Merriam-Webster Collegiate Dictionary - hantavirus

 noun  Etymology: New Latin, from hanta- (from Hantaan, river in South Korea near where rodents carrying the virus were collected 1974-78) + virus  Date: 1984 any of a genus (Hantavirus of the family Bunyaviridae) of single-stranded RNA viruses transmitted especially by rodent feces and urine and including viruses causing serious pulmonary disease or hemorrhagic fevers marked by renal necrosis