The novel coronavirus SARS-CoV-2 is the latest pathogen to “spill over” from animals to people, but hundreds of thousands of other viruses lurking in animals could pose a similar threat. Now, a new online tool ranks viruses by their potential to hop from animals to people and cause pandemics.The tool, called SpillOver, essentially creates a “watch list” of newly discovered animal viruses that pose the greatest threat to human health. The researchers hope their open-access tool can be used by other scientists, policymakers and public health officials to prioritize viruses for further study, surveillance and risk-reducing activities, such as possibly developing vaccines or therapeutics before a disease spills over.”SARS-CoV-2 is just one example of many thousands of viruses out there that have the potential to spill over from animals to humans,” Zoë Grange, who led the development of SpillOver as a postdoctoral researcher with the One Health Institute at the University of California, Davis (UC Davis), said in a statement. “We need to not only identify, but also prioritize, viral threats with the greatest spillover risk before another devastating pandemic happens.”11 (SOMETIMES) DEADLY DISEASES THAT HOPPED ACROSS SPECIESSpillover risk Some 250 viruses are known to be “zoonotic,” meaning they have already spilled over


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