Hantaviruses are single-stranded, enveloped, negative sense RNA viruses in the Bunyaviridae family which can kill humans. It is also known as Korean hemorrhagic fever, epidemic hemorrhagic fever, and nephropathis epidemica. The species that cause HFRS include Hantaan River, Dobrava-Belgrade, Saaremaa, Seoul, and Puumala. It is found in Europe, Asia, and Africa.