sn-virusIn June 2012, three men removing slag from a derelict copper mine in southwestern China fell ill with severe pneumonia and died. Six months later, researchers went spelunking in the mine—an artificial cave hewn from a hillside—in search of pathogens. After taking anal swabs from bats, rats, and musk shrews living in the cave, the team has discovered what it says is a new virus that may have felled the workers. The presumed pathogen resembles a genus of viruses known as henipaviruses, two of which are deadly: Hendra virus, discovered 20 years ago in Australia when it started killing horses—since then, four people who came in contact with infected horses have died—and Nipah virus, the cause of periodic outbreaks in people in Southeast Asia since 1998. The third confirmed henipavirus, Cedar virus, was first reported in Australia in 2012; it does not appear to infect humans. For all three species, the animals that harbor the virus in the wild—the natural reservoir—appear to be fruit-eating bats called flying foxes. MORE