Hantavirus has been infecting humans for far longer than scientists have known about it. The Korean War of the early 1950s saw thousands of soldiers develop a mysterious hemorrhagic fever — later attributed to Hantaan virus — that killed hundreds. But it was not until 1993 that hantavirus entered the Western public consciousness, following a dramatic and initially baffling cluster of deaths in the American Southwest.
Here is a documented history of the major outbreaks and what each one taught the scientific community about this family of viruses.
More than 3,000 United Nations soldiers fighting in Korea developed severe hemorrhagic fever with renal complications. The disease was called Korean hemorrhagic fever at the time. No causative agent was identified until 1976, when South Korean virologist Ho Wang Lee isolated the virus from the striped field mouse (Apodemus agrarius) near the Hantan River — giving the virus family its name. This was the first scientifically documented hantavirus.
A cluster of previously healthy young adults in the Four Corners region of the American Southwest — where New Mexico, Arizona, Colorado, and Utah meet — began dying of an acute, unexplained respiratory illness. By the time CDC investigators identified the cause, 13 of the first 24 confirmed patients had died. A previously unknown hantavirus, initially called "Muerto Canyon virus" and later renamed Sin Nombre virus, was identified as the cause. Its reservoir was confirmed to be the deer mouse (Peromyscus maniculatus), which had undergone a population explosion following an unusually wet winter. This outbreak established Hantavirus Pulmonary Syndrome as a distinct clinical entity and launched the modern era of hantavirus research.
A cluster of 20 cases of HPS in El Bolsón, a town in Argentine Patagonia, produced the first credible evidence that a hantavirus could spread between people. Epidemiological investigation revealed that a physician who treated patients in this cluster — and had no known rodent exposure — became ill and died. His partner, also without rodent exposure, subsequently developed HPS and survived. The Andes virus was identified as the causative strain, and this outbreak permanently changed how public health authorities approach hantavirus contact management.
Ten visitors to Yosemite National Park developed Sin Nombre hantavirus infection after staying in "Signature Tent Cabins" in the Curry Village area of the park. Three died. Investigation revealed that deer mice had become established inside the double-walled tent structures. This outbreak received significant international attention because thousands of visitors from multiple countries had stayed in the same cabins, requiring a large-scale notification effort coordinated across more than 10 nations. No secondary cases were identified outside the campsite exposure.
A Chinese man died of Seoul virus infection after a flight from Shandong province, prompting screening of fellow passengers. Seoul virus, carried by the common brown rat (Rattus norvegicus) worldwide, causes hemorrhagic fever with renal syndrome rather than pulmonary syndrome and has a much lower fatality rate than Andes or Sin Nombre virus. The incident highlighted the potential for hantavirus cases to generate international concern in an era of mass air travel, even when direct transmission between passengers was not a factor.
Betsy Arakawa, wife of actor Gene Hackman, died of Sin Nombre hantavirus infection in New Mexico. The case attracted global media attention and served as a reminder that hantavirus remains an ongoing public health concern in the American Southwest, not a historical curiosity. The New Mexico Department of Health confirmed the diagnosis following autopsy.
The MV Hondius outbreak is, by several measures, the most internationally complex hantavirus event ever recorded. Beginning with a single index case who most likely contracted Andes virus before boarding in Ushuaia, Argentina, the outbreak spread to 9 confirmed and 2 probable cases across 7 countries, resulting in 3 deaths. The unique feature of this outbreak — beyond its maritime setting — was the speed and scale of international contact tracing required after 147 passengers and crew disembarked in 22 countries following the ship's arrival in Tenerife on 10 May 2026.