Like being sick, but worse.
Hantavirus: A virus carried by rodents such as mice.
Infection is via breathing airborne particles of dried rodent urine or saliva found in infested areas.
The disease it causes is called hemorrhagic fever with renal syndrome (HFRS), from the Hantan River in Korea, where the virus was first isolated.
Symptoms are flu-like and take one to five weeks to appear. The disease has a fatality rate of 60 percent.