud of contaminated particles. If they hit your lungs, you could have a big problem.