Hantavirus is a serious infection that affects the lungs.

Virus Attacking a Cell
Virus
In a viral infection, the virus uses your cells to grow and reproduce, making you ill in the process.
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Hantavirus is caused by a virus. It is transmitted when a person comes into contact with rodents that are infected with the virus or infected rodents' urine or droppings. In the United States, the deer mouse is the rodent most likely to carry hantavirus infection. Hantavirus infection cannot be passed between humans.