Andes virus

Andes virus is a pathogenic hantavirus first discovered in 1996 in the southern Andes Mountains of Argentina and Chile. It belongs to the Bunyaviridae family and is primarily transmitted to humans through contact with infected rodent droppings, urine, or saliva, particularly from the long-tailed pygmy rice rat. The virus causes hantavirus pulmonary syndrome (HPS), a severe and often fatal respiratory illness characterized by fever, muscle aches, and progressive lung failure. Unlike some other hantaviruses, Andes virus is notable for being the only known hantavirus capable of human-to-human transmission, though such cases remain rare.

Andes virus appears prominently in virology, epidemiology, and public health research, with particular significance in South American countries where rodent populations serve as natural reservoirs. The virus matters because outbreaks of HPS carry mortality rates around 40 percent, making it a serious emerging infectious disease threat. Its unique ability to spread between infected people distinguishes it from other hantaviruses and presents distinct epidemiological challenges for disease control and prevention efforts.

The virus works by infecting the cells lining blood vessels in the lungs, causing them to become leaky and filled with fluid—similar to how a damaged water pipe floods surrounding areas. Once inside human cells, the viral RNA hijacks the cell's machinery to produce new virus copies, which accumulate and trigger a severe immune response. This inflammatory cascade leads to pulmonary edema (fluid in the lungs) that prevents oxygen from entering the bloodstream, ultimately causing respiratory failure in untreated cases.

Andes virus is significant for contemporary research because understanding its human-to-human transmission mechanism could illuminate how other zoonotic viruses might evolve similar capabilities, with implications for pandemic preparedness. Current research focuses on developing antiviral treatments and vaccines, as well as improving surveillance in endemic regions to detect outbreaks early. The virus exemplifies how emerging infectious diseases can jump species barriers and establish new transmission routes, underscoring the importance of monitoring rodent populations and improving biosafety practices in affected communities.