A Virus With Many Local Faces
Hantaviruses are not a single global threat but a patchwork of regional dangers, each tied to specific rodent hosts and landscapes. From the forests of Scandinavia to the pampas of Argentina, different viral strains have carved out their own territories.
Asia: The Classic Heartland of HFRS
In mainland China, Hong Kong, the Korean Peninsula, and Russia, hantaviruses are best known for causing hemorrhagic fever with renal syndrome (HFRS). Key culprits include Hantaan, Puumala, and Seoul viruses.
During the Korean War (1951–1954), more than 3,000 United Nations soldiers fell ill with HFRS, thrusting the disease into global awareness. Later, in 1976, the Hantaan virus — the first pathogenic hantavirus ever isolated — was discovered near the Hantan River in South Korea.
Europe: Mild and Severe Strains Side by Side
Across Europe, Puumala and Dobrava-Belgrade viruses dominate. Puumala typically causes nephropathia epidemica, a generally milder HFRS that presents with fever, headache, gastrointestinal upset, blurred vision, and impaired kidney function.
Dobrava infections look similar but often come with more pronounced hemorrhagic complications. Each Dobrava genotype is linked to a particular rodent: the yellow-necked mouse carries the Dobrava genotype, while variants like Saaremaa, Kurkino, and Sochi track with different species of field mice.
Even within a single country, the burden can be substantial. In Germany, the Robert Koch Institute recorded 1,713 hantavirus infections in 2017 alone.
The Americas: The Realm of HPS
In North and South America, hantavirus is most feared as the cause of hantavirus pulmonary syndrome (HPS). In Canada, the Sin Nombre virus carried by deer mice is the primary threat; between 1989 and 2014, 109 cases were confirmed, with a 29% death rate, mostly in western provinces.
In the United States, 728 cases were reported between 1995 and early 2017, spread across 36 states. Over 96% occurred west of the Mississippi River, with New Mexico, Colorado, and Arizona among the hardest-hit. About 36% of U.S. cases have been fatal.
In South America, the cast of viral characters becomes even more complex. The Andes virus — under various local names such as Oran, Juquitiba, and Araraquara — stands out as both a major cause of HPS and the only hantavirus proven to spread from person to person. The Laguna Negra virus, closely related to the Rio Mamore virus, is another notable agent. Rodents like Abrothrix longipilis and Oligoryzomys longicaudatus serve as their reservoirs.
Africa and Australia: Emerging and Silent Frontiers
In Africa, a novel virus named Sangassou was isolated in 2010 and shown to cause HFRS, hinting that the continent’s hantavirus story is just beginning to be written.
In Australia, as of 2005, there were no human infections reported, though rodents carrying antibodies suggest that hantaviruses are present and watching from the wings.
A Moving Target
Taken together, hantavirus infections have been reported on every continent except Australia in humans. Each regional strain, each rodent host, and each human outbreak is a reminder that this is a family of viruses finely tuned to local ecologies — and that our interaction with those environments can quickly turn a distant threat into a personal one.