A group of infectious diseases that involve bleeding, fever and kidney problems. Examples of viruses that can cause such infectious diseases include Hantan virus, Puumala virus and Seoul virus. Examples of diseases caused by viruses in this group includes epidemic nephritis, Hantaan fever and Songo fever. The virus is usually transmitted to human by rodents or biting insects such as mosquitos. The severity and range of symptoms is determined by the particular virus involved. See also Hemorragic fever with renal syndrome