 "Andes orthohantavirus" was first identified when outbreaks of this new infection spread throughout Chile and Argentina.In 1995, it was finally characterized in Argentina on the basis of specimens from a patient who had died from HPS complications, a severe consequence of infection from Andes viruses.As an emerging virus, it is more lethal than that of some of the other hantaviruses having a mortality rate between 40% and 50% in South America.